Serious SERCOS error with return into phase 0.

What does 841 mean?

A serious error occurred during SERCOS startup, forcing the NC to revert to SERCOS phase 0. Possible causes include telegram failure, handshake timeout, busy timeout in the service channel, or incorrect transmission time adjustments. This is a servo loop or drive fault, indicating critical communication issues.

• Telegram failure during SERCOS startup.
• Handshake timeout in the service channel.
• Busy timeout in the service channel.
• Wrong adjustment of SERCOS transmission times.

Click steps to track your progress.

1. 1

   Check drives connected to the SERCOS ring for proper operation.

2. 2

   Verify all SERCOS ring connections are secure and intact.

3. 3

   Review and correct the parameterization of the SERCOS ring.

4. 4

   Initiate a new SERCOS startup after verifying components.