ABB REF542plus - Troubleshooting REF542 plus Issues; Error Messages and Solutions

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15. Troubleshooting
15.1. Error messages
Base Unit not responding, communication corrupted or
wrong slave address
When the HMI is not able to communicate with the Base Unit, the following
information appears on the LCD:
A051367
Fig. 15.1.-1 HMI is not able to communicate with the Base Unit
Solution:
Check that the Base Unit is powered and regularly working. Look at the
status LED on the connector panel (Slot X7).
The LED close to the analog inputs is related to the watchdog. When the Base
Units is working this LED is on with a weak light.
The other LED is related to the communication with the HMI. When the
communication is properly working, this LED is blinking. When the
communication is not working, the LED can be either ON or OFF. It depends
on when the communication is interrupted.
Check that the connection cable between the HMI and the Base Unit is
inserted both in the HMI and in the Base Unit (Base Unit connector X12D)
and properly tighten.
Check the slave address of the connected Base Unit to be polled. The address
is configured in the application file. If you do not know you can enter the
following page by pressing ENTER.
1MRS755869
Multifunction Protection and Switchgear Control
Unit
Operator's manual
REF542plus