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42F4

Invalid auxiliary axis entry

Beckhoff · TwinCAT 2 NC

Was bedeutet 42F4 ?

An auxiliary axis entry, where motion or configuration is expected, is found to be empty. This error suggests an incomplete or missing configuration for an auxiliary axis that is part of a kinematic group or coordinated motion, preventing the system from properly including it in calculations.

Häufige Ursachen

  • A kinematic transformation expects a defined auxiliary axis at a specific index, but no axis is configured or assigned to that entry.
  • An auxiliary axis was deleted from the system without updating the kinematic group's definition that referenced it.
  • Partial configuration load or a corrupted project file where an auxiliary axis reference points to an empty or invalid slot.
  • Manual configuration error, leaving an auxiliary axis entry blank or unassigned in the NC group setup despite being required.
  • Mismatched software versions causing a discrepancy in how auxiliary axis entries are handled or validated by the NC runtime.

Reparaturschritte & Checkliste

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

  1. 1

    1. Access the kinematic group configuration in the engineering software (e.g., TwinCAT System Manager).

  2. 2

    2. Identify the specific auxiliary axis entry that is reported as invalid or empty within the group definition.

  3. 3

    3. Either assign a valid auxiliary axis to that entry or remove the empty entry if it is not truly required for the kinematic transformation.

  4. 4

    4. Verify that the total number of auxiliary axes configured in the group matches the requirements of the kinematic definition.

  5. 5

    5. Recompile and download the entire NC configuration to the controller, then restart the NC task for the changes to take effect.

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Verifizierte technische Daten. Zuletzt aktualisiert: March 2026

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