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4.2.7
Logical NOT
When the Logical Not or Logical Invert (NOT) function receives power flow, it sets the state of each
bit in the output bit string Q to the opposite of the state of the corresponding bit in bit string IN1.
All bits are altered on each scan that power is received, making output string Q the logical
complement of input string IN1. Logical NOT passes power flow to the right whenever it receives
power. You can specify a string length of 1 to 256 WORDs or DWORDs
Operands for Logical NOT
Parameter
Length (??)
IN1
Q (Must be the same data
type as IN1)
Example
When input V_I0001 is set, the bit string represented by the variable A is negated. Logical NOT stores
the resulting inverse bit string in variable B. Variable A retains its original bit string value.
GFK-2950C
Description
The number of WORDs or DWORDs in
the bit string to NOT. 1 Length
256.
The first WORD or DWORD of the
input string to NOT.
The first WORD or DWORD of the
NOT's result.
February 2018
Chapter 4. Ladder Diagram (LD) Programming
Allowed Operands
Constant
All
All except constants and
variables located in %S memory
Optional
No
No
No
77
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