CAN Bus-Off State

What does ce4 mean?

The controller has entered a 'Bus-Off' state, meaning it has detected and received too many faulty telegrams on the system bus and has consequently disconnected itself. This indicates severe bus communication issues, such as incorrect termination, poor shielding, or excessive bus load. Being 'Bus-Off' means the controller cannot communicate, halting operations.

Complete Troubleshooting Guide

1. 1

   Verify that the CAN bus termination resistors are correctly installed and configured.

2. 2

   Check the shield connection of all CAN bus cables for proper grounding and integrity.

3. 3

   Ensure the protective earth (PE) connection for the controller and bus components is secure.

4. 4

   Assess the bus load and, if necessary, reduce the baud rate to improve communication reliability.