7
Serial EEPROM Write Error
Wago · PFC200 PLC
What does 7 mean?
An error occurred during an attempt to write data to the controller's serial EEPROM. This critical fault indicates a problem with the non-volatile memory used for storing persistent data or configuration, which could lead to data loss or improper operation.
Common Causes
- Defective serial EEPROM hardware within the controller
- Internal controller hardware fault preventing EEPROM write operations
- Power supply interruption or instability during EEPROM write operation
Repair Steps & Checklist
Click steps to track your progress.
- 1
Switch off the power to the controller.
- 2
Replace the controller.
- 3
Switch the power back on after replacement.
Verified technical data. Last updated: March 2026
Related Faults
Source: Wago PFC200 PLC