Page 1 Q Corresponding MELSECNET/H Network System Reference Manual (Remote I/O network) QJ71LP21 Mitsubishi Programmable QJ71LP21-25 QJ72LP25-25 Logic Controller QJ71LP21G QJ72LP25G QJ71LP21GE QJ72LP25GE QJ71BR11 QJ72BR15...
Page 3: Safety Precautions
• SAFETY PRECAUTIONS • (Always read these instructions before using this equipment.) Before using this product, please read this manual and the relevant manuals introduced in this manual carefully and pay full attention to safety to handle the product correctly. The instructions given in this manual are concerned with this product.
Page 4 [Design Precautions] DANGER • When performing control operations to a PLC (modifying data) in operation by connecting GX Developer to the CPU module or connecting personal computers to the intelligent functional modules, configure an interlocking circuit in a sequence program so that the safety of the overall system is maintained.
Page 5 [Installation Precautions] CAUTION • Do not directly touch the conducting parts and electronic parts of the module. This may cause the module to malfunction or fail. [Wiring Precautions] DANGER • Before starting wiring or similar work, be sure to shut off all phases of the external power supply to the entire system.
Page 6 [Setup and Maintenance Precautions] CAUTION • Please read this manual thoroughly and confirm the safety enough before starting online operations (especially, program modifications, forced outputs, and operating status modifications), which are performed by connecting GX Developer via the MELSECNET/H network system to a CPU module running on another station. Performing incorrect online operations may damage the machinery or result in accidents.
Page 7: Revisions
REVISIONS The manual number is given on the bottom left of the back cover. Print Date Manual Number Revision Oct., 2000 SH (NA) -080124-A First printing May., 2001 SH (NA) -080124-B Model addition QJ71LP21G, QJ72LP25G, QJ71LP21GE, QJ72LP25GE Correction Product Components, About The Generic Terms And Abbreviations, Chapter 1, Section 1.2, 2.4, 3.1.1, 3.1.2, 3.2.1, 3.2.2, 3.3.2, 4.2.1, 4.2.2, 4.8.2, Chapter 5, Section 5.1.5, 5.2.1, 6.1.2, 6.2.1, 6.3, 6.4, 7.1.1, 7.8, 8.1, 8.1.1, 8.1.4, 8.3.1, 8.3.2, Appendix 2, 3, 4, 5, Index...
Page 8 This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent licenses. Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may occur as a result of using the contents noted in this manual.
Page 9: Table Of Contents
INTRODUCTION Thank you for purchasing the MELSEC-Q series PLC. Before using the equipment, please read this manual carefully to develop full familiarity with the functions and performance of the Q series PLC you have purchased, so as to ensure correct use. Please forward a copy of this manual to the end user.
Page 10 4.1 Procedures Before Starting the Operation..................... 4- 1 4.2 Network Module Names and Settings....................4- 2 4.2.1 QJ71LP21, QJ71LP21-25, QJ71LP21G, QJ71LP21GE, QJ71BR11 (Remote master station) ... 4- 2 4.2.2 QJ72LP25-25, QJ72LP25G, QJ72LP25GE, QJ72BR15 ............... 4- 5 4.3 Installing and Uninstalling the Module....................4- 7 4.4 Stopping the CPU (Unintentional Output Prevention) ................
Page 11 4.10.3 Station order check test (optical loop system only)............... 4-26 4.10.4 Communication test ........................4-27 5 PARAMETER SETTINGS 5- 1 to 5-30 5.1 Remote Master Station Parameter Setting .................... 5- 5 5.1.1 Setting the number of module cards (Network type) ..............5- 5 5.1.2 Network settings..........................
Page 12 7.6 Reserved Station Function ........................7-17 7.7 Interrupt Settings............................. 7-18 7.8 I/O Assignment Function ........................7-19 7.9 Stopping/Restarting the Cyclic Transmission and Stopping Link Refreshing (Network Test) ..... 7-20 7.10 Multiplexed remote master function (QnPHCPU only) ................ 7-21 7.11 Multiplexed remote master function for redundant system (QnPRHCPU only)........7-36 7.11.1 Backup function of master operation on system switching between control system and standby system ..........................
Page 13: Manuals
Manuals The following manuals are also related to this product. In necessary, order them by quoting the details in the tables below. Related Manuals Manual Number Manual Name (Model Code) Q Corresponding MELSECNET/H Network System Reference Manual (PLC to PLC network) SH-080049 This manual describes the specifications for a MELSECNET/H network system for PLC to PLC network.
Page 14: Generic Terms And Abbreviations
Generic Terms And Abbreviations Generic term/abbreviation Description of generic term/abbreviation This is an abbreviation for a QJ71LP21, QJ71LP21-25, QJ71LP21S-25, QJ71LP21G, QJ71LP21GE QJ71LP21 MELSECNET/H network module. However, especially in cases to show different models, QJ71LP21, QJ71LP21-25, QJ71LP21S-25, QJ71LP21G and QJ71LP21GE are printed.
Page 15: Overview
Network system Communication speed Optical loop 25 Mbps MELSECNET/H Optical loop, coaxial cable 10 Mbps 1: QJ71LP21-25, QJ71LP21S-25, QJ72LP25-25 only Control station (MELSECNET/10 mode) Remote master station QCPU Control station (MELSECNET/H mode) GX Developer QCPU normal station QCPU normal station...
Page 16: Features
(1) Achievement of a high-speed communication system High-speed data sending at a communication rate of 10 Mbps/25 Mbps is possible. (25Mbps is available for only the optical loop type QJ71LP21-25, QJ71LP21S-25 and QJ72LP25-25.) (2) Large-scale and flexible system configuration The link device has a larger capacity: 16384 points for the link relay (LB) and 16384 points for the link register (LW).
Page 17 1 OVERVIEW MELSEC-Q It is not necessary to designate reserved stations which are treated as stations to be connected in future or to connect stations in the order of station numbers. The optical loop system executes a loopback when a station is down.
Page 18 1 OVERVIEW MELSEC-Q The redundant system uses the multiplex remote master function to control I/O modules and intelligent function modules. (The QnPRHCPU should be used in the redundant system.) If the multiplexed master station (control system) fails, the multiplex remote master function will switch the master station from "control system"...
Page 19 1 OVERVIEW MELSEC-Q (3) Providing versatile communication service Reading and writing of data for an intelligent function module that has been mounted to a remote I/O station can be easily performed. There are four methods available for reading and writing. Use GX Configurator to make the initial settings and automatic refresh settings in the intelligent function module parameters, and write them into the remote I/O module in the remote I/O station.
Page 20 1 OVERVIEW MELSEC-Q By refreshing the intelligent function module data into the remote I/O module's data register D by the automatic refresh setting of the intelligent function module parameters, the remote master station can read/write data from/to the data register D with READ or WRITE instruction.
Page 21 1 OVERVIEW MELSEC-Q (4) Enhanced RAS functions (Refer to Section 3.2.2 "RAS functions") (a) When a faulty station recovers and can resume normal operation, it automatically returns to the network to resume the data communication using the automatic return function. By using the loopback function (the optical loop system), it is possible to continue data transmission among operational stations by disconnecting faulty areas such as a part of the network where there is a cable...
Page 22 1 OVERVIEW MELSEC-Q (6) Strengthening network functions Intelligent function modules mounted to remote I/O stations can be diagnosed using the GX Developer system monitor. Intelligent function modules mounted to remote I/O stations can be diagnosed using the system monitor even if it is done via the network using a GX Developer connected to a remote master station or even if the GX Developer is directly connected to a remote I/O station.
Page 23: Abbreviations Used In The Text, Tables And Diagrams Of This Manual
1 OVERVIEW MELSEC-Q 1.3 Abbreviations Used in the Text, Tables and Diagrams of This Manual (1) Abbreviations Abbreviations Name Remote master station Remote I/O station Multiplexed remote master Multiplexed remote sub-master (2) Marking format Station number (1 to 64) Abbreviation Network No.
Page 24: System Configuration
2 SYSTEM CONFIGURATION MELSEC-Q 2 SYSTEM CONFIGURATION This introduces a system comprised of remote I/O networks. 2.1 Single Remote I/O Networks 2.1.1 Configuration (1) Optical loop system Up to 64 remote I/O modules can be connected to a remote master station. Always set the station number of the remote master station to 0.
Page 25: Setting Items
2 SYSTEM CONFIGURATION MELSEC-Q 2.1.2 Setting items Table 2.1 shows the setting items on the master module of the remote master station (MR) and the parameter setting items on GX Developer. Table 2.1 Remote master station setting items Setting items Remote master station (M Reference Network module switch...
Page 26: Available Device Ranges
2 SYSTEM CONFIGURATION MELSEC-Q Table 2.2 shows the setting items on the remote I/O module of the remote I/O station (R) and the parameter setting items on the GX Developer. Table 2.2 Remote I/O station setting items Setting items Remote I/O station (R) Reference Network module switch STATION NO.
Page 27: Multiple Remote I/O Network (Qnphcpu Only)
2 SYSTEM CONFIGURATION MELSEC-Q 2.2 Multiple Remote I/O Network (QnPHCPU Only) 2.2.1 Configuration A multiplexed remote I/O network system includes a multiplexed remote master station and a multiplexed remote sub-master station. The multiplexed remote sub-master station takes control of remote I/O stations when the multiplexed remote master station fails.
Page 28: Setting Items
2 SYSTEM CONFIGURATION MELSEC-Q 2.2.2 Setting items Table 2.3 lists the parameter setting items of the multiplexed remote master station (DM ) and multiplexed remote sub-master station (DSM Table 2.3 Setting Items of Multiplexed Remote Master Station and Multiplexed Remote Sub-Master Station Multiplexed remote Multiplexed remote Setting item...
Page 29: Available Device Ranges
2 SYSTEM CONFIGURATION MELSEC-Q Table 2.4 lists the setting items can be set on a remote I/O module operating as a remote I/O station (R) and the parameter setting items can be set from GX Developer. Table 2.4 Setting Items of Remote I/O Station Reference Setting item Remote I/O station (R)
Page 30: Multiplexed Remote I/O Network For Redundant System (Qnprhcpu Only)
2 SYSTEM CONFIGURATION MELSEC-Q 2.3 Multiplexed Remote I/O Network for Redundant System (QnPRHCPU Only) 2.3.1 Configuration The redundant system including QnPRHCPU utilizes the multiplexed remote I/O network system in order to control I/O modules and intelligent function modules. In the multiplexed remote I/O network system for the redundant system, the network module on the side of the control QnPRHCPU (started up as a control system) acts as a multiplexed remote master station and controls remote I/O stations, while the network module mounted on the side of the standby QnPRHCPU performs the sub-...
Page 31: Setting Items
2 SYSTEM CONFIGURATION MELSEC-Q 2.3.2 Setting items Table 2.5 indicates the parameter setting items of the multiplexed remote master station (DM ) and multiplexed remote sub-master station (DSM In the redundant system, the same network parameters are set to both the control and standby systems.
Page 32: Available Device Ranges
2 SYSTEM CONFIGURATION MELSEC-Q Table 2.6 lists the setting items on the remote I/O module, parameter setting items on GX Developer and intelligent function module parameter setting items on GX Configurator. Table 2.6 Setting Items of Remote I/O Station Setting item Remote I/O station (R) Reference Network module main module switch...
Page 33: Multiple Remote I/O Network
2 SYSTEM CONFIGURATION MELSEC-Q 2.4 Multiple Remote I/O Network 2.4.1 Configuration A multiple remote I/O network system is a network system with many networks connected to it. Set so that a network number will not duplicate another. If there are no duplications, setting can be anywhere within a range from 1 to 239.
Page 34: Available Device Ranges
2 SYSTEM CONFIGURATION MELSEC-Q Table 2.8 shows the setting items for the remote I/O module main module for the remote I/O station (R) and the parameter setting items from the GX Developer. Table 2.8 Remote I/O station setting items Setting items Remote I/O station (R) Reference Network module main module switch...
Page 35: Precautions When Configuring The System
1 : Use a CPU module with the first 5 digits of the serial No. 02092 or later. Applicable function version Network module Multiplexed remote I/O network Multiplexed remote I/O network for redundant system 2 or remote I/O network QJ71LP21 QJ71LP21-25 Master module QJ71LP21S-25 QJ71LP21G Function version D or later Function version B or later...
Page 36 Q61SP is applicable to Q3 SB. QC05B, QC06B, QC12B, QC30B, QC50B, • Overall extension cable length: 13.2m or less QC100B QI60, QJ71LP21, QJ71LP21-25, QJ71LP21S- 25, QJ71LP21G, QJ71LP21GE, QJ71BR11, QJ71WS96 • Function version B or later is available. QJ71E71-B5, QJ71E71-B2, QJ71E71-100 •...
Page 37 2 SYSTEM CONFIGURATION MELSEC-Q 7 : Note the following points when using extension cables. 1) Do not install extension cables together with the main circuit (high voltage, large current) cables. 2) Connect an extension cable from OUT of the extension cable connector of the base unit to IN of the next extension base unit.
Page 38: When Using A Multiple Cpu System
2 SYSTEM CONFIGURATION MELSEC-Q 2.6 When Using a Multiple CPU System Take the following points into consideration when configuring a remote I/O network by utilizing multiple CPU system. Use the master module of function version B or later. Set the network parameters to the control CPU controlling the master module. It is possible to set up to four master modules per control CPU.
Page 39 2 SYSTEM CONFIGURATION MELSEC-Q By connecting to a remote I/O station for access to other stations, GX Developer can access stations in the other network system, whether the relay stations in the multiple CPU system are controlled by the same or different CPUs. Also, GX Developer can access either the control CPU or non-control CPU in the multiple CPU system.
Page 40: Checking Function Version And Serial No
2 SYSTEM CONFIGURATION MELSEC-Q 2.7 Checking Function Version and Serial No. The following describes how to check the function version and serial No. of the network module. Checking the rating plate on the side of the module. The serial number of the module and function version number are shown in the "Serial"...
Page 41: Specifications
Table 3.1 shows the performance of the optical loop system. Table 3.1 Optical loop system performance specifications Remote master station Remote I/O station Item QJ71LP21 QJ71LP21G QJ71LP21GE QJ71LP21-25 QJ71LP21S-25 QJ72LP25-25 QJ72LP25G QJ72LP25GE LX/LY 8192 points Maximum 16384 points (Remote master station...
