EFB fault 3

What does 6686 mean?

This is another generic fault reserved for the embedded fieldbus (EFB) protocol application, indicating an unspecified error within the EFB communication stack or protocol execution. Like EFB fault 2, its exact meaning is dependent on the specific fieldbus protocol in use.

• Sustained fieldbus network issue, such as intermittent cabling fault, poor termination (e.g., missing 120 Ohm resistors).
• EFB module experiencing an internal watchdog timeout due to a processing loop or resource contention.
• Fieldbus master repeatedly querying non-existent drive parameters or memory addresses, causing EFB module instability.
• Incompatible GSD/GSDML file loaded into the fieldbus master for the specific EFB module or drive model.
• Internal hardware fault on the EFB module that prevents stable protocol execution.

Click steps to track your progress.

1. 1

   Power cycle the drive and observe if the fault immediately returns.

2. 2

   Inspect fieldbus cabling for damage, proper routing away from power cables, and correct termination resistor presence and value.

3. 3

   Use a fieldbus diagnostic tool to check network topology, cable integrity, and signal levels on the bus.

4. 4

   Verify the GSD/GSDML file used in the fieldbus master matches the exact drive model and EFB option module revision.

5. 5

   Attempt to replicate the fault by performing specific read/write operations from the fieldbus master to identify a problematic data point.