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.

Complete Troubleshooting Guide

1. 1

   Verify the integrity of the communication cable, checking for breaks, loose connections, proper shielding, and correct termination resistors at both ends of the bus.

2. 2

   Confirm all communication parameters (e.g., baud rate, parity, address, protocol settings) in parameter F6-01 and the connected master device are correctly configured and match.

3. 3

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

4. 4

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

5. 5

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