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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

124

App ID Changed

Allen-Bradley · PowerFlex 750

What does 124 mean?

The application firmware on the main control board has been updated or changed. While not necessarily an error, this fault indicates a firmware revision discrepancy that requires verification. Ensure that the new firmware is compatible with the existing configuration and application to avoid operational issues.

Common Causes

  • Drive application firmware updated, resulting in a new application ID.
  • Firmware corruption leading to a fallback to a different, potentially older, application version.
  • Main control board replacement with a board containing different firmware revision.
  • Incorrect firmware file flashed onto the drive during a maintenance procedure.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Verify the current application firmware version displayed on the drive's HMI (e.g., 'P0-01') against the required version for the machine.

  2. 2

    2. Confirm that the installed firmware matches the application requirements and the project documentation.

  3. 3

    3. If a firmware update was intended, proceed with any necessary parameter migration or verification steps (e.g., using DriveTools SP).

  4. 4

    4. If the firmware change was unintentional, re-flash the correct application firmware using the manufacturer's specified tool.

  5. 5

    5. After firmware confirmation or update, perform a full drive parameter backup to a computer or memory card.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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Source: Allen-Bradley PowerFlex 750
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