Page 42: Coaxial Cable System Performance Specifications
3 SPECIFICATIONS MELSEC-Q Remote master station Remote I/O station Item QJ71LP21 QJ71LP21G QJ71LP21GE QJ71LP21-25 QJ71LP21S-25 QJ72LP25-25 QJ72LP25G QJ72LP25GE 20.4 to 31.2 V Voltage — — Current 0.20 A — — Size of terminal M3 Screw External — — screw Power Suitable crimp R1.25-3...
Page 43: Optical Fiber Cable Specifications
Total cable loss = 7.5 dB or less Optical module 1: Conversion cable Conversion Type Cable CA type FC type AGE-1P-CA/FC1.5M-A CA type ST type AGE-1P-CA/ST1.5M-A CA type SMA type AGE-1P-CA/SMA1.5M-A Purchased from: Mitsubishi Electric Europe GmbH 3 - 3 3 - 3...
Page 44: Coaxial Cable Specifications
3 SPECIFICATIONS MELSEC-Q 3.1.4 Coaxial cable specifications The following table lists the specifications of the coaxial cables used for the coaxial bus system. The high frequency coaxial cable "3C-2V" or "5C-2V" (conforms to JIS 3501) is used. However, when configuring a multiplexed remote I/O network for redundant system, use a double shield coaxial cable.
Page 45 3 SPECIFICATIONS MELSEC-Q (2) Connecting the coaxial cable connectors The following section explains how to connect the BNC connector (the connector plug for the coaxial cable) to the cable. • Solder the coaxial cable connectors properly. Insufficient soldering may result in CAUTION malfunctions.
Page 46 3 SPECIFICATIONS MELSEC-Q Cut the external conductor, insulating material and internal conductor to the dimensions shown below. Note that the external conductor should be cut to the same dimension as the tapered section of the clamp and smoothed down to the clamp. Insulating material Internal conductor (0.12 in.)
Page 47: Function Specifications
3 SPECIFICATIONS MELSEC-Q 3.2 Function Specifications The following introduces the MELSECNET/H remote I/O network functions. This shows a list of the functions. Basic Cyclic transmission function Communicating with input/output module · · · · · · · · · · · · · · · · · · · · · · · · Section 3.2.1 (1) functions (Periodic communication)
Page 48: Cyclic Transmission Function (Periodic Communication)
3 SPECIFICATIONS MELSEC-Q 3.2.1 Cyclic transmission function (Periodic communication) The cyclic transmission function periodically exchanges data between the remote master station and remote I/O station using link device (LX/LY/LB/LW) The following explains the differences between when the module connected to the remote I/O station is an input/output module and when it is an intelligent module connected to it.
Page 49: Communicating With Intelligent Function Module
3 SPECIFICATIONS MELSEC-Q (2) Communicating with intelligent function module The remote master station can communicate with the intelligent function module mounted to the remote I/O station in the following four ways. Methods for communicating with the intelligent module Features When the intelligent function module is mounted to a By cyclic transmission (common parameters) + nearby slot of the CPU module, the same kind of intelligent function module parameters...
Page 50 3 SPECIFICATIONS MELSEC-Q The CPU uses the X/Y(LX/LY) and B/W(LB/LW)devices set by the common parameters and the automatic refresh settings for the intelligent function module parameters that where written in the remote I/O station to periodically read and write intelligent function module data. The intelligent function module parameters are created by GX Configurator.
Page 51 3 SPECIFICATIONS MELSEC-Q QCPU follows the refresh parameters and refreshes link register W between QCPU and the master module. [Input/output] X/Y(LX/LY) is the same as communication with input/output module. QCPU uses the dedicated link instructions (REMFR/REMTO instructions) for directly writing to the buffer memory of the intelligent function module for the remote I/O station for reading and writing data.
Page 52 3 SPECIFICATIONS MELSEC-Q The CPU uses the X/Y(LX/LY) and B/W(LB/LW)devices set by the common parameters and the automatic refresh settings for the intelligent function module parameters that where written in the remote I/O station to periodically read and write intelligent function module data. The difference between this and (a) is that with the automatic refresh settings for the intelligent function module parameters, the automatic refresh destination of the intelligent function module is network module data...
Page 53 3 SPECIFICATIONS MELSEC-Q Link register W, follows the common parameters set in the remote master station for communication between the remote master station and the remote I/O station. Link register W between the master module and QCPU are refreshed. [Input/output] X/Y(LX/LY) is the same as communication with input/output module.
Page 54: Ras Functions
3 SPECIFICATIONS MELSEC-Q 3.2.2 RAS functions RAS stands for "Reliability", "Availability" and "Serviceability" and is an automated facility for overall ease of use. (1) Output reset function for communication errors Remote I/O net will set all output of remote I/O stations to off when there is a data link error.
Page 55: Loopback Function (Optical Loop System)
3 SPECIFICATIONS MELSEC-Q (3) Loopback function (optical loop system) In the optical loop system, the transmission path is dual-structured. When an error occurs in a transmission path, the faulty area is disconnected by switching the transmission path from the forward loop to the reverse loop or from the reverse loop to the forward loop, or performing a loopback.
Page 56 3 SPECIFICATIONS MELSEC-Q Precautions in using the optical loop system When the cable is inserted or removed, the line (forward loop/reverse loop) may be switched, but the data link will be performed normally. When the loopback is being executed due to a cable disconnection, both the forward and reverse loops may be recognized as normal depending on the condition of the cable disconnection.
Page 57: Station Detach Function (Coaxial Bus Systems)
3 SPECIFICATIONS MELSEC-Q REMARK If the network module has become faulty, a loopback may not be made depending on the fault. In that case, the network may stop. Identify the faulty network module in the following method. Check the LED indications (RUN LED off, ERR. LED on) of all network modules for a faulty station.
Page 58: Transient Transmission Enabled Even At Cpu Module Error
3 SPECIFICATIONS MELSEC-Q (5) Transient transmission enabled even at CPU module error By using this function, the network module can continue the transient transmission even if an error that stops the CPU module occurs while the system is operating. The description of the error of the corresponding station can be checked from other stations using GX Developer.
Page 59 3 SPECIFICATIONS MELSEC-Q (6) Checking the transient transmission abnormal detection time By using this function, the "Time," "Abnormal detection network number," and "Abnormal detection station number" can be checked when a transient transmission (READ, WRITE and other instructions) ends abnormally. The time log can be used to identify the network problems and to determine how the network can be improved.
Page 60: Diagnostic Functions
3 SPECIFICATIONS MELSEC-Q (7) Diagnostic function The diagnostic function is used to check the network's line status and the module setting status. The diagnostic function consists mainly of following two types of tests: • Offline tests • Online tests POINT Execute the online tests when the network module is communicating (T.PASS LED is on).
Page 61 3 SPECIFICATIONS MELSEC-Q (8) Configuration of redundant power supply on a remote I/O station A redundant power supply can be configured on a remote I/O station by mounting a pair of power supply modules onto the dedicated base unit. A redundant power supply offers the following advantages. The remote I/O station can continue the operation after either power supply module stops power supply The remote I/O station with a redundant power supply can continue...
Page 62 3 SPECIFICATIONS MELSEC-Q POINT For the specifications of Q38RB/Q68RB Redundant power supply base unit and Q64RP redundant power supply module, refer to QCPU Module User's Manual (Hardware Design, Maintenance and Inspection). Modules needed to configure a redundant power supply in a remote I/O station To configure a redundant power supply in a remote I/O station, use the modules shown below.
Page 63 3 SPECIFICATIONS MELSEC-Q Precautions on configuring a redundant power supply If either of the power supply modules fails and it needs to be replaced in a remote I/O station including redundant power supply, replace the other power supply module as well, in order to prevent the potential accidents Also, it is recommended to replace power supply modules five years after the remote I/O station starts to run.
Page 64: Online Module Change In A Remote I/O Station
3 SPECIFICATIONS MELSEC-Q (9) Online module change on a remote I/O station Online module change is the function for replacing a Q series module mounted on the main base unit or extension base unit of a remote I/O station while the station is operating.
Page 65 3 SPECIFICATIONS MELSEC-Q GX Developer versions required for online module change on a remote I/O station To perform online module change, GX Developer Version 8.18U or later is required. In addition, online module change can also be performed from GX Developer via a network.
Page 66 3 SPECIFICATIONS MELSEC-Q Restrictions online module change operation The following operations cannot be performed while online module change is performed. Issue an online module change request from more than one GX Developer to a remote I/O module. Write parameters in the remote I/O module being replaced online. POINT If an online module change request is issued from other GX Developer to a remote I/O module being replaced online, the message below is displayed.
Page 67 3 SPECIFICATIONS MELSEC-Q If an error has occurred on the target remote I/O module, the module holds the error even after online module change is completed. Therefore, it is necessary to clear the error by clearing the error using SM50 and SD50 on the PLC CPUs of the remote I/O station and master station.
Page 68 3 SPECIFICATIONS MELSEC-Q Double-click the module to be replaced online to display the Online Module Change screen. (The table below indicates the communication status of the module to be replaced online when the screen below is displayed.) Target modules and items Execute/not execute Input module refreshing Execute...
Page 69 3 SPECIFICATIONS MELSEC-Q 11) Connect between the external device and module (I/O signal) by the switch and so on. 12) Mount the module, and then click the "Execute" button. (The table below indicates the communication status of the new module when the screen below is displayed.) Target modules and items Execute/not execute Input module refreshing...
Page 70: Link Data Send/Receive Processing Time Specifications
3 SPECIFICATIONS MELSEC-Q 3.3 Link Data Send/Receive Processing Time Specifications The following introduces the method of calculating link data send/receive and transmission delay time in the remote I/O network. 3.3.1 Link data send/receive processing (1) Summary of send/receive processing Cyclic transmission of the remote I/O network communicates by network module LX/LY/LB/LW.
Page 71 3 SPECIFICATIONS MELSEC-Q For intelligent function module The following provides an example of how the link device (W) on the CPU module side is sent to an intelligent function module. Data is sent to the remote master station W0. W0 data is stored in the network module refresh data storage area (LW) by link refresh.
Page 72 3 SPECIFICATIONS MELSEC-Q (2) Link refresh, link scan, I/O refresh and automatic refresh Link refresh of the remote master station is done in the END processing of the CPU module. Link scan is performed synchronously with the CPU module sequence scan. The I/O refresh and automatic refresh of the remote I/O station and performed "asynchronously"...
Page 73: Transmission Delay Time
3 SPECIFICATIONS MELSEC-Q (4) SB/SW when a communication error station/communication stop station occurs on the network The status of whether there are any communication error/communication stop stations on the network can be checked with the link special relay/register (SB/SW). Use them as interlocks for programs. Link special relays and registers Signal status Link special...
Page 74 3 SPECIFICATIONS MELSEC-Q (1) Remote master station remote I/O station Cyclic transmission (X/Y/W periodic communication) Transmission delay time of X/Y/W is the sum of the following. • Remote master station scan time (Except for the link refreshing time) • Remote master station link refresh time •...
Page 75 3 SPECIFICATIONS MELSEC-Q [Y transmission delay time (T [Remote master station scan time (Sm) > link scan time (LS)] = (Sm + αm) + LS + T [ms] RIOR Remote station sets Y 0: 0 step to on near 0 step. E: END step αm αm...
Page 76 3 SPECIFICATIONS MELSEC-Q [W input transmission delay time (T [Remote master station scan time (Sm) > link scan time (LS)] = (Sm + αm) 2 + Sm + T [ms] MOV W0 D0 αm αm αm αm αm Remote master station Link scan time 0: 0 step Remote I/O station...
Page 77 3 SPECIFICATIONS MELSEC-Q [W output transmission delay time (T [Remote master station scan time (Sm) > link scan time (LS)] = (Sm + αm) + LS + T [ms] 0: 0 step MOV D100 W100 E: END step αm αm αm αm αm...
Page 78 3 SPECIFICATIONS MELSEC-Q REMFR/REMTO/READ/WRITE instructions REMFR/REMTO/READ/WRITE instructions transmission delay time is the sum of the following. • Remote master station scan time (Except for the link refreshing time) • Remote master station refresh time • Link scan time Calculate the sum as shown below: [Instruction transmission delay time (M [Remote master station scan time (Sm) >...
Page 79 3 SPECIFICATIONS MELSEC-Q (2) Multiplexed remote master station multiplexed remote sub- master station (a) Cyclic transmission (LB/LW/LX/LY periodic communication) The transmission delay time of B/W/Y communication is the sum of the following: • Scan times of multiplexed remote master station and multiplexed remote sub-master station (Except for the link refreshing time) •...
Page 80 3 SPECIFICATIONS MELSEC-Q (b) SEND/RECV/RECVS/READ/WRITE/REQ/ZNRD/ZNWR instruction communication The transmission delay time of instruction communication is the sum of the following: • Scan times of multiplexed remote master station and multiplexed remote sub-master station (Except for the link refreshing time) • Link refresh times of multiplexed remote master station and multiplexed remote sub-master station •...
Page 81 3 SPECIFICATIONS MELSEC-Q (3) Link refresh time The link refresh time (CPU module end processing time extension) is calculated as shown below. • Link device allotment points • Type of CPU used [Remote master station refresh time (αm)] α 16)} /16 + α = KM1 + KM2 {LB + LX + LY + SB + (LW 16) + (SW...
