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Bit-shift instructions
ROR
ROR rotates a defined number (N) of bits to the right.
Description
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
Source register
Bit
DT0
Target register
Bit
DT0
Availability of ROR (see page 1330)
PLC types
Data types
Data type
ANY_BIT
In this example, the same POU header is used for all programming languages. For an example
Example
using IL (instruction list), please refer to the online help.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
This example uses variables. You can also use a constant for the input variable.
Body
The first N bits (here N = 4) of source_register are right-rotated. The result will be written into
target_register.
98
Rotate N bits the right
15
12
11
8
7
. .
. .
. .
0 0 0 1
0 0 1 0
0 0 1 1
15
12
11
8
7
. .
. .
. .
0 1 0
0
0 0 0 1
0 0 1 0
I/O
Function
1st input
input value
2nd input
number of bits by which the input value is rotated to the right
output as input
result
The number of steps may vary depending on the PLC and parameters used, see
also Table of Code Intensive Instructions in the online help.
(n = 4 bits)
4
3
0
. .
0
1 0
0
4
3
0
. .
0 0 1 1
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