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ErrorLib — Industrial Fault Code Library

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1 (Argument: 9)

Invalid Checksum in Serial EEPROM

Wago · PFC200 PLC

What does 1 (Argument: 9) mean?

An invalid checksum has been detected in the serial EEPROM. This indicates data corruption within the EEPROM, which typically stores critical configuration or operational parameters, leading to system instability or failure to boot correctly.

Common Causes

  • Data corruption in the serial EEPROM.
  • EEPROM hardware fault causing data read errors.
  • Voltage fluctuations or power disturbances affecting EEPROM write operations.

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