Error description 320-07D4

Error message

Supply voltage missing at X44

Cause of error

No supply voltage is applied at connector X44 of the control (= Relay external DC voltage missing).
Possible causes:
- PLC fuses defective
- 24V power supply unit in the electrical cabinet defective
- Faulting wiring of 24 V supply
- Lines interrupted

Error correction

- Check the PLC fuses
- Check the 24 V power supply unit in the electrical cabinet
- Check the wiring of the 24 V supply
- Check the lines for interruption