Page 82 3 SPECIFICATIONS MELSEC-Q (4) Link scan time Link scan time is based on a calculation of the following factors. • Link device allotment points • Number of stations connected [Link scan time] [Communication speed: 10 Mbps] LS = KB + (0.45 total number of stations) + {LX + LY + LB + (LW 16)} /8 0.001 + KR...
Page 83 3 SPECIFICATIONS MELSEC-Q (5) Refresh time with the remote I/O network module, input/output module and intelligent function module Refresh time with the remote I/O network module, input/output module and intelligent function module is according to the formula shown below. [Input/output module and refresh time] 0.0016 + X 0.0024 + Y 0.0014 + Y...
Page 84 3 SPECIFICATIONS MELSEC-Q (6) Transmission delay time formula The transmission delay time is calculated based on the following system design and conditions. (System design, conditions) CPU module:QO6HCPU Total number of remote I/O stations: 8 Number of link devices: LX = LY = 1024 points, LB = LW = 0 point, SB = SW = 512 points Remote master station CPU module scan time: 1 ms Communication speed: 10 Mbps...
Page 85: Switching Time From The Multiplexed Remote Master Station To The Multiplexed Remote Sub-Master Station In A Multiplexed Remote I/O Network
3 SPECIFICATIONS MELSEC-Q 3.3.3 Switching time from the multiplexed remote master station to the multiplexed remote sub-master station in a multiplexed remote I/O network In the multiplexed remote I/O network system, the multiplexed remote sub-master station takes over the control of the remote I/O station from of the multiplexed remote master station when it develops an error.
Page 86: Output Holding Time During System Switching In The Multiplexed Remote I/O Network For Redundant System
3 SPECIFICATIONS MELSEC-Q 3.3.4 Output holding time during system switching in the multiplexed remote I/O network for redundant system In the multiplexed remote I/O network for redundant system, if an error occurs in the multiplexed remote master station of the control system, the multiplexed remote sub- master station of the standby system takes over the control of remote I/O stations.
Page 87 3 SPECIFICATIONS MELSEC-Q CPU system switching time > Switching time from the multiplexed remote master station to the multiplexed remote sub-master station A power down has occurred on the control system Scan Control system standby system CPU Standby system control system CPU Output holding time of remote I/O station [Output holding time (Toh)] Toh = Tsw + (Scan...
Page 88 3 SPECIFICATIONS MELSEC-Q (2) System switching when a system switching dedicated instruction is executed, a system switching request is issued by GX Developer, or the link cable is disconnected on other network module Multiplexed remote master station (DM Multiplexed remote sub-master station (DSM Control system standby system Standby system...
Page 89 3 SPECIFICATIONS MELSEC-Q CPU system switching time > Switching time from the multiplexed remote master station to the multiplexed remote sub- master station System switching request from GX Developer Scan Control system standby system CPU Standby system control system CPU Output holding time of remote I/O station [Output holding time (Toh)] Toh = Tsw + Scan [ms]...
Page 90 3 SPECIFICATIONS MELSEC-Q (3) System switching when the link cable disconnection occurs in the host network module If a communication error occurs due to link cable disconnection on the host network module, it will considerably increase "data link monitoring time + switching monitoring time".
Page 91: Setup And Procedures Before Starting The Operation
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION This chapter explains the procedures, settings, connections and testing that are required to start the data link operation. 4.1 Procedures Before Starting the Operation The following flowchart shows the procedures that are required to perform the data link operation: S ta rt...
Page 92: Network Module Names And Settings
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.2 Network Module Names and Settings 4.2.1 QJ71LP21, QJ71LP21-25, QJ71LP21G, QJ71LP21GE, QJ71BR11 (Remote master station) 2) STATION No. (factory default setting: 1): Optical loop module Station number setting switch QJ71LP21-25 This switch sets the station number on the same network.
Page 93 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 1) LED displays Name LED status Description Green on Module operating normally WDT error occurred (hardware error) Green on Operating as a remote master station Not operating as a remote master station T.PASS Green on Executing baton pass (being joined in a network)
Page 94 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q (1) Station No. settings on a multiplexed remote I/O network for redundant system For the network module mounted on the station (multiplexed remote master station) to which the system A connector of tracking cable is connected, set the station No.0.
Page 95: Qj72Lp25-25, Qj72Lp25G, Qj72Lp25Ge, Qj72Br15
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.2.2 QJ72LP25-25, QJ72LP25G, QJ72LP25GE, QJ72BR15 2) ReS-232 connector For connecting RS-232 connector for peripheral equipment QJ72LP25-25 3) STATION No. (Factory setting:1) : Station setting switch REM. T.PASS D.LINK 1) LED indicator Station numbers can be set inside the same network.
Page 96 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 1) LED displays Name LED status Description Green on Module operating normally WDT error occurred (hardware error) 2 REM. Green on Module operating normally. Green flashing Parameters being written to flash ROM or device is in test mode. In remote initialization, error (WDT error, blown fuse error, input/output verification error, etc.) T.PASS Green on...
Page 97: Installing And Uninstalling The Module
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.3 Installing and Uninstalling the Module (1) Installing the module 1) Insert the module mounting latch on the bottom of the module properly into the module mounting hole of the base unit. 2) Push the module in the direction of the arrow using the module installation hole as a supporting point until the module’s hook is fixed to the guide of the base unit.
Page 98: Stopping The Cpu (Unintentional Output Prevention)
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.4 Stopping the CPU (Unintentional Output Prevention) Set the CPU module's RUN/STOP switch to the STOP side. STOP 4.5 Checking the Input Power Supply Voltage Check that the supply power voltage to the power supply module is within the specifications.
Page 99: Standalone Check Of The Network Module (Offline Tests)
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.7 Standalone Check of the Network Module (Offline Tests) Before executing the data link operation, check the network module and the cables. Select a test using the mode setting switch on the front of the network module. The following three test are available for the offline tests: (1) Self-loopback test (mode setting switch: 1 or 5) This test checks the hardware of the internal circuits, including the send/receive...
Page 100: Self-Loopback Test
This test checks the hardware of a standalone network module, including the send/receive circuit and cable of the transmission system. Connect the IN and OUT terminals of the QJ71LP21/QJ72LP25 network module (for the optical loop system) with an optical fiber cable.
Page 101: Internal Self-Loopback Test
This test checks the hardware of a standalone network module, including the send/receive circuit of the transmission system. Do not connect the optical fiber cable with the QJ71LP21/QJ72LP25 network module (for LPthe optical loop system). However, make sure that the exterior random light does not enter from the connector.
Page 102: Hardware Test
4.7.3 Hardware test This test checks the hardware inside the network module. Connect the IN and OUT terminals of the QJ71LP21/QJ72LP25 network module (for the optical loop system) with an optical fiber cable. Do not connect cables or terminal resistors if the QJ71BR11/ QJ72BR15 network module (for the coaxial bus system) is used.
Page 103: Cable Connections
Maintain the bending radius of the optical fiber cable within the allowable range using a tool for securing the optical fiber cable bending radius. This tool may be purchased from Mitsubishi Electric System Service, Inc, or your nearest dealer. Please inquire for more information.
Page 104 Stations do not have to be connected in the order of station numbers. Remote master station is set as station number 0. a - 1) QJ71LP21-25 - QJ72LP25-25, QJ71LP21G - QJ72LP25G Remote master station Remote I/O station Remote I/O station...
Page 105: Coaxial Bus System
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q Removing the optical fiber cable The following shows how to remove the optical fiber cable: Start (Removal) Plug Press the fixed sections of the plug in the directions of the arrows and pull out the plug.
Page 106 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q Cable installation precautions Install the coaxial cables at least 100 mm (3.94 in.) away from other power cables and control cables. Consider to use double-shielded coaxial cables in locations where there is excessive noise. To configure a multiplexed remote I/O network for redundant system, use a double-shielded coaxial cable.
Page 107 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q (2) Cable connection Connection method Connect the coaxial cable as shown below. Always install a terminal resistor (sold separately: A6RCON-R75) to the stations connected at both ends. The F-type connector comes with the module. Without a repeater module Remote master station Remote I/O station...
Page 108 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q With a repeater module (branch connection) Remote master station Remote I/O station Remote I/O station Station No. 0 Station No. 1 Station No. 2 QJ71BR11 QJ72BR15 QJ72BR15 F-type connector F-type connector F-type connector T-type connector (A6BR10 accessory)
Page 109 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q Installing the coaxial cable The following shows how to install the coaxial cable: Link module Start (Installation) Jack Insert the plug by aligning the groove of Plug the plug with the projection of the jack. Projection Groove Rotate the plug in the direction of the...
Page 110: Offline Tests From Gx Developer
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.9 Offline Tests from GX Developer The offline tests check the cable connection status using the network parameters of GX Developer. 4.9.1 Forward loop/reverse loop test (Remote master station only) The forward loop/reverse loop test checks the hardware of the network modules and cables after all stations are connected with optical fiber cables.
Page 111 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q Setting the mode when performing the forward loop/reverse loop test on the redundant system When conducting the forward loop/reverse loop test on the redundant system, set the operation mode of the redundant CPU to the backup mode in advance.
Page 112 4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q (2) Starting the test Set the STOP/RUN switch of the CPU module to STOP position. When resetting the CPU module, use the RESET/L.CLR switch. Perform this operation on the station to be tested first, then on the station to execute the test.
Page 113: Network Diagnostics From Gx Developer (Online Tests)
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.10 Network Diagnostics from GX Developer (Online Test) With the network diagnostic function of GX Developer, the line status can easily be checked and diagnosed. Conduct network diagnostics by connecting GX Developer with a remote master station.
Page 114: Loop Test (Optical Loop System Only)
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.10.1 Loop test (optical loop system only) This test checks the line status of the forward and reverse loops upon completion of the wiring of the optical loop system. Also, when a loopback is being executed, it checks the station that executes the loopback.
Page 115: Setup Confirmation Test
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.10.2 Setup confirmation test The switch settings of the network module can be checked with this test. The following three types of items can be checked: Control station duplicate check Not performed on remote I/O network. Station number duplicate check Matching between the network number set for the station to which GX Developer is connected and the network number set with a network...
Page 116: Station Order Check Test (Optical Loop System Only)
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.10.3 Station order check test (optical loop system only) This test checks the connected station numbers in the optical loop system. The following connection orders can be checked by the loop status (displayed on the station order check test result screen.
Page 117: Communication Test
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION MELSEC-Q 4.10.4 Communication test This test checks whether or not data communication can normally be performed between the host and a destination station (designated with network number and station number). Especially when the destination has another network number, the relay network and station numbers are displayed.
Page 118: Parameter Settings
5 PARAMETER SETTINGS MELSEC-Q 5 PARAMETER SETTINGS There is a needed use GX Developer to set the remote master station CPU module and each of the parameters in the remote I/O station network module in order to make the remote I/O network operate. In setting the parameters, it is possible to make settings from the selection of the type of MELSECNET/H to the application functions.
Page 119 5 PARAMETER SETTINGS MELSEC-Q (2) Parameter settings for remote I/O station Set the following functions as necessary. Required PLC Parameters · · · · Section 5.1.1 (1) PLC system settings (2) PLC RAS settings (3) Operational settings (4) I/O assignment Not required Intelligent function module parameter settings Set the following...
Page 120 5 PARAMETER SETTINGS MELSEC-Q Table 5.1 Remote master station network parameter setting items Network station type Reference Remote master station Parameter setting item section — Settings with the network module Section 4.3 Station number (STATION No.) Section 4.3.1 Mode (MODE) Section 4.3.2 —...
Page 121 5 PARAMETER SETTINGS MELSEC-Q Table 5.2 Remote I/O station PLC parameter setting items Network station type Reference Remote I/O station Parameter setting item section — PLC system settings Number of empty slots Section 5.2.1 Module synchronization settings — PLC RAS settings Section 5.2.1 Error check —...
Page 122: Remote Master Station Parameter Setting
