That is incorrect Vince, the rungs of code within an MCR "zone" are still executed, but effectively with the "power-rail" turned OFF. That has the effect of turning off all non-retentive outputs, resetting all TON's, start TOF's timing, etc., etc.
If you really want to ignore sections of code, use JMP/LBL, that truly does ignore the jumped rungs.
Ah, okay. Thanks for the advice, I will use that from now on.