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ErrorLib — Industrial Fault Code Library

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F01B

Program owner active

Allen-Bradley · Logix 5000

What does F01B mean?

Someone is currently downloading or editing online, making the program unavailable for other operations. This is a temporary access restriction during programming activities.

Common Causes

  • Program owner active - someone is downloading or editing online

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the active user or workstation currently holding the program owner lock using the 'Who Active' or 'Go Online' features in Studio 5000 Logix Designer.

  2. 2

    Communicate with the identified user or workstation to request they save their work and go offline, releasing the program owner lock.

  3. 3

    Inspect all relevant programming workstations for any unintended or orphaned instances of Studio 5000 Logix Designer that might still be online with the controller.

  4. 4

    Monitor the controller's communication status and access availability in Studio 5000 after potential owner release to confirm the F01B error clears.

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

Related Faults

00D0No block-transfer response (timeout)00D1Checksum mismatch in read response00D2Read/Write request/response mismatch
Source: Logix 5000
Open Manual (Page 165)Search more codes in this manual