5 PARAMETER SETTINGS MELSEC-Q 5.1 Remote Master Station Parameter Setting The remote master station sets the network parameters to the CPU module. 5.1.1 Setting the number of module cards (Network type) Set the network type and the station type for each module. Up to four cards for the MELSECNET/H and up to eight cards including the Ethernet can be selected.
Page 123: Network Settings
5 PARAMETER SETTINGS MELSEC-Q 5.1.2 Network settings These parameters are used to configure the MELSECNET/H network. Set the starting I/O No., network No., total number of (slave) stations, group No. and mode for each of the module model names set in the number of module cards settings. (1) Starting I/O No.
Page 124: Mode
5 PARAMETER SETTINGS MELSEC-Q (4) Group No. (Can be set for multiplexed remote master station/multiplexed remote sub-master station only) Set the group No. to send data simultaneously to other stations in transient transmission. Valid setting range : No group setting (default) 1 to 32 : Group No.
Page 125: Parameter Setting Example
5 PARAMETER SETTINGS MELSEC-Q (6) Parameter setting example The following is an example for system parameter settings including remote master station (remote I/O network) and controlling station (PLC to PLC network). (System configuration) Remote master station Control station QCPU QJ71 QJ71 LP21 BR11...
Page 126: Common Parameter
5 PARAMETER SETTINGS MELSEC-Q 5.1.3 Common parameter The common parameters set the LB, LW, LX and LY cyclic transmission range that allows sending and receiving between remote master stations and remote I/O stations in a network. Common parameter settings only need to be set for the remote master station. (1) LX/LY settings LX sets the remote master station (X) addresses the input the signals (X) and sets which of the intelligent function module input reads to.
Page 127 5 PARAMETER SETTINGS MELSEC-Q POINT (1) Set the setting for the remote master station side to the input/output number of the remote I/O station module that is mounted. Remote master station Remote I/O station Actual I/O 1FFF 1FFF If there is an error in the mounting condition, malfunctioning will occur. Remote master station Remote I/O station Actual I/O...
Page 128: Lb/Lw Setting
I/O module link register W by intelligent parameters, the remote master station can read and write intelligent function module buffer memory data from the remote I/O module via LW. Remote master station Remote I/O station (Station No. 1) QJ71LP21 QJ72LP25 intelligent QCPU QJ71BR11...
Page 129: Reserved Station Designation
5 PARAMETER SETTINGS MELSEC-Q POINT (1) Set so that the M station R station and M station R station do not overlap. Good example Bad example M station R station M station R station M station M station R station R station (2) When the MELSECNET/H remote I/O network uses the link dedicated instructions (REMFR, REMTO, READ, WRITE), there is no need for LB/LW for...
Page 130 5 PARAMETER SETTINGS MELSEC-Q POINT In the case of the multiplexed remote I/O network for redundant system, set the link devices in the tracking settings in the redundant parameters to update the link devices between the multiplexed remote master station and multiplexed remote sub-master station.
Page 131: Supplemental Settings
5 PARAMETER SETTINGS MELSEC-Q 5.1.4 Supplemental settings The supplemental settings are included in common parameter settings to provide more precise usage. Keep the default settings for normal use. Common parameters supplemental are only for remote master stations. [Setting items] Constant scan The constant scan function is used to maintain the link scan time constant.
Page 132 5 PARAMETER SETTINGS MELSEC-Q With multiplex transmission (see Section 7.4) Set this item when executing the multiplex transmission function. The multiplex transmission function is used when both the forward and reverse loops are in the normal status to speed up the transmission rate using both loops at the same time.
Page 133: Network Refresh Parameters
5 PARAMETER SETTINGS MELSEC-Q 5.1.5 Network refresh parameters The refresh parameters are used to transfer the link device data (LB, LW, LX, LY) of the network link module to the devices (X, Y, M, L, T, B, C, ST, D, W, R, ZR) of the CPU module for operation of the sequence programs.
Page 134 5 PARAMETER SETTINGS MELSEC-Q (Refresh parameter setting screen) POINT This check function only checks MELSECNET/H network parameters. Assignment method Select the device range input method from either Points/Start or Start/End. • Default: Start/End Transient transmission error history status Select whether to overwrite or hold the error history. •...
Page 135 5 PARAMETER SETTINGS MELSEC-Q POINT Either of the following settings must be made to use the entire device range (16k points) of LB/LW. Change the number of B/W device points. (Refer to the following example.) Make the refresh parameter settings so that B/W and other devices will be assigned as the refresh destination devices of LB/LW.
Page 136 5 PARAMETER SETTINGS MELSEC-Q (1) Concept of the network refreshing (a) Network refresh ranges The devices that fall into both the range of all the stations set with the common parameters ("start address to end address" of 1R1 to 1R3) and the ranges set with the refresh parameters are refreshed.
Page 137 5 PARAMETER SETTINGS MELSEC-Q (2) How to set the refresh parameters (a) Automatic setting with the Default button The network refresh parameters can be set as follows based on the number of installed modules and the installation locations using the Default button. Installation location Module 1...
Page 138 5 PARAMETER SETTINGS MELSEC-Q POINT LX/LY cannot be automatically set with the Default button. (b) Setting method When using the assignment method of Start/End, set the start and end addresses of the network module and the start address of the PLC side. Master module CPU module 2048 points...
Page 139 5 PARAMETER SETTINGS MELSEC-Q (3) Setting example The following shows an example of the refresh parameters settings: [System configuration] QCPU QJ71 QJ71 LP21 BR11 Network No.2 Network No.1 [Parameter assignments] CPU module Master module (1M Master module (2M 0 to 7F 0 to 7F 100 to 17F 100 to 17F...
Page 140 5 PARAMETER SETTINGS MELSEC-Q [Setting screen] The following shows the settings of the refresh parameters for each module that are displayed on the screen. Settings of module 1 (1M ) (transfer SB, transfer SW, transfers 1 to 6) (Transfers 7 to 8) Settings of module 2 (2M ) (transfer SB, transfer SW, transfers 1 and 2) 5 - 23...
Page 141: Valid Module During Other Station Access
5 PARAMETER SETTINGS MELSEC-Q 5.1.6 Valid Module During Other Station Access This parameter is used to specify any of the following modules to be relayed when a data communication request for which the network No. of the access target PLC station cannot be specified from the host (access from the QJ71C24 (A compatible 1C frame), QJ71E71 (A compatible 1E frame), etc.
Page 142: Redundant Settings
5 PARAMETER SETTINGS MELSEC-Q 5.1.7 Redundant settings For the multiplexed remote master station for redundant system, it is necessary to set the same mode as the mode applied to the multiplexed remote master station (system A) to the multiplexed remote sub-master station (system B). Set the mode of system B in the redundant settings.
Page 143: Remote I/O Station Parameter Settings
5 PARAMETER SETTINGS MELSEC-Q 5.2 Remote I/O Station Parameter Settings For remote I/O stations, set up the PLC parameters, network parameters, and remote password on the remote I/O module as needed. POINT After writing the parameters to the remote I/O module, reset it to enable the parameters that have been set.
Page 144 5 PARAMETER SETTINGS MELSEC-Q 1: The operation mode of a remote I/O station under the error status can be set differently from the parameters of the remote master station (CPU module). When an error (fuse blowout or I/O verification error) occurs on the remote master station (CPU module) and remote I/O station, the data link and output of the remote I/O station are determined based on the combination of the parameter settings of remote I/O stations and remote master station (CPU...
Page 145 5 PARAMETER SETTINGS MELSEC-Q Operational settings Remote I/O switch settings For future expansion. Cannot be set at present time. Assignment method Select the allocation method for sending parameters between devices: "Points/Start" or "Start/End". • Bit devices (B,M) have number of points in units of 16 and the Start/End address is allocated in multiple units of 16.
Page 146 5 PARAMETER SETTINGS MELSEC-Q POINT When the intelligent function module buffer memory is located in several different areas, the forwarding parameter between devices are convenient when you wish to combine them for access. Intelligent function Master module CPU module Remote I/O module module Buffer Buffer...
Page 147 5 PARAMETER SETTINGS MELSEC-Q (2) Network parameters The remote I/O module can set network parameters in the same way as the CPU module. However, the items that can be set are more limited than those on the CPU module. Major Items Description Ethernet settings Sets the Ethernet network parameters.
Page 148: Programming
6 PROGRAMMING MELSEC-Q 6 PROGRAMMING 6.1 Programming Precautions This section explains the precautions in creating programs using data on the network. 6.1.1 Interlock related signals A list of the interlock signal devices used in the sequence programs is provided below. See Appendix 2, "List of the Link Special Relays (SB)"...
Page 149 6 PROGRAMMING MELSEC-Q List of Interlock Signal Devices Device status Device Name Description Off (0) On (1) Indicates the operation status of the network SB20 Module status module and the communication status with the Normal Abnormal CPU. Remote I/O station or Remote master station Indicates the station type which is set by the SB44...
Page 150: Program Example
6 PROGRAMMING MELSEC-Q 6.1.2 Program example Interlocks should be applied to the programs according to the link status of the host and other stations. The following example shows an interlock in the communication program that uses the link status of the host (SB47, SB49) and the link status of station number 2 (bit 1 of SW70 and bit 1 of SW74).
Page 151 6 PROGRAMMING MELSEC-Q If the initial settings for the buffer memory of the intelligent function module on a remote I/O station are set by a dedicated link command (REMTO instruction), write the program so that when only that remote I/O module is reset (by turning the remote I/O module power supply off or by using the remote I/O module reset switch), the remote master station will detect that condition and will once again execute the initial settings in the intelligent function module.
Page 152: Cyclic Transmission
6 PROGRAMMING MELSEC-Q 6.2 Cyclic Transmission The link scan of the remote I/O network and the sequence scan of the CPU module operate asynchronously. Thus, the link refresh executed per sequence scan is asynchronous with the link scan. Depending on the timing of the link refresh, link data with data types of more than 32 bits (two words), such as the ones below, may be broken up into new and old data, which may coexist in 16-bit (one word) units.
Page 153: Block Guarantee Of Cyclic Data Per Station
6 PROGRAMMING MELSEC-Q 6.2.2 Block guarantee of cyclic data per station By enabling the parameter settings shown below, handshaking for the cyclic data is performed between the CPU and the network module and then the network is refreshed. Through the cyclic data handshaking, the link data block is guaranteed for each station (to prevent link data separation per station As shown below, set the send and receive parameters as needed.
Page 154: Communication Between Input/Output Module And Intelligent Function Module
6 PROGRAMMING MELSEC-Q 6.3 Communication Between Input/Output Module and Intelligent Function Module This section introduces the settings that are required to allow the CPU module to communicate with the remote I/O station input/output module and the intelligent function module using cyclic transmission. The following example is used to explain this configuration.
Page 155 6 PROGRAMMING MELSEC-Q CPU module: Refresh parameters Sets the input/output range for refreshing between the CPU module and master module. Remote I/O module: Intelligent parameter (Initial settings) Set so that channel 1 is sampling process, channel 2 is 50 times of average processing, channel 3 is 100 ms of average processing.
Page 156 6 PROGRAMMING MELSEC-Q Remote I/O module: Intelligent parameters (Automatic refresh) Sets the digital output vale for channels 1 to 3 and the device for refreshing the error code. 2 : Note that the number of intelligent function module parameters that may be set for automatic refresh setting is limited.
Page 157 6 PROGRAMMING MELSEC-Q (Program example) Program for communicating with input/output module QX40,QY40P The sequence program uses input (X100 to X10F) and output (Y110 to Y11F) to handle remote I/O station (station No. 1) QX40 input and QY40P output. Input from remote I/ O station X0 Output to remote I/ O station Y10 Program for communicating with intelligent function module Q64AD The 64AD digital value can be read out by W0 to W3 by the automatic refresh...
Page 158: Dedicated Link Instruction List
6 PROGRAMMING MELSEC-Q 6.4 Dedicated Link Instruction List The following table outlines the instructions that can be used for the MELSECNET/H. For details on the format and program examples of each instruction, see the applicable section listed in the Reference section column. List of dedicated link instructions : Can be used : Cannot be used...
Page 159 6 PROGRAMMING MELSEC-Q Execution Target station station Reference Multiplexed Multiplexed Name Description Instruction QnPH QnPRH section remote remote sub- master master station station SEND: Writes data to the target station (network module) of the target network No. RECV: Reads the data sent by SEND to the CPU device. Data SEND send...
Page 160 6 PROGRAMMING MELSEC-Q Execution Target station station Reference Multiplexed Multiplexed Name Description Instruction QnPH QnPRH remote remote sub- section master master station station [A-compatible instruction] Reads the CPU device data of the target station of the target network Other Network module Network module station Word device Channel 1...
Page 161 6 PROGRAMMING MELSEC-Q Execution Target station station Reference Multiplexed Multiplexed Name Description Instruction QnPH QnPRH remote remote sub- section master master station station "Write clock data" to the CPU module of other station. Network module Network module Write Channel 1 clock Channel 2 Channel 3...
Page 162: Using The Link Special Relays (Sb)/ Link Special Registers (Sw)
6 PROGRAMMING MELSEC-Q 6.5 Using the Link Special Relays (SB)/ Link Special Registers (SW) The data linking information is stored in the link special relays (SB)/registers (SW). They can be used by the sequence programs, or used for investigating faulty areas and the causes of errors by monitoring them.
