K-bus Output Update Not Complete (TwinCAT)

What does State Variable Bit 10 mean?

The K-bus State variable in TwinCAT has Bit 10 set, indicating that the K-bus output update cycle has not yet completed. This can result in outputs not being set or updated as expected by the PLC program.

• K-bus output data update cycle not completed within the expected time.
• Interruption in the output data writing process.
• Slow response for output actuation.
• TwinCAT task scheduling issue affecting output updates.

Click steps to track your progress.

1. 1

   Evaluate the TwinCAT task time configured for the K-bus. Ensure the task time is sufficiently fast (recommended less than 50 ms) to allow for complete output updates.

2. 2

   Check for high system loading or excessive data traffic on the K-bus that might be delaying the completion of output update cycles.