EFB fault 2

What does 6685 mean?

This is a generic fault reserved for the embedded fieldbus (EFB) protocol application, indicating an unspecified error within the EFB communication stack or protocol execution. The precise cause and resolution are dependent on the specific fieldbus protocol implemented.

Complete Troubleshooting Guide

1. 1

   Consult the detailed documentation for the specific EFB protocol being used (e.g., Modbus RTU, Profibus DP) to interpret the meaning of 'EFB fault 2'.

2. 2

   Check recent changes in the fieldbus network or master device that might trigger this protocol-specific error.

3. 3

   If the documentation does not provide clear guidance, contact your local ABB representative.