Communication Bus Fault

What does BUS mean?

A BUS fault indicates an issue with the communication option board installed in the drive. This occurs when there's a problem with the drive's ability to communicate over its industrial network (e.g., Modbus, Ethernet/IP, Profibus). This can be caused by wiring errors, incorrect communication settings, or a hardware failure of the option board itself. Loss of communication means the drive cannot receive commands or send status updates via the network, potentially stopping operations.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the status LEDs on the communication option board for diagnostic indications as specified in the option board manual.

2. 4

   Ensure the communication option board is properly and securely seated in its slot within the drive's control section.

3. 5

   Review parameter b1-01 or b1-02 if communication control is enabled, ensuring the drive is configured to respond to network commands.