328 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 7 Move/Logical Instructions (MOV, MVM, BTD, MVMT, BTDT, CLR, SWPB, AND, OR, XOR, NOT, BAND, BOR, BXOR, BNOT)
FBD_LOGICAL Structure
Description: When enabled, the instruction evaluates the NOToperation.
If you mix integer data types, the instruction fills the upper bits of the smaller integer data
types with 0s so that they are the same size as the largest data type.
Arithmetic Status Flags: Arithmetic status flags are affected.
Fault Conditions: None
Execution:
Relay Ladder
Input Parameter Data Type Description
EnableIn BOOL Enable input. If cleared, the instruction does not execute and outputs are not updated.
default is set
Source DINT Value to NOT.
valid = any integer
Output Parameter Data Type Description
EnableOut BOOL The instruction produced a valid result.
Dest DINT Result of the instruction. Arithmetic status flags are set for this output.
If the bit in the
Source is
The bit in the
destination is
01
10
Condition Action
Prescan The rung-condition-out is set to false.
Rung-condition-in is false The rung-condition-out is set to false.
Rung-condition-in is true The instruction performs a bitwise NOT operation.
The rung-condition-out is set to true.
Postscan The rung-condition-out is set to false.
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