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ErrorLib — Industrial Fault Code Library

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BUS-LED 4-n

Configuration byte (module) n is faulty (Fault code 4, argument n)

Wago · Modular I/O System PROFIBUS DP

What does BUS-LED 4-n mean?

The nth configuration byte, which corresponds to a specific I/O module in the Fieldbus Coupler's setup, is faulty. This indicates an issue with the definition or data integrity for that particular module within the coupler's configuration.

Common Causes

  • Configuration data for the nth I/O module is corrupted or incorrectly defined
  • A hardware issue with the nth module causing faulty configuration reading

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the nth module in the configuration for correctness and consistency.

  2. 2

    Load the corrected configuration onto the coupler.

  3. 3

    Cycle the supply voltage of the coupler (off then on again) to restart.

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
Open Manual (Page 98)Search more codes in this manual