M8039 – If its coil is energized, the PLC will operate according to the scan time specified in D8039. I-GX Works2 Advanced fod00144 tha 2.2. 1-2 1.1 Configuration of the Training Machine (FX5U-32MT-SIM) 1.1. M8034 – If the coil is energized, the output of the PLC is completely disabled. M8033 – If its coil is energized, the output image memory and data register contents are maintained when the PLC is stopped. The PLC performs a specific action after the coil is driven by the user program. M8011, M8012, M8013, and M8014 generate clock pulses of 10ms, 100ms, 1s, and 1min, respectively. Furthermore, for the online operations performed from a personal computer to a programmable controller CPU, the corrective actions against a communication error. 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. Sometimes this gets corrupted and doesnt let you open the project until you manually go to the project location and delete the lock file. M8000-Operation monitors normally open contacts, and the PLC is always ON when it is running. Not overly familiar with GX Works bit I know wonderware creates a lock file to only alllow one user to edit the program at a time. 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.