M8013 Mitsubishi: Plc

----[ M8013 ]----[PLS M10]----[MOV D100 D200] // Log every second Do not use M8013 for critical timing or safety functions.

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

----[ M8013 ]--------------( M100 ) // Heartbeat bit On the HMI, animate an invisible shape or text color based on M100. If the blinking stops, the operator knows the PLC is in STOP mode or has faulted. Mechanical pushbuttons and limit switches bounce for 5–20ms. A common trick: sample the input every 500ms using M8013. ----[ M8013 ]----[PLS M10]----[MOV D100 D200] // Log

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 the blinking stops, the operator knows the