Cause : FBA A parameter conflict comes when the drive does not have a functionality requested by PLC, or requested functionality has not been activated.

The fault code 65A1 in your ABB ACS880 drive indicates a parameter conflict between the PLC and the drive. This means the drive detected a mismatch between the control signals it's receiving from the Programmable Logic Controller (PLC) and the functionalities it has enabled within its own parameters.

1. Check PLC programming.
2. Check settings of parameter groups 50 Fieldbus adapter (FBA) and 51 FBA A settings.