Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 473
Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT) Chapter 11
No Operation (NOP)
The NOP instruction functions as a placeholder.
Operands:
Relay Ladder
None
Description: You can place the NOP instruction anywhere on a rung. When enabled the NOP
instruction performs no operation. When disabled, the NOP instruction
performs no operation.
Arithmetic Status Flags: Not affected
Fault Conditions: None
Execution:
Example This instruction is useful for locating unconditional branches when you place the
NOP instruction on the branch.
The NOP instruction bypasses the XIC instruction to enable the output.
Condition Relay Ladder 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 rung-condition-out is set to true.
Postscan The rung-condition-out is set to false.
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