F100:0A

Output Size Mismatch

Beckhoff · EL6900 Operating Instructions

What does F100:0A mean?

This CoE object indicates that the length of the output data does not match the output data length calculated from the safety logic. This signals a configuration error between the EtherCAT master and the safety project concerning the expected output data size from the EL6900, which can lead to improper control or safety functions.

Common Causes

  • The size of the output data configured in the application does not match the expected size from the hardware or communication interface.
  • Mismatched output mapping between the PLC and the physical I/O modules.
  • Incorrect parameter P1-34 (Output configuration) in the safety device.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the configured output data length for the EL6900 in the EtherCAT master configuration (e.g., TwinCAT System Manager).

  2. 2

    Compare the configured output data length with the length calculated and expected by the compiled safety logic project.

  3. 3

    Ensure that the TwinSAFE safety project has been correctly compiled and downloaded to the EL6900, matching the current hardware configuration.

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Verified technical data. Last updated: March 2026

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Source: Beckhoff EL6900 Operating Instructions