Manual

90 Publication LOGIX-UM001B-EN-P - April 2010
Appendix A Equipment Phase Instructions (PSC, PCMD, POVR, PFL, PCLF, PXRQ, PRNP, PPD, PATT, PDET)
Execution:
Example:
Relay Ladder
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 • The instruction executes.
• 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 clears the NewInputParameters bit
of the equipment phase.
The instruction clears the NewInputParameters bit
of the equipment phase.
postscan The rung-condition-out is set to false. No action taken.
If ThisPhase.NewInputParameters = 1 (FactoryTalk Batch software has new input parameters for the equipment phase), then
DataValues[0] = 2. This sets the PXRQ instruction for transfer of control.
Send the Download Input Parameters Subset request to FactoryTalk Batch software. Because DataValues[0] =2,the
instruction is set for transfer of control.
When RQ_Control[0].PC = 1 (The PXRQ instruction is done.), then
ThisPhase.NewInputParameters = 0 via the PRNP instruction.