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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 1-2

Unknown data type (Fault code 1, argument 2)

Wago · Modular I/O System PROFIBUS DP

What does I/O-LED 1-2 mean?

The Fieldbus Coupler has encountered an unknown or unsupported data type during its operation or initialization process. This suggests a fundamental configuration error or a hardware fault preventing proper data interpretation by the coupler's firmware.

Common Causes

  • Incorrect or unsupported data type specified in the coupler's configuration
  • Hardware defect within the coupler causing misinterpretation of data structures

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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