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ErrorLib — Industrial Fault Code Library

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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.

Browse all codes in this manual (23)
Verified technical data. Last updated: April 2026

Related Faults

--Internal Data Bus Communication Error (Unidentified Module)0x00090003Modbus Slave TCP Start Failed0x00090006Modbus Slave UDP Start Failed
Source: Wago PFC200 PLC
Open Manual (Page 198)Search more codes in this manual