4500

Controller ID not allowed

Beckhoff · TwinCAT 2 NC

What does 4500 mean?

The value configured for the controller ID is invalid, typically because it's already assigned, out of range (not 1-255), or zero/negative. A unique ID is crucial for the NC system to correctly identify and manage individual controllers. An invalid ID prevents the controller from being recognized and functioning within the system.

Common Causes

  • Attempt to assign a controller ID that is already in use by another controller or device on the same network (e.g., P3-01).
  • Configuration of a controller ID as zero or a negative value, which falls outside the permissible range of 1-255.
  • Assignment of a controller ID greater than the maximum allowed value of 255 (e.g., P3-01 set to 256 or higher).
  • The configured controller ID is not present in the NC system's bus configuration or device mapping file.
  • Manual entry error when setting the controller ID via the HMI or configuration software.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Review the entire network topology and configuration (e.g., EtherCAT master configuration) to identify duplicate controller IDs on the bus.

  2. 2

    2. Access the controller ID parameter (e.g., P3-01, Device ID) in the affected controller and ensure it is a unique value between 1 and 255.

  3. 3

    3. Compare the configured controller ID with the NC system's device assignment table to ensure consistency and validity.

  4. 4

    4. If configuring a new controller, ensure its ID is unique and properly added to the system's hardware configuration file.

  5. 5

    5. Power cycle the controller and the entire communication network after applying ID changes to ensure the new configuration is active.

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Verified technical data. Last updated: March 2026

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