Move/Logical Instructions

Move/Logical Instructions

The Move instructions modify and move bits.
Available Instructions
Ladder Diagram
Function Block Diagram
FBD Block
FBD Function
BOR__function
Structured Text
If you want to:
Use this instruction:
Copy a value or move strings
MOVE
Copy a specific part of an integer
MVM
Copy a specific part of an integer in a function block
MVMT
Move bits within an integer or between integers
BTD
Move bits within an integer or between integers in a function block
BTDT
Clear a value
CLR
Rearrange the bytes of an INT, DINT, or REAL tag
SWPB
The logical instructions perform logical operations on bits.
If you want to:
Use this instruction:
Perform a bitwise AND operation
AND
Perform a bitwise OR operation
OR
Perform a bitwise, exclusive OR operation
XOR
Perform a bitwise NOT operation
NOT
You can mix data types, but loss of accuracy and rounding error might occur and the instruction takes more time to execute. Check the S:V bit to see whether the result was truncated.
The
bold
 data types indicate optimal data types. An instruction executes faster and requires less memory if all the operands of the instruction use the same optimal data type, typically DINT or REAL.
A move/logic instruction executes once each time the instruction is scanned as long as the rung-condition-in is true. If you want the expression evaluated only once, use any one-shot instruction to trigger the move/logic instruction.
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