6

I/O Module Configuration Mismatch After Data Bus Reset

Wago · PFC200 PLC

What does 6 mean?

The detected I/O module configuration following an internal data bus reset does not match the configuration that was present after the last controller startup. This suggests a transient issue with the I/O bus communication or a configuration inconsistency requiring a controller restart.

Common Causes

  • Transient internal data bus communication error leading to configuration discrepancy
  • Temporary I/O module configuration discrepancy detected after an internal data bus reset
  • Software or hardware glitch causing an unexpected internal data bus reset

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Restart the controller by first switching off the power supply and then switching it back on.

  2. 2

    Alternatively, press the Reset button located on the controller.

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Verified technical data. Last updated: March 2026

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