Problem & answerH-10
PLC Communication Error
Likely causes
- Communication cable disconnected or damaged
- PLC powered off
- Network fault
- HMI communication failure
How to fix it
- 1Check PLC power.
- 2Inspect the communication cable; replace if damaged.
- 3Restart the PLC and HMI.
- 4Verify communication settings.
It is fixed when
HMI communicates normally with the PLC.
Stop it coming back
- Inspect communication cables monthly.
Did this solve the problem?