An HMI may still power on and display its interface while losing communication with the PLC. Typical symptoms include values not updating, control buttons not responding, or a communication error appearing on the screen.
When this happens, the HMI itself is not necessarily the problem. The...
I’m looking into an AC Servo system that is showing an AL009 alarm, and the motor cannot run normally.
The main symptoms are:
- AL009 appears on the Servo Driver
- The motor does not rotate
- Servo ON may not be completed
- The alarm can return after being reset
- In some cases, the problem...
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