M8013 Mitsubishi | Plc

At first glance, it looks like just another auxiliary relay. But in the world of industrial automation, M8013 holds a special place. It is often the first clock pulse a trainee learns, and the last debug tool an experienced engineer reaches for.

If you have ever opened Mitsubishi’s GX Works2 or GX Developer software to program an FX series PLC, you have likely stumbled upon a mysterious internal relay: M8013 . m8013 mitsubishi plc

Because M8013 is tied to the PLC’s scan cycle, its timing can drift slightly if you have a very long program (e.g., >50ms scan time). For precise timing (motor acceleration ramps, PID loops, safety cutoffs), use the dedicated T timers or high-speed counters. At first glance, it looks like just another auxiliary relay