Mitsubishi Electric MELSEC-Q Series Programming Manual page 49

Block STOP processing
Make a block STOP using the STOP/RESTART bit of the SFC information devices or the block STOP instruction of the SFC
control instructions. The processing of the active step in the block where a block STOP was made is as described below.
■When the "block STOP-time operation output flag (SM325)" is OFF (coil output OFF)
• The step becomes inactive when the processing of the corresponding block is performed first after a block STOP request.
• All coil outputs turn OFF. However, the coils turned ON by the SET instruction remain ON.
■When the "block STOP-time operation output flag (SM325)" is ON (coil output held)
The coil outputs remain ON during a block STOP and after a block RESTART.
Precautions when designating coil HOLD steps
• When the execution condition of the PLS instruction is satisfied and the transition condition is satisfied at the same scan
where the PLS instruction was executed, the device turned ON by the PLS instruction remains ON until the OFF condition
in above (3) is satisfied.
• When the execution condition of the PLF instruction is satisfied and the transition condition is satisfied at the same scan
where the PLF instruction was executed, the device turned ON by the PLF instruction remains ON until the OFF condition
in above (3) is satisfied.
• If the count input condition turns ON/OFF after a transition to the next step, the counter does not start counting.
• When a step transition occurs after the transition condition is satisfied with the coil of the timer ON, the timer stops timing
and holds the then present value.
4 SFC PROGRAM CONFIGURATION
4.2 Steps
4
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