xxxx 0011

Invalid Connection ID

Beckhoff · TwinSAFE Logic FB

What does xxxx 0011 mean?

The FSoE connection ID used in communication is invalid or does not match the expected ID configured in the devices. This prevents the establishment or continuation of a secure safety connection, rendering the system inoperable due to a breakdown in trusted communication.

Common Causes

  • Invalid Connection Identifier (ID) received.
  • Attempted to communicate with a non-existent or wrong device ID.
  • Network configuration error.
  • Incorrectly assigned communication address.
  • Duplicated Connection IDs on the network.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the FSoE connection ID is correctly configured and identical on both the master and slave devices.

  2. 2

    Check the network topology and ensure no duplicate FSoE connection IDs exist within the safety domain.

  3. 3

    Reinitialize the FSoE connection to ensure IDs are properly synchronized.

  4. 4

    Consult the device manual for specific FSoE connection ID setup procedures.

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Verified technical data. Last updated: March 2026

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Source: Beckhoff TwinSAFE Logic FB