24579

HMI or Logix Designer Owns Equipment Phase

Allen-Bradley · Logix 5000 Advanced Process Control and Drives

What does 24579 mean?

The PATT instruction attempted to take ownership, but the equipment phase is currently owned by Logix Designer or an HMI, which holds higher priority. The program can attach but cannot command. This scenario is specific to CompactLogix 5370 and ControlLogix 5570 controllers.

Common Causes

  • Another higher-priority interface (Logix Designer, HMI) has an active ownership claim on the equipment phase.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Determine if the equipment phase is currently being manually controlled via Logix Designer or an HMI.

  2. 2

    If manual control is not intended, ensure the HMI or Logix Designer relinquishes ownership of the equipment phase to allow program control.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley Logix 5000 Advanced Process Control and Drives