Page 163: Application Functions
7 APPLICATION FUNCTIONS MELSEC-Q 7 APPLICATION FUNCTIONS When applying the program examples introduced in this chapter to the actual system, make sure to examine the applicability and confirm that it will not cause system control problems. Chapter 3 Basic Cyclic transmission function Communicating with input/output module ·...
Page 164: Transient Transmission Function (Non-Periodical Communication)
7 APPLICATION FUNCTIONS MELSEC-Q 7.1 Transient Transmission Function (Non-Periodical Communication) The transient transmission function performs data communication only when it is requested between stations. The transient transmission function can be requested with the dedicated link instructions (REMFR, REMTO, READ and WRITE) GX Developer, the intelligent function module, etc.
Page 165: Dedicated Link Instruction
7 APPLICATION FUNCTIONS MELSEC-Q 7.1.1 Dedicated link instruction (1) Reading/writing remote I/O station intelligent function module buffer memory (REMFR/REMTO) The following describes the REMFR/REMTO instruction format and provides example programs. The REMFR instruction reads the data from the buffer memory of the intelligent function module mounted to the remote I/O station.
Page 166 7 APPLICATION FUNCTIONS MELSEC-Q REMTO instruction (Network No. designation) Write command Z: Executed when on Z.REMTO "Jn" Write command ZP: Executed when rising ZP.REMTO "Jn" Description of setting Setting range Object network No. 1 to 239 (n1) Channel number 1 to 8 (n2) Object number 1 to 64...
Page 167 7 APPLICATION FUNCTIONS MELSEC-Q Instruction execution timing Normal completion (REMFR instruction) REMTO Sequence scan Write command Write completion device (Device designated in D5) 1 scan Host CPU Write completion device (D5 + 1 device) Set data (Devices designated in D1, D2, D4) Write data storage device (Device...
Page 168 7 APPLICATION FUNCTIONS MELSEC-Q (REMTO instruction) REMTO Sequence scan Write command Write completion device (Device designated in D5) 1 scan Host CPU Write completion device (D5 + 1 device) Set data (Devices designated in D1, D2, D4) Write data storage device (Device W (M designated in D3)
Page 169 7 APPLICATION FUNCTIONS MELSEC-Q Abnormal completion (REMFR instruction) REMFR Sequence scan Read command Read completion device (Device designated in D5) Host CPU Read completion device (D5 + 1 device) 1 scan Set data (Devices designated in D1, D2, D4) Error code storage Error code device (SW31) Master module...
Page 170 7 APPLICATION FUNCTIONS MELSEC-Q (REMTO instruction) REMTO Sequence scan Write command Write completion device (Device designated in D5) Write completion Host CPU device (D5 + 1 device) 1 scan Set data (Devices designated in D1, D2, D4) Write data storage device (Device Error code W (M...
Page 171 7 APPLICATION FUNCTIONS MELSEC-Q Program example The following shows an example of a REMFR/REMTO instruction on the following system design. It is a program for accessing the buffer memory of Q62DA and Q64AD mounted to a remote I/O station. System design Remote I/O station (Station number 0) QJ71 QX40...
Page 172 7 APPLICATION FUNCTIONS MELSEC-Q Initial data read Initial process request Module READY Operating conditions set request Operating Module Operating Operating conditions conditions READY conditions set request set request set completed Setting analog output permit Analog CH1, output output permit/ permit prohibit request CH2, output...
Page 173 7 APPLICATION FUNCTIONS MELSEC-Q Q64AD Communication program for Q64AD Host baton 1 msec pass status timer Host data 1 msec link status timer Station No.1 baton 1 msec pass status timer 1 msec Station No. 1 timer cyclic transmission status Station No.
Page 174 7 APPLICATION FUNCTIONS MELSEC-Q Digital output value read processing Read Module A/D conversion request READY completion flag Error code read and reset process Error Error Read reset generating completion request flag flag Read Error completion clear flag request Error Error Error clear clear...
Page 175: Remote I/O Station System Monitor
7 APPLICATION FUNCTIONS MELSEC-Q 7.2 Remote I/O Station System Monitor It is possible to Remote I/O network can monitor the intelligent function module mounted to the remote I/O station system using GX Developer. By using this, it is possible to easily diagnose the intelligent function module on the remote I/O station.
Page 176: Device Test For Remote I/O Station
7 APPLICATION FUNCTIONS MELSEC-Q 7.3 Device Test for Remote I/O Station The remote I/O network can use operations of GX Developer connected to the remote I/O station to test the input/output devices of the sequence program without affecting the online system. To conduct a test without affecting the system, register the device to be tested in "Forced input output registration/cancellation"...
Page 177 7 APPLICATION FUNCTIONS MELSEC-Q (2) The remote I/O module stops the X input from the input module At this time, the remote I/O station is performing X/Y communication with the remote master station. The remote master station uses the GX Developer which is connected directly to the remote I/O module to perform make an X input from the GX Developer to the remote I/O station and perform an X input test.
Page 178: Multiplex Transmission Function (Optical Loop System)
7 APPLICATION FUNCTIONS MELSEC-Q 7.4 Multiplex Transmission Function (Optical Loop System) Master Remote The multiplex transmission function allows high-speed communications using duplex transmission paths (both the forward and reverse loops) in the optical loop system. In order to execute the multiplex transmission function, setting for the "Supplemental settings"...
Page 179: Return Sequence Station Number Setting Function
7 APPLICATION FUNCTIONS MELSEC-Q 7.5 Return Sequence Station Number Setting Function Master Remote The remote I/O net can set the number of stations for which stations with communication errors during one link scan can perform return sequence. If the number of stations set is large, a large number of communication stations with errors can perform return sequence.
Page 180: Interrupt Settings
7 APPLICATION FUNCTIONS MELSEC-Q 7.7 Interrupt Settings Master Remote The remote master station uses the host interrupt setting parameters to check interrupt conditions at the time data is being received from the remote I/O station. When the interrupt conditions are matched, it issues an interrupt request to CPU module from the master module and starts the interrupt sequence program of the CPU module.
Page 181: I/O Assignment Function
7 APPLICATION FUNCTIONS MELSEC-Q 7.8 I/O Assignment Function Master Remote The I/O assignment function is a convenient function for use under situations such as the following: (1) when changing the I/O response time of the input module, (2) when changing the error time output mode of the output module and (3) when setting the setting switches for the intelligent function module.
Page 182: Stopping/Restarting The Cyclic Transmission And Stopping Link Refreshing (Network Test)
7 APPLICATION FUNCTIONS MELSEC-Q 7.9 Stopping/Restarting the Cyclic Transmission and Stopping Link Refreshing (Network Test) The remote I/O network can use the "network test" of the GX Developer to stop and restart cyclic data. This function is useful when other station's data should not be received or when the host's data should not be sent at system startup (when debugging), etc.
Page 183: Multiplexed Remote Master Function (Qnphcpu Only)
7 APPLICATION FUNCTIONS MELSEC-Q 7.10 Multiplexed remote master function (QnPHCPU only) Multiplex remote master function allows the multiplexed remote sub-master station to take control of the remote I/O stations when the multiplexed remote master station fails. To make this function valid, include the master station (multiplexed remote master station (DM )) and a sub-master station (multiplexed remote sub-master station (DSM...
Page 184 7 APPLICATION FUNCTIONS MELSEC-Q The following describes each item. (1) Continuation of controlling remote I/O stations when multiplexed remote master station fails By mounting the network modules of the multiplexed remote master station and multiplexed remote sub-master station to different PLC CPUs, the multiplexed remote sub-master station automatically controls the remote I/O stations if the multiplexed remote master station fails (switching of master operation).
Page 185 7 APPLICATION FUNCTIONS MELSEC-Q The intelligent function modules such as QJ71C24, QJ71E71 which are mounted to the remote I/O stations can access the station that is currently performing master operation in the MELSEC communication protocol. Access Destination Target Station Number to Be Set Multiplexed remote master station (Station No.
Page 186 7 APPLICATION FUNCTIONS MELSEC-Q Select the multiplexed remote master station or multiplexed remote sub- master station from "Network type" on the "Module count setting screen" of the GX Developer parameters. • Multiplexed remote master station: • Multiplexed remote sub-master station: Since the multiplexed remote master station needs to recognize the station number of the multiplexed remote sub-master station, set the station number of the multiplexed remote sub-master station on the network range...
Page 187 7 APPLICATION FUNCTIONS MELSEC-Q (2) Selection of operating station status when multiplexed remote master station returns to system It is possible to set the parameter of the multiplexed remote master station to select whether the remote I/O stations will be controlled by the multiplexed remote master station or by the multiplexed remote sub-master station when the multiplexed remote master station returns to system while the remote I/O stations are being controlled by the multiplexed remote sub-master station.
Page 188 7 APPLICATION FUNCTIONS MELSEC-Q Return to system as standby station: The multiplexed remote master station returns to the system as the sub- master operating station (standby station). The multiplexed remote sub-master station continues the control of the remote I/O stations. Multiplexed remote Multiplexed remote master station...
Page 189 7 APPLICATION FUNCTIONS MELSEC-Q Switching of multiplexed remote master station operation When the multiplexed remote master station has returned to system, it can be switched to master operation in the following procedure. The multiplexed remote sub-master confirms that the multiplexed remote master station has returned to the system by checking the link special relay SB status.
Page 190 7 APPLICATION FUNCTIONS MELSEC-Q Link special relays used to switch multiplexed remote sub-master station operation Number Name Description SB0014 Remote sub-master station switching Forcibly directs the remote sub-master station that is performing command master operation to shift to sub-master operation. (invalid for redundant systems) OFF : Without directive ON : With directive...
Page 191 7 APPLICATION FUNCTIONS MELSEC-Q (3) Startup of multiplexed remote sub-master station only By setting the same parameters as the multiplexed remote master station, the multiplexed remote sub-master station continues the control of the remote I/O stations if it is powered on and then off while controlling the remote I/O stations. However, the outputs of the remote I/O stations are cleared when the multiplexed remote sub-master stations resumes the controls.
Page 192 7 APPLICATION FUNCTIONS MELSEC-Q (4) Communication among multiplexed remote master station, multiplexed remote sub-master station and remote I/O stations The input (X) data of the remote I/O station and the link relay (B) and link register (W) data sent by the remote I/O station are transferred to both the multiplexed remote master station and multiplexed remote sub-master station.
Page 193 7 APPLICATION FUNCTIONS MELSEC-Q • LB/LW data flow between stations Multiplexed remote master station Multiplexed remote sub-master station (master operation) (sub-master operation) LB/LW LB/LW (c) Data transfer (c) Data transfer 1FFF 1FFF LB/LW 1FFF Remote I/O station Multiplexed remote master station fails Multiplexed remote sub-master station Multiplexed remote master station (master operation)
Page 194 7 APPLICATION FUNCTIONS MELSEC-Q (6) Program example to transfer data between multiplexed remote master station and multiplexed remote sub-master station The following program example assumes that the same program is used on the multiplexed remote master station and multiplexed remote sub-master station to transfer data between the multiplexed remote master station and multiplexed remote sub-master station.
Page 195 7 APPLICATION FUNCTIONS MELSEC-Q Link special relay and link special registers used to make the programs identical The following link special relay and link special registers can be used to check the send/receive device ranges of the multiplexed remote master station and multiplexed remote sub-master station.
Page 196 7 APPLICATION FUNCTIONS MELSEC-Q Program example: For multiplexed remote master station Host baton pass status Host data link status Module status SB75 for multi R sub-master R sub-master cyclic transmission Send LB device No. Receive LB device No. Send LW device No.
Page 197 7 APPLICATION FUNCTIONS MELSEC-Q R master cyclic trans control Continuation processing program used when multiplexed remote master station fails Station 2 baton path status Station 2 cyclic transmission Program for communication with remote I/O station No. 2 In the timer constant K , set the following value. Baton path status (Sequence scan time 4) or more...
Page 198 7 APPLICATION FUNCTIONS MELSEC-Q 7.11 Multiplexed remote master function for the redundant system (QnPRHCPU only) The redundant system uses the multiplexed remote master function to control I/O modules and intelligent function modules. The multiplexed remote master function for the redundant system continues the control of remote I/O stations when the multiplexed remote master station (control system) fails by switching the multiplexed remote master station from the control system to the standby system and switching the multiplexed remote sub-master station (standby...
Page 199: Backup Function Of Master Operation On System Switching Between Control System And Standby System
7 APPLICATION FUNCTIONS MELSEC-Q 7.11.1 Backup function of master operation on system switching between control system and standby system The redundant system consists of a control system (multiplexed remote master station) and standby system (multiplexed remote sub-master station) of the same system configuration. If a power supply error or CPU error occurs in the control system, the QnPRHCPU of the standby system switches to the control system to continue the operation of the redundant system.
Page 200: Master Operation By The Station That Has Started Up As The Control System
