A7CE warning in ABB DCS880 drive indicates EFB communication error. This means cyclical communication to the embedded fieldbus (EFB) is lost.

1. Check the status of the fieldbus master (online, offline, error etc.).
2. Check the settings of group 58 FBA Embedded fieldbus.
3. Check the cable connections to connector XD2D on the control board.
4. Check the fieldbus termination.