ABB ACS320 - Embedded Fieldbus Faults; No Master Device; Same Device Address; Incorrect Wiring

Fault tracing 375
Embedded fieldbus faults
Embedded fieldbus faults can be traced by monitoring group Group 53: EFB protocol
parameters. See also fault/alarm SERIAL 1 ERR.
 No master device
If there is no master device on line, parameter 5306 EFB OK MESSAGES and 5307
EFB CRC ERRORS values remain unchanged.
What to do:
• Check that the network master is connected and properly configured.
• Check the cable connection.
 Same device address
If two or more devices have the same address, parameter 5307 EFB CRC ERRORS
value increases with every read/write command.
What to do:
• Check the device addresses. No two devices on line may have the same address.
 Incorrect wiring
If the communication wires are swapped (terminal A on one device is connected to
terminal B on another device), parameter 5306 EFB OK MESSAGES value remains
unchanged and parameter 5307 EFB CRC ERRORS increases.
What to do:
• Check the RS-232/485 interface connection.