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Reset Ibb Error in ABB Ref 542plus
The LED 'Ibb error' in HMI of ABB Ref 542plus stay red when i reset the modbus communication board.

I've red LED 'Ibb error' in HMI of ABB Ref 542plus. When I reset the Modbus communication board in the first and the second Ref 542plus the LEDs 'Ibb error' becomes green. In the third Ref 542plus it becomes green a few seconds and becomes red. I reset several times but the LED stay red. When I checked the communication board LEDs:

The first LED (communication board monitoring) blink 0.5 seconds period, the second LED (Rx) off, the third LED (Tx) blink.

in the first and second communication board:
The first LED (communication board monitoring) blink 2 seconds period, the second LED (Rx) blink, the third LED (Tx) blink.

Any solutions? you can contact me: begou6@gmail.com

thank you