Periodic Execution Block Replacement Method - Mitsubishi Electric MELSEC-Q Series Programming Manual

Periodic Execution Block Replacement Method

Operation of periodic execution block
A periodic execution block is executed in each scan where the specified execution interval has elapsed. The following figure
shows the operation performed when blocks 0, 1, 2, 10 and 11 are used and blocks 10 and 11 are set as the periodic
execution blocks.
Periodic execution block replacement method
When the execution interval measured by the timer in the sequence program reaches the set time, the specified block is
activated by the STOP/RESTART bit. When the set time is not reached, the block is in a stop status. To hold the output also
when the block is in a stop status, select "Change OUT instruction in specified block to SET instruction" or "Coil output held for
stop-time output mode".
APPENDICES
182
Appendix 2 Restrictions on Basic Model QCPU, Universal Model QCPU, and LCPU and Alternative Methods