MC PLC Mitsubishi :
MC - Master Control.
After the execution of an MC instruction, the bus line (LD, LDI point) shifts to a point after the MC instruction.
MCR PLC Mitsubishi :
MCR - Master Control Reset.
An MCR instruction returns this to the original bus line.
MC and MCR at GX Developer Write Mode for PLC Mitsubishi :
MC and MCR at GX Developer Monitor Mode for PLC Mitsubishi :
See : Simulation Make MC and MCR