In industrial automation troubleshooting, many engineers have experienced this frustrating situation: You press the button on the HMI, the status inside the monitoring screen changes correctly, and the PLC logic even shows the output signal is ON — but the relay does not pull in, the motor does not run, or the valve refuses to […]
Tag Archives: PLC troubleshooting
Introduction Have you ever encountered this situation? Your PLC program runs perfectly in simulation. Logic checks out. No alarms. Everything seems correct.But once you download the program to the real machine… nothing happens. The motor doesn’t start. The cylinder doesn’t move. Only the PLC indicators are blinking. This is one of the most common — […]