Panasonic FP7 Series Command Reference Manual page 183

3.25 MC (Master Control Relay), MCE (Master Control Relay End)
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Precautions for Programming
● A pair of the MC and MCE instructions can be nested within another pair of the MC and MCE
instructions. (Up to 30 levels of nesting are allowed for MC and MCE.)
WUME-FP7CPUPGR-12 3-79