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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

I/O-LED 1-8

Timeout when writing into the serial EEPROM (Fault code 1, argument 8)

Wago · Modular I/O System PROFIBUS DP

What does I/O-LED 1-8 mean?

The Fieldbus Coupler experienced a timeout while attempting to write data into its serial EEPROM. This suggests an issue with the serial EEPROM component itself or a timing problem during the write operation, preventing persistent data storage.

Common Causes

  • Defective serial EEPROM component within the coupler
  • Timing issue or internal bus contention during write operation to EEPROM

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Coupler.

Browse all codes in this manual (21)
Verified technical data. Last updated: April 2026

Related Faults

BUS-LED 1-1Insufficient configuration data (Fault code 1, argument 1)BUS-LED 1-2Excessive configuration data (Fault code 1, argument 2)BUS-LED 2-nFaulty configuration byte n (Fault code 2, argument n)
Source: Wago Modular I/O System PROFIBUS DP
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