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Sequence Input Instructions Section 3-2
Example
3-2-2 LOAD NOT: LD NOT
Purpose Indicates a logical start and creates an ON/OFF execution condition based on
the reverse of the ON/OFF status of the specified operand bit.
Ladder Symbol
Variations
Applicable Program Areas
Instruction Operand
LD 0.00
LD 0.01
LD 0.02
AND 0.03
OR LD ---
AND LD ---
LD NOT 0.04
AND 0.05
OR LD ---
OUT 100.00
100.00
0.00 0.01
0.02 0.03
0.04
0.05
OR LD
AND LD
OR LD
Bus bar
Starting point of bloc
Variations Restarts Logic and Creates ON Each Cycle Operand
Bit is OFF
LD NOT
Restarts Logic and Creates ON Once for Upward
Differentiation
@LD NOT
Restarts Logic and Creates ON Once for Downward
Differentiation
%LD NOT
Immediate Refreshing Specification !LD NOT
Combined
Variations
Refreshes Input Bit, Restarts Logic, and Creates ON
Once for Upward Differentiation
!@LD NOT
Refreshes Input Bit, Restarts Logic, and Creates ON
Once for Downward Differentiation
!%LD NOT
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
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