7 APPLICATION FUNCTIONS MELSEC-Q The output of the remote I/O station is held while master operation is switched from the multiplexed remote master station to the multiplexed remote sub-master station. Multiplexed remote master station Multiplexed remote sub-master station Output is held during system switching. Remote I/O station Remote I/O station Remote I/O station If the multiplexed remote master station returns to the normal status while the multiplexed remote sub-master station controls remote I/O stations, the...
Page 201: System Switching Request Function Of Control System
7 APPLICATION FUNCTIONS MELSEC-Q 7.11.3 System switching request function of control system The control system includes the system switching request function, i.e., the network module mounted in the control system issues the system switching request to the QnPRHCPU when it detects the data link error such as link cable disconnection or communication error.
Page 202 7 APPLICATION FUNCTIONS MELSEC-Q The network module issues a system switching request when the status of data link is changed from "under data link" to "data link halted." (when the D.LINK LED of the network module turns off.) Although the time interval from when the data link is stopped to when the system switching request is issued to the QnPRHCPU is set to two seconds, the interval can be changed using the link special relay SB and link special register SW.
Page 203 7 APPLICATION FUNCTIONS MELSEC-Q 7.11.4 Access function by specifying the control system or standby system This function is for making access to the QnPRHCPU by specifying the control system or standby system using GX Devloper or other method. By using this function, access to the control system is enabled even after system switching occurs due to error.
Page 204: Remote Password
7 APPLICATION FUNCTIONS MELSEC-Q 7.12 Remote password The remote password function is the function for preventing a remote user from illegally connecting to a remote I/O module and PLC CPU. The remote password function can be used by setting a remote password for a remote I/O module.
Page 205 7 APPLICATION FUNCTIONS MELSEC-Q Unlocking and locking the remote password The remote password is unlocked (connection is allowed) via the modem by the serial communication module or via Ethernet by the Ethernet module. When the remote password is matched, connection to the remote I/O module is allowed.
Page 206 7 APPLICATION FUNCTIONS MELSEC-Q Setting procedure of remote password "GX Developer" "Remote Password" "Remote Password Setting" screen "Remote Password Details Setting" screen Setting screen Set a remote password Detailed setting is necessary for QJ71E71. Setting items Item Setting Setting range/option Password settings Enter a remote password 4 characters, ASCII code...
Page 207 7 APPLICATION FUNCTIONS MELSEC-Q Error codes detected by remote I/O module Error code Error message LED status Description Measures 3400 REMOTE ERR. LED: The remote password file includes Correct the starting I/O of the target PASS. ERR. incorrect settings. module within 0000 to 0FE0 of the •...
Page 208: Troubleshooting
8 TROUBLESHOOTING MELSEC-Q 8 TROUBLESHOOTING In order to ensure high system reliability, it is important to take precautions before the system is operated and to quickly and effectively correct problems if they do occur. This is why it is important to perform off-line testing of the network and checking of the cables when first starting the system.
Page 209: Network Diagnostics (Network Monitor)
8 TROUBLESHOOTING MELSEC-Q 8.1 Network Diagnostics (Network Monitor) The status of the remote can be checked using the network diagnostic function of GX Developer. When an error occurs, the faulty station can be identified using the host information, other station information, and error history monitor functions of the network. GX Developer network diagnosis can be implemented for the remote master station and remote I/O station 1: Use GX Developer Version 6.01B or later when executing network diagnosis from...
Page 210 8 TROUBLESHOOTING MELSEC-Q From previous page [Status of self] • Parameter settings • Reserved station setting • Transmission mode • Duplex transmission setting • Duplex transmission status Error history monitor [Network information] • Network Type • Module No. • Network No. •...
Page 211: Host Information
8 TROUBLESHOOTING MELSEC-Q 8.1.1 Host information With the host information, the information of the entire network of the connection destination and the status of the host can be checked. [Network info.] Network type (SB0040, SB0044, SB0057, SW0046) Displays the network type of the host. •...
Page 212 8 TROUBLESHOOTING MELSEC-Q [Link information] Mode (SW0043) Displays the operation mode of the host. • Online • Offline (debug mode) • Offline • Forward loop test • Reverse loop test • Station-to-station test (Station that executes tests) • Station-to-station test (Station to be tested) F loop status (SB0091), Loopback station (SB0099) Displays the status of the forward loop side.
Page 213: Other Station Information
8 TROUBLESHOOTING MELSEC-Q 8.1.2 Other station information With the other station information, the status of the communication, data link, parameters, CPU, loop and reserved station status of each station can be checked. The buttons 3) and 7) can be selected only when diagnosis is executed from the remote master station.
Page 214 8 TROUBLESHOOTING MELSEC-Q Data-Link status of each station (SW0074 to 77) Displays the status of the cyclic transmission. • Normal display : Normal station or reserved station • Highlighted display : Abnormal station (data link not executed) Parameter status of each station Displays the parameter communication status of each station (SW0078 to 7B).
Page 215: Network Monitor Details
8 TROUBLESHOOTING MELSEC-Q 8.1.3 Network monitor details The remote master station information, data link information and parameter status of the host station can be confirmed. Displayed as shown below when diagnosis is executed from the remote I/O station. [Network info.] This area displays the same information as the host information in Section 8.1.1.
Page 216 8 TROUBLESHOOTING MELSEC-Q [Data link information] Total number of link stations Displays the total number of the link stations set with the parameter plus one (for the remote master station). Station of maximum normal transmission (SW005A) Displays the highest station number that is executing the baton pass normally (the status where the transient transmission is possible).
Page 217 8 TROUBLESHOOTING MELSEC-Q 10) Reason for transmission stop (SW0049) Displays the causes why the host's data linking (cyclic transmission) was disabled. • Normal • Instructed by other station ( station): Other station transmission ( station) stopped the cyclic. • Instruction by the host: The host stopped the cyclic transmission.
Page 218: Error History Monitor
8 TROUBLESHOOTING MELSEC-Q 8.1.4 Error history monitor With the error history monitor information, the status of the forward/reverse loop errors, communication errors, and transient transmission errors that have occurred can be checked. In addition, the detailed error history display and the error history can be cleared on this screen.
Page 219: Troubleshooting
8 TROUBLESHOOTING MELSEC-Q UNDER (SW00B8, SW00C0) Displays how many UNDER errors have occurred. <Error Cause> Power-ON/OFF of the adjacent station, faulty cable, etc. <Corrective Action> See the following POINT. CRC (SW00B9, SW00C1) Displays how many CRC errors have occurred. <Error Cause> Isolation of the sending station, faulty cable, hardware failure, noise, etc.
Page 220 8 TROUBLESHOOTING MELSEC-Q (2) Error history monitor details Displays the causes of loop switches and the history of the transient transmission errors. [Loop switching] Requested by (SW00E0 to E7) Displays the number of the station (not necessarily an adjacent station) that requested the loop switch and loopback.
Page 221 8 TROUBLESHOOTING MELSEC-Q 8.2 Troubleshooting The following flowchart illustrates a simple troubleshooting flow. (1) Check that the host has joined the network. Start the troubleshooting of the host by monitoring the status of the host. First, check whether or not the host has joined the network. This is important because it is not possible to monitor the status of other stations and to perform troubleshooting on other stations unless the host has joined the network.
Page 222 8 TROUBLESHOOTING MELSEC-Q For the remote I/O module Start Host "T.PASS" LED on? Host baton bus is normal Host normal status "RUN" LED on? Is power being supplied to the power supply module? "ERR" LED on? Implement offline tests (1) Hardware test (2) Self-loopback test (3) Internal self-loopback test "REM."...
Page 223 8 TROUBLESHOOTING MELSEC-Q (2) From monitoring the network status to troubleshooting of a faulty station The following flowchart illustrates the procedure for monitoring the status of the entire network, detecting a faulty station, and then performing troubleshooting for the applicable station. The status of the entire network is monitored with GX Developer.
Page 224 8 TROUBLESHOOTING MELSEC-Q Check the baton pass status of the applicable station with GX Developer's network monitor. Are all the stations executing the baton pass normally? Communication is normal. Check the stations that are not executing the baton pass. Is the "RUN" LED of the applicable station lit? Is the PLC...
Page 225 8 TROUBLESHOOTING MELSEC-Q Is the send and receive data within the system specifications? Is the send/ receive data according to system specifications? Value 0: The host Value of SW47 transmitting normally <Troubleshooting> Value 3: No host send area Normal communication Checks the contents of each Value 4: Abnormal parameters detected parameter that has been set...
Page 226: Items To Be Checked First
8 TROUBLESHOOTING MELSEC-Q 8.2.1 Items to be checked first Check item Checking procedure Monitor the transmission status of each station Check the CPU module status of the faulty station, the status of the network modules, with GX Developer 's network monitor. the loop status of each station to search for the location where the error occurred.
Page 227: When Data Link Is Disabled Because Of Reset Or Power Off Of Each Station
8 TROUBLESHOOTING MELSEC-Q 8.2.3 When data link is disabled because of reset or power off of each station Check item Checking procedure Check the wiring status with GX Developer's network diagnostic loop test. Is the cable wired properly? (See Section 4.10.1.) Check the status of each station to see whether the entire system is faulty or a specific- Are the cables disconnected? station is faulty, and locate the faulty area.
Page 228: When The Transmission And Reception Data Are Abnormal
8 TROUBLESHOOTING MELSEC-Q 8.2.5 When the transmission and reception data are abnormal (1) The cyclic transmission data is abnormal Check item Checking procedure Stop the CPU modules of both the remote master station and turn the link device of the sending station on and off by GX Developer's test operation to check whether or not data is sent to the receiving station.
Page 229: When A Multiplexed Remote I/O Network For The Redundant System Does Not Operate Normally
8 TROUBLESHOOTING MELSEC-Q 8.2.7 When a multiplexed remote I/O network for the redundant system does not operate normally (1) QnPRHCPU will not perform system switching even when the data link cable is disconnected. Check item Checking procedure Isn’t the Q64RP of the standby system turned off? Confirm the status of the external power supply of the standby system. Hasn't a stop error occurred on the QnPRHCPU of Connect GX Developer to the QnPRHCPU of the standby system and execute PLC the standby system?
Page 230: Error Codes
8 TROUBLESHOOTING MELSEC-Q 8.3 Error Codes 8.3.1 MELSECNET/H error code list When data linking cannot be performed using the cyclic transmission, or when communication cannot be performed normally using the transient transmission with an instruction of a sequence program or GX Developer, the error codes (hexadecimal) are stored in the special link register or displayed on the GX Developer's system monitor.
Page 231 8 TROUBLESHOOTING MELSEC-Q For the remote master station, check the code, history, description, and action of the error that occurred on the network module on the portions of the module detailed information screen shown below. For the error code of the transient instruction issued by a PLC program, check the device data of section (3).
Page 232 8 TROUBLESHOOTING MELSEC-Q (3) Storage of the error codes of the link dedicated instruction Check the error code generated when the link dedicated instruction is executed through the device data below. The error codes of the transient transmission are also stored in the link special registers SW00EE to SW0FF.
Page 233 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure Review the station number setting. F10B Duplicate station number error The setup confirmation test of network diagnosis is effective. Review the station number setting. F10C Duplicate control station error The setup confirmation test of network diagnosis is effective.
Page 234 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure Check for the operation status of the control/sub-control station, faulty cables, incorrect cable wiring, absence of terminating resistor (in the case of the bus), and duplication of station numbers, control stations, and remote master F11F Initial status (no baton addressed to host)
Page 235 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure The cable is faulty, or the hardware of the network module is faulty. F70C System error If a communication error has occurred, review the cable. If not, the hardware of the network module is faulty.
Page 236 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure The hardware of the network module is faulty. F7CD System error Contact your local Mitsubishi representative. Confirm the set values (mode, etc.) in the control data of a dedicated F7E1 Control data error instruction.
Page 237 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure Review station-specific parameters. Set common parameters station-specific parameters for the sending range of the host station. F821 Station-specific parameter error If no station-specific parameters are set, the hardware of the CPU or network module is faulty.
Page 238 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure Create and write network parameters to the PLC. F842 System error If the error recurs, the hardware of the CPU or network module is faulty. Contact your local Mitsubishi representative.
Page 239 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure FD21 Hardware error (send interrupt error) The cable was disconnected during the online test. Reconnect the cable, and continue the online test. FD22 Hardware error (receive interrupt error) Check for faulty cables, faulty hardware, incorrect wiring, absence of FD23 Data comparison error...
