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If a contact identical to the MC instruction trigger begins from the mother line inside MC-MCE and a DF instruction exists immediately to the right, that contact won't be able to be differentiated even if the trigger.

ID:
772
Issued:
Dec 25th, 2009
Updated:
May 17th, 2013

If a contact identical to the MC instruction trigger (execution condition) begins from the mother line inside MC-MCE and a DF instruction exists immediately to the right, that contact won't be able to be differentiated even if the trigger (execution condition) turns on.

ANSWER
The DF instruction detects a rise when the previous OFF execution result is stored and the current execution result is ON. (The opposite applies for DF/.) In this program, although the DF instruction inside MC-MCE does not execute when the MC instruction execution conditions are first established after running, since there is no ON/OFF information from the previous execution, R100 does not turn ON because the rise cannot be detected.
Also, even when there are two or more subsequent MC instruction executions, if RO was on during the last scan when the previous MC instruction was executed, R100 will not turn on because the rise cannot be detected.
However, for only the FP2, FP2SH and FP10SH, detection will always occur when the checkmark in the item below is removed in the system register settings.
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