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ErrorLib — Industrial Fault Code Library

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I/O-LED 1-1

Overflow of the internal buffer memory for the inline code (Fault code 1, argument 1)

Wago · Modular I/O System PROFIBUS DP

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

The internal buffer memory, which stores the inline code within the Fieldbus Coupler, has overflowed. This condition usually points to a significant hardware fault or a firmware issue affecting the coupler's internal processing capabilities.

Common Causes

  • Internal buffer memory corruption or exhaustion within the coupler
  • Hardware defect within the coupler's memory or processor

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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