Page 240 8 TROUBLESHOOTING MELSEC-Q Table 8.1 Error code list (Continued) Error No. Description of error Corrective measure FE30 System error FE31 System error FE32 System error The hardware of the network module is faulty. FE34 System error Contact your local Mitsubishi representative. FE36 System error FE37...
Page 241: Error Codes Corresponding To Cpu Module Detected On Remote I/O Station
8 TROUBLESHOOTING MELSEC-Q 8.3.2 Error codes corresponding to CPU module detected on remote I/O station The remote I/O station performs some of the same processes as the CPU module. Accordingly, the remote I/O station detects the error codes in the same way they are detected by the CPU module.
Page 242 8 TROUBLESHOOTING MELSEC-Q (1) Error code list The following information deals with error codes and the meanings, causes, and corrective measures of error messages. <Relevant CPU> : Indicates all the QnACPUs and QCPU. QCPU : Indicates all the Q series CPU modules. Q00J/Q00/Q01 : Indicates the Basic model QCPU.
Page 243 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) 1000 1001 Q00J/Q00/Q01 1002 Qn(H) QnPH 1003 QnPRH 1004 Q00J/Q00/Q01 • Take noise reduction measures. Qn(H) Run mode suspended or failure of main CPU • Reset the CPU module and RUN it again.If the same 1005 QnPH •...
Page 244 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 1101 1102 1103 1104 At power ON/At reset 1105 RAM ERROR ---- ---- Flicker...
Page 245 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) The sequence program storing built-in RAM/program 1101 memory in the CPU module is faulty. 1102 The work area RAM in the CPU module is faulty. This suggests a CPU module hardware fault. (Contact 1103 The device memory in the CPU module is faulty.
Page 246 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 1200 At power ON/At 1201 reset 1202 OPE. CIRCUIT 1203 ---- ---- Flicker Stop...
Page 247 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) The operation circuit for indexing in the CPU module does 1200 not operate normally. The hardware (logic) in the CPU module does not operate 1201 normally. The operation circuit for sequence processing in the CPU 1202 module does not operate normally.
Page 248 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 1310 I/O INT. ERROR ---- ---- Flicker Stop During interrupt 1311 At power ON/At reset/When intelligent function...
Page 249 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Any of the mounted modules is experiencing a hardware An interruption has occurred although there is no interrupt fault. Therefore, check the mounted modules and change 1310 module.
Page 250 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) At power ON/At 1411 ---- reset Unit No. Flicker Stop During execution of 1412 Program error location FROM/TO...
Page 251 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) When performing a parameter I/O allocation the intelligent function module/special function module could not be accessed during initial communications. 1411 (On error occurring, the head I/O number of the Reset the CPU module and RUN it again.
Page 252 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) When an END 1415 Base No. ---- Flicker Stop instruction executed. CONTROL-BUS.
Page 253 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Q00J/Q00/Q01 Qn(H) Reset the CPU module and RUN it again. If the same 1415 Fault of the main or extension base unit was detected. QnPH error is displayed again, the intelligent function module, QnPRH CPU module or base unit is faulty.
Page 254 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) Unit No. Off/ Flicker/ When an END 2000 UNIT VERIFY ERR. [For Remote I/O network] ---- Stop/Continue...
Page 255 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Replace the CPU module incompatible with the multiple In a multiple CPU system, a CPU module incompatible Qn(H) CPU system with a CPU module compatible with the with the multiple CPU system is mounted.
Page 256 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 2100 At power ON/At SP. UNIT LAY ERR. Unit No. ---- Flicker Stop reset...
Page 257 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Slot loaded with the QI60 is set to other than the Inteli Qn(H) Make setting again to match the PLC parameter I/O (intelligent function module) or Interrupt (interrupt module) QnPH assignment with the actual loading status.
Page 258 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 2104 2105 Stop At power ON/At SP. UNIT LAY ERR. Unit No. ---- Flicker reset...
Page 259 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) At the MELSECNET/MINI auto refresh network parameter Reset the network parameter MELSECNET/MINI auto settings, the module allocation that was set is different 2104 refresh unit module allocation setting so that it conforms from the actual module models at the station numbers in to the station number of the module that is actually linked.
Page 260 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) (SD0) ERROR 2110 Off/ Flicker/ When instruction Unit No. Program error location Stop/Continue executed.
Page 261 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • The location designated by the FROM/TO instruction set is not the intelligent function module/special function module. Q00J/Q00/Q01 • The module that does not include buffer memory has •...
Page 262 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 2120 2121 2122 At power ON/At ---- ---- Flicker Stop reset 2124 SP.
Page 263 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Q00J/Q00/Q01 2120 Check the location of the base unit. The location of Q B and QA1S B is improper. Qn(H) QnPH Qn(H) The CPU module is installed at other than the CPU slot or Check the loading position of the CPU module and 2121 QnPH...
Page 264 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 2210 At power ON/At BOOT ERR0R Drive Name ---- Flicker Stop reset 2211 2300...
Page 265 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Q00J/Q00/Q01 Qn(H) The contents of the boot file are incorrect. Check the boot setting. QnPH QnPRH 2210 Check and correct the valid parameter drive settings There is no boot file in the drive designated by the made by the DIP switches.
Page 266 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 2410 2411 File name/ Off/ Flicker/ When instruction FILE OPE. ERROR Program error location Stop/Continue Drive Name...
Page 267 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Read the individual information of the error using the The specified program does not exist in the program peripheral device, check to be sure that the program memory.
Page 268 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 3000 PARAMETER File name/ At power ON/At Parameter number Flicker Stop ERROR Drive Name reset/STOP RUN...
Page 269 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) In a multiple CPU system, the intelligent function module • Specify the head I/O number of the intelligent function Qn(H) under control of another CPU is specified in the interrupt module under control of the host CPU.
Page 270 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) (SD0) ERROR 3006 3007 3009 PARAMETER File name/ At power ON/At Parameter number Flicker Stop ERROR...
Page 271 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • Delete the setting of the Q02CPU' s high speed interrupt. To use high speed interrupts, change the CPU • The high speed interrupt is set in a Q02CPU. module to one of the Q02H/Q06H/Q12H/Q25HCPU.
Page 272 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) (SD0) ERROR File name/ At power ON/At 3100 LINK PARA. ERROR Parameter number Flicker Stop Drive Name...
Page 273 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) In a multiple CPU system, the MELSECNET/H under • Delete the MELSECNET/H network parameter of the Q00/Q01 control of another CPU is specified as the head I/O MELSECNET/H under control of another CPU.
Page 274 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) At power ON/At 3102 reset/STOP RUN 3103 File name/ LINK PARA. ERROR Parameter number Flicker Stop...
Page 275 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • The network module detected a network parameter • Correct and write the network parameters. error. • If the error occurs after correction, it suggests a •...
Page 276 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) (SD0) ERROR 3200 3201 SFC PARA. ERROR File name Parameter number Flicker Stop STOP RUN 3202 3203...
Page 277 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) The parameter setting is illegal. • Though Block 0 was set to "Automatic start" in the SFC Q00J/Q00/Q01 3200 setting of the PLC parameter dialog box, Block 0 does QnPH not exist.
Page 278 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 4000 4001 INSTRCT. CODE Program error location ---- Flicker Stop 4002 At power ON/At 4003 reset/STOP RUN...
Page 279 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • The program contains an instruction code that cannot 4000 be decoded. • An unusable instruction is included in the program. Q00J/Q00/Q01 The program contains a dedicated instruction for SFC 4001 Qn(H) although it is not an SFC program.
Page 280 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) (SD0) ERROR 4107 4108 4109 4111 OPERATION Off/ Flicker/ When instruction Program error location ---- Stop/Continue 4112...
Page 281 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Using the multiple CPU dedicated instruction completion Q00/Q01 33 or more multiple CPU dedicated instructions were bit, provide interlocks to prevent one CPU module from Qn(H) executed from one CPU module.
Page 282 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) (SD0) ERROR When instruction 4200 FOR NEXT ERROR Program error location ---- Flicker Stop executed.
Page 283 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) No NEXT instruction was executed following the execution of a FOR instruction. 4200 Alternatively, there are fewer NEXT instructions than FOR Read the common information of the error using the instructions.
Page 284 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) SFCP. CODE 4400 Program error location ---- Flicker Stop STOP RUN ERROR 4410 CAN'T SET(BL)
Page 285 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Qn(H) 4400 No SFCP or SFCPEND instruction in SFC program. QnPH Read common information of the error using the QnPRH peripheral device, check error step corresponding to its The block number designated by the SFC program 4410 numerical value (program error location), and correct the...
Page 286 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 4600 SFCP. OPE. Off/ Flicker/ When instruction 4601 Program error location ---- Stop/Continue ERROR...
Page 287 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) The SFC program contains data that cannot be 4600 processed. Read common information of the error using the Exceeds device range that can be designated by the SFC peripheral device, check error step corresponding to its 4601 program.
Page 288 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 5010 Time (value actually PRG. TIME OVER Time (value set) Continue Always measured) 5011...
Page 289 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • The program scan time exceeded the constant scan time specified in the PLC RAS setting of the PLC • Review the constant scan setting time. parameter dialog box.
Page 290 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) MODE. VERIFY ---- ---- Continue Always ERR. 6010 ---- ---- Continue Always OPE.
Page 291 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) The operational status of the control system and standby Synchronise the operation statuses of the control system Q4AR system in the redundant system is not the same. and standby system.
Page 292 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) When an END ---- ---- Continue TRUCKINERR. instruction executed. 6101 Tracking transmission data classification 6102 ----...
Page 293 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) The CPU module detected an error during the handshake Check the condition of the other stations. Q4AR for tracking. • A timeout error occurred in tracking (data transmission). 6101 (This error may be caused by tracking cable removal or other system power-off (including reset).)
Page 294 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) At power ON/At TRK.INIT.ERROR 6140 ---- ---- Flicker Stop reset Reason(s) for system CONTROL EXE.
Page 295 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • Power the corresponding CPU module OFF and then ON again, or reset it and then unreset. If the same error • The other system did not respond during initial still occurs, this indicates the CPU module is faulty.
Page 296 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) STANDBY SYS. 6300 ---- ---- Continue Always DOWN CONTROL SYS. 6310 ---- ---- Flicker...
Page 297 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • Check whether the standby system is on or not, and if it is not on, power it on. Any of the following errors was detected in the backup •...
Page 298 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) 7002 At power ON/At MULTI CPU DOWN Unit No. ---- Flicker Stop reset 7003...
Page 299 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) • Reset the CPU module and RUN it again. If the same • There is no response from the target CPU module in a error is displayed again, this suggests the hardware multiple CPU system at initial communication stage.
Page 300 8 TROUBLESHOOTING MELSEC-Q Table8.2 Error code LED Status Operating Error Code Common Information Individual Information Error Messages Statuses of Diagnostic Timing (SD5 to 15) (SD16 to 26) ERROR (SD0) When instruction 9000 Program error location Annunciator number Continue F**** executed. USER LED On When instruction <CHK>ERR ***-***...
Page 301 8 TROUBLESHOOTING MELSEC-Q Error Code Error Contents and Cause Corrective Action Corresponding CPU (SD0) Read the individual information of the error using the 9000 Annunciator (F) was set ON peripheral device, and check the program corresponding to the numerical value (annunciator number). Read the individual information of the error using the Qn(H) 9010...
Page 302 8 TROUBLESHOOTING MELSEC-Q (2) Clearing an error If the error, which allows the operation to continue, occurs, it can be cleared by remote I/O module as well as CPU module. Make sure to clear the error by remote I/O module, then perform the error clear operation by CPU module.
Page 303: H/W Information
8 TROUBLESHOOTING MELSEC-Q 8.4 H/W Information H/W information screen displays details of the LED and switch information of the network modules. To display the H/W information screen, click the H/W information button on the system monitor window of GX Developer. (1) H/W information on the master module 2) -b 1) -a...
