Manual

Publication LOGIX-UM001B-EN-P - April 2010 87
Equipment Phase Instructions (PSC, PCMD, POVR, PFL, PCLF, PXRQ, PRNP, PPD, PATT, PDET) Appendix A
Execution:
Condition Relay Ladder Action Structured Text Action
prescan The rung-condition-out is set to false. No action taken.
rung-condition-in is false The rung-condition-out is set to false. N/A
rung-condition-in is true • When the rung-condition-in goes from false to
true, the instruction executes one time.
• The rung-condition-out is set to true.
N/A
scan of structured text N/A In structured text, instructions execute each time
they are scanned. To limit the scan of an instruction,
use a qualifier of an SFC action and/or a structured
text construct.
instruction execution The instruction sends the specified request to
FactoryTalk Batch software.
The instruction sends the specified request to
FactoryTalk Batch software.
postscan The rung-condition-out is set to false. No action taken.