1 (Argument: 11)

Serial EEPROM Read Error

Wago · PFC200 PLC

What does 1 (Argument: 11) mean?

An error occurred while reading from the serial EEPROM. This indicates that the controller cannot reliably retrieve data from its non-volatile memory, which is essential for configuration and operation, potentially leading to incorrect behavior or system failure.

Common Causes

  • Hardware malfunction of the serial EEPROM chip.
  • Intermittent connection or faulty wiring to the EEPROM.
  • Data corruption within the EEPROM memory cells.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Switch off the power supply to the controller.

  2. 2

    Reduce the number of I/O modules connected.

  3. 3

    Switch the power supply back on to the controller.

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Verified technical data. Last updated: March 2026

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