Page 304 8 TROUBLESHOOTING MELSEC-Q (2) H/W switch information This indicates the switch setting data for the master module. 2)-a: Shows the switch settings for the hardware mounted to the master module. Item Description STx10 10 position of station number setting switch. STx 1 1 position of station number setting switch.
Page 305: Appendix
APPENDIX MELSEC-Q APPENDIX Appendix 1 Precautions when Changing Over from a MELSECNET/10 Remote I/O Network to a MELSECNET/H Remote I/O Network. The following describes the precautions to take when switching from an AnUCPU, QnACPU MELSECNET/10 remote I/O network to a QCPU MELSECNET/H remote I/O network.
Page 306 APPENDIX MELSEC-Q (5) Correcting the sequence program There is no need to change sequence programs such as the interlock program that used link special relays and link special resistors and the remote access program that used data link commands. However, the data link instructions (ZNFR/ZNTO instructions) used for accessing the buffer memory of the intelligent function module of the remote I/O station and the data link instructions (ZNRD/ZNWR instructions) used for reading/writing of the remote station word device cannot be used on the MELSECNET/H remote...
Page 307: Appendix 2 Link Special Relay (Sb) List
APPENDIX MELSEC-Q Appendix 2 Link Special Relay (SB) List The link special relay turns on/off by various factors that occur during data linking. Thus, by monitoring or using it in the sequence program, the abnormal status of the data link can be checked. Moreover, the link special relay (SB) that stores the link status is used for the detailed information of the network diagnostics of GX Developer.
Page 308 On: Redundant function supported Indicates the external power supply status to QJ71LP21S-25. SB0042 Power supply status of (When using QJ71LP21-25, 0 is ON.) (66) host Off: Not supplied On: Supplied Indicates the mode set by the switch of the host's network module.
Page 309 APPENDIX MELSEC-Q Table 1 Special link relay (SB) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial When PLC to PLC network Indicates the station type set with the parameter of the host's network module.
Page 310 APPENDIX MELSEC-Q Table 1 Special link relay (SB) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the completion status of the cyclic transmission. Cyclic transmission start SB0051 Off: Not completed (SB0002 is off)
Page 311 APPENDIX MELSEC-Q Table 1 Special link relay (SB) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the status of designating the multiplex remote function. Multiplex remote function SB006B Off: Not designated.
Page 312 APPENDIX MELSEC-Q Table 1 Special link relay (SB) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the operation status of each station's CPU on the PLC- to-PLC network (including the host station).
Page 313 APPENDIX MELSEC-Q Table 1 Special link relay (SB) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the loopback status of the forward loop while the system is operating.
Page 314 APPENDIX MELSEC-Q Table 1 Special link relay (SB) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the offline test completion status. SB00AD Offline test completion Off: Not completed (173) On: Completed...
Page 315: Appendix 3 Link Special Register (Sw) List
APPENDIX MELSEC-Q Appendix 3 Link Special Register (SW) List In the link special register, the data linking information is stored as numeric values. Thus, faulty areas and causes of errors can be checked using or monitoring the link special registers in the sequence programs. Moreover, the link special register (SW) that stores the link status is used for the detailed information of the network diagnostics of GX Developer.
Page 316 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Sets the logical channel number for physical channel number 4. (Valid only for channels on the receiving side) SW000B Logical channel setting...
Page 317 APPENDIX MELSEC-Q Table 2 Link special Register (SW) List (Continued) Use permitted/prohibited Remote Control Normal Remote I/O Name Description master station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the processing result of the ZNWR instruction. ZNWR instruction : Normal completion processing result...
Page 318 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial On inter-PLC network: Stores the condition setting switch status of the host.
Page 319 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores the station that stopped the host data linking. (Valid when the SW0049 is 1.) b15 b14 to b7 b6 b5 b4 b3...
Page 320 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial At the PLC to PLC network. Stores the status of the parameters. SW0055 Parameter setting status : Normal parameter...
Page 321 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores the maximum/minimum/current values of the link scan SW006B Maximum link scan time time (unit (ms)).
Page 322 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores the cyclic transmission status of each station (including the host).
Page 323 Numbers 1 to 64 in the above table indicate the station numbers. SW008C (140) Indicates whether external power supply is available to each SW008D station (For QJ71LP21-25, 0 is ON.) Power Supply Status of (141) 0: Without external power supply (Including stations reserved or Each Station SW008E...
Page 324 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores the reverse loop status of each station (including the host).
Page 325 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores the online test items on the responding side. (Valid when the SB00AB is on.) b8 b7 SW00AA...
Page 326 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores each station’s forward loop usage status during multiplex transmission.
Page 327 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Accumulates and stores the number of "DPLL" errors on the DPLL error on the forward forward loop side for the optical loop, or the number of "DPLL"...
Page 328 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Stores the cause and status of the loop switch. Whether the data should be overwritten or retained is set in the common parameters.
Page 329 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Accumulates and stores the number of transient transmission Transient transmission SW00EE errors.
Page 330 APPENDIX MELSEC-Q Table 2 Link special register (SW) list (Continued) Use permitted/prohibited Remote Control Normal Remote I/O master Name Description station station station station Optical Coaxial Optical Coaxial Optical Coaxial Optical Coaxial Indicates the operation mode of each station's CPU. 0: Backup mode (including stations exceeding the maximum station number and reserved stations) SW01F4...
Page 331: Appendix 4 Special Relay (Sm) For Remote I/O Modules List
APPENDIX MELSEC-Q Appendix 4 Special Relay (SM) for Remote I/O Modules List Special relays SM are internal relays whose specifications are decided by the CPU and remote I/O module. For this reason, they cannot be used by sequence programs in the same way as the normal internal relays. However, they can be turned ON or OFF as needed in order to control the CPU and remote I/O modules.
Page 332 APPENDIX MELSEC-Q Special Relay List (1) Diagnostic Information Corresponding Set by Applicable Number Name Meaning Explanation ACPU (When Set) • ON if diagnosis results show error occurrence OFF: No error (Includes external diagnosis) Diagnostic errors S (Error) ON : Error •...
Page 333: Appendix 5 Special Register (Sd) For Remote I/O Module List
APPENDIX MELSEC-Q Appendix 5 Special Register (SD) for Remote I/O Module List Special registers SD are internal registers whose specifications are decided by the CPU and remote I/O module. For this reason, they cannot be used by sequence programs in the same way as the normal internal registers. However, they can be used to write data as needed in order to control the CPU and remote I/O modules.
Page 334 APPENDIX MELSEC-Q Special Register List (1) Diagnostic Information Set by Corresponding Corresponding Number Name Meaning Explanation (When ACPU set) Diagnostic Diagnosis • Error codes for errors found by diagnosis are stored as BIN data. D9008 format S (Error) errors error code •...
Page 335 APPENDIX MELSEC-Q Special Register List (Continued) Set by Corresponding Corresponding Number Name Meaning Explanation (When ACPU set) • Common information corresponding to the error codes (SD0) is stored here. • The following four types of information are stored here: Slot No. Meaning Number Slot No./PLC No.
Page 336 APPENDIX MELSEC-Q Special Register List (Continued) Set by Corresponding Corresponding Number Name Meaning Explanation (When ACPU set) Time (value set) Meaning Number Time : 1 µs units (0 to 999 µs) Time : 1 ms units (0 to 65535 ms) SD10 SD10 SD11...
Page 337 APPENDIX MELSEC-Q Special Register List (Continued) Set by Corresponding Corresponding Number Name Meaning Explanation (When ACPU set) • Individual information corresponding to error codes (SD0) is stored here. SD16 File name/Drive name (Example) File name= Number Meaning ABCDEFGH. IJK SD16 Drive B15 to B8 B7 to B0 SD17...
Page 338 APPENDIX MELSEC-Q Special Register List (Continued) Corresponding Set by Corresponding Number Name Meaning Explanation ACPU (When set) Error number that • Stores error number that performs error reset SD50 Error reset + Rem performs error reset • Each time the voltage falls below 85% of normal (AC power/65% AC DOWN AC DOWN Number DC power) while the CPU module is calculating, it will be saved...
Page 339 APPENDIX MELSEC-Q Special Register List (2) System information Corresponding Set by Corresponding Number Name Meaning Explanation ACPU (When set) • The switch status of the remote I/O module is stored in the following format. B4 B3 S (Always) Remote Vacant Remote I/O module switch status Always 1: STOP •...
Page 340 APPENDIX MELSEC-Q Special Register List (Continued) Corresponding Set by Corresponding Number Name Meaning Explanation ACPU (When set) • The operating status of the remote I/O module is stored in the following format. B4 B3 S (Always) Remote Vacant Remote I/O module operating status Always 2: STOP •...
Page 341 APPENDIX MELSEC-Q Special Register List (Continued) Corresponding Set by Corresponding Number Name Meaning Explanation ACPU (When set) 0: Automatic mode SD240 Base mode • Stores the base mode. S (Initial) 1: Detail mode : Main only No. of 1 to 7: No. of SD241 extension •...
Page 342 APPENDIX MELSEC-Q Special Register List (Continued) Corresponding Set by Corresponding Number Name Meaning Explanation ACPU (When set) No. of modules SD340 • Indicates the number of modules installed on Ethernet. installed SD341 I/O No. • Ethernet I/O No. of the 1st module installed. Network SD342 •...
Page 343 APPENDIX MELSEC-Q (4) Fuse blown module Corresponding Set by Corresponding Number Name Meaning Explanation ACPU (When set) SD1300 • The numbers of output modules whose fuses have blown are D9100 input as a bit pattern (in units of 16 points). SD1301 D9101 (If the module numbers are set by parameter, the parameter-set...
Page 344: Appendix 6 Discontinued Models That Can Be Mounted On Remote I/O Stations
APPENDIX MELSEC-Q Appendix 6 Discontinued Models that can be Mounted on Remote I/O Stations Some of disontinued Q series models are applicable to remote I/O stations. Note that restrictions apply to the following modules. Module model Description QJ71E71 • Function version B or later is applicable. •...
Page 345: Appendix 7 External Dimensions
APPENDIX MELSEC-Q Appendix 7 External Dimensions (1) QJ71LP21-25, QJ71LP21G, QJ71LP25GE 27.4 Unit: mm App - 41 App - 41...
Page 346 APPENDIX MELSEC-Q (2) QJ71LP21S-25 55.2 Unit: mm App - 42 App - 42...
Page 347 APPENDIX MELSEC-Q (3) QJ71BR11 11.2 27.4 Unit: mm App - 43 App - 43...
Page 348 APPENDIX MELSEC-Q (4) QJ72LP25-25, QJ72LP25G, QJ72LP25GE 27.4 Unit: mm App - 44 App - 44...
Page 349 APPENDIX MELSEC-Q (5) QJ72BR15 27.4 Unit: mm App - 45 App - 45...
Page 350 APPENDIX MELSEC-Q MEMO App - 46 App - 46...
Page 351 INDEX Communication test ........4-27 Block guarantee per station ......6-6 Host information ...........8-4 Setup confirmation test ......4-25 Other station information......8-6 Coaxial cable ........... 3-4 Loop test.............4-22 Common parameter Network setting LX/LY setting ..........5-9 Start I/O No...........5-6 LB/LW setting ..........5-11 Network No...........5-6 Reserved station designation....
Page 352 Special register (SD) for remote I/O station ..........App-29 Special relay (SM) for remote I/O station ..........App-27 Supplemental setting........5-14 Switch setting Station setting switch......4-2,4-5 Mode setting switch....... 4-2,4-5 Test Self-loopback test ........4-10 Forward loop/reverse loop test ....4-20 Internal self-loopback test ......
Page 353 WARRANTY Please confirm the following product warranty details before using this product. 1. Gratis Warranty Term and Gratis Warranty Range If any faults or defects (hereinafter "Failure") found to be the responsibility of Mitsubishi occurs during use of the product within the gratis warranty term, the product shall be repaired at no cost via the sales representative or Mitsubishi Service Company.
Page 354 Microsoft Windows, Microsoft Windows NT are registered trademarks of Microsoft Corporation in the United States and other countries. Pentium is a registered trademark of Intel Corporation in the United States and other countries. Ethernet is a registered trademark of Xerox. Co., Ltd in the United States. countries. Other company and product names herein are either trademarks or registered trademarks of their respective owners.
Page 356 Q Corresponding MELSECNET/H Network System Reference Manual (Remote I/O network) Q-NET/H-R-I/O-E MODEL MODEL 13JF96 CODE SH(NA)-080124-F(0406)MEE HEAD OFFICE : 1-8-12, OFFICE TOWER Z 14F HARUMI CHUO-KU 104-6212,JAPAN NAGOYA WORKS : 1-14 , YADA-MINAMI 5-CHOME , HIGASHI-KU, NAGOYA , JAPAN When exported from Japan, this manual does not require application to the Ministry of Economy, Trade and Industry for service transaction permission.

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Mitsubishi Electric QJ71LP21 Reference Manual

1 Overview

2 System Configuration

3 Specifications

4 Setup and Procedures before Starting the Operation

5 Parameter Settings

6 Programming

7 Application Functions

8 Troubleshooting

Appendix

Appendix 1 Precautions When Changing over from a MELSECNET/10 Remote I/O Network to a MELSECNET/H Remote I/O Network

Appendix 2 Link Special Relay (SB) List

Appendix 3 Link Special Register (SW) List

Appendix 4 Special Relay (SM) for Remote I/O Modules List

Appendix 5 Special Register (SD) for Remote I/O Module List

Appendix 6 Discontinued Models that Can be Mounted on Remote I/O Stations

Appendix 7 External Dimensions

Quick Links

Troubleshooting

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Summary of Contents for Mitsubishi Electric QJ71LP21

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Table of Contents