I/O-LED 1-5

Fault during reading from the FLASH memory (Fault code 1, argument 5)

Wago · Modular I/O System PROFIBUS DP

What does I/O-LED 1-5 mean?

An error occurred while the Fieldbus Coupler was attempting to read data from its internal flash memory. This indicates a defect in the flash memory component or a corruption of the stored data, preventing the coupler from accessing essential operational instructions.

Common Causes

  • Defective flash memory component within the coupler
  • Corrupted data stored in the flash memory

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Coupler.

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Verified technical data. Last updated: March 2026

Related Faults

BUS-LED 2-nFaulty configuration byte n (Fault code 2, argument n)BUS-LED 1-1Insufficient configuration data (Fault code 1, argument 1)I/O-LED 4-0Data fault on internal bus or Internal bus interruption on Coupler (Fault code 4, argument 0)
Source: Wago Modular I/O System PROFIBUS DP
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