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F100:01 (7)

Severe Fault (Safety Project State)

Beckhoff · EL6900 Operating Instructions

What does F100:01 (7) mean?

This code, corresponding to State '7' of CoE object F100:01 (Safety Project State), signifies that the EL6900 has switched off due to a severe internal fault. In this state, a safety project cannot be loaded or started. This indicates a critical error in the safety logic execution or hardware that has led to a fail-safe shutdown.

Common Causes

  • The safety system is in an invalid or uninitialized state, preventing operation.
  • The safety project loaded into the device is not active or has a critical configuration error.
  • Safety interlocks have not been correctly acknowledged or are in an unsafe state.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review the TwinCAT System Manager logs for any additional diagnostic messages specifically related to the EL6900.

  2. 2

    Check for any recent changes in the EtherCAT configuration or safety project that might trigger a severe internal fault.

  3. 3

    Verify the integrity of the safety project currently loaded or attempted to be loaded on the EL6900.

Browse all codes in this manual (16)
Verified technical data. Last updated: April 2026

Related Faults

0005 hexMaximum Temperature Exceeded0006 hexTemperature Fell Below Minimum0007 hexTemperature Difference Exceeded
Source: Beckhoff EL6900 Operating Instructions
Open Manual (Page 55)Search more codes in this manual