1 (Argument: 12)

Serial EEPROM Access Timeout

Wago · PFC200 PLC

What does 1 (Argument: 12) mean?

The time allocated to access the serial EEPROM was exceeded. This indicates a failure to read from or write to the EEPROM within the permissible time limit, potentially due to a hardware fault in the EEPROM or a communication issue on the controller's internal bus.

Common Causes

  • Hardware malfunction of the serial EEPROM causing slow or unresponsive behavior.
  • Issues with the controller's internal bus or EEPROM interface.
  • Severe data corruption that hinders timely access.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Switch off the power to the controller.

  2. 2

    Replace the controller.

  3. 3

    Switch the power back on to the controller.

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Verified technical data. Last updated: March 2026

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