mitsubishi plc special relays include M8000 …M8008 M8011….M8019 M8020….M8029 M8030…M8039 Different functions of different special relays serve MITSUBISHI PLC at the same time.
here have some mitsubishi plc special relays example you can see
RUN monitoring M8000, M8001
RUN monitoring (M8000, M8001) which shows the running state of PLC can be used as the driving condition of instructions and the external display of “display in normal operation”
RUN is in ON state when normal, and Y0 leads.
M8001 is in OFF state when RUN is normal.
Initial pulse M8002, M8003
M8003 is OFF only at one instant (one operation cycle) after the start of PLC operation, and the rest of the time is in ON state.
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