M8003 – Initialize pulse normally closed contact, OFF one scan cycle when PLC is running. M8002 – Initialize pulse normally open contact, ON one scan cycle when PLC is running. M8001-Operation monitors normally closed contacts, and the PLC keeps OFF when it is running. M8000-Operation monitors normally open contacts, and the PLC is always ON when it is running. If you want to know more, you need a programming manual. There are other special auxiliary relays, which are commonly used. It is a time pulse with periods of 10ms, 100ms, 1000ms (one second), m8020, m8021, m8022, which are standard real bits, representing benefits, zeros, and endings. When plc is just started, it closes a cycle, but 8001 is normally closed, 8002 is normally open, m8011, 8012, 8013. m8001 and m8002 are initialization pulses. PLC M8000-M8990 is a special internal relay of Mitsubishi PLC.
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