F01C

Disk file write protected or inaccessible (offline only)

Allen-Bradley · Logix 5000

What does F01C mean?

The disk file is write-protected or otherwise not accessible, specifically when operating offline. This prevents modifications or updates to the file.

Common Causes

  • Disk file is write protected or otherwise not accessible (offline only)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the current user account has full read/write permissions for the project file and its containing directory.

  2. 2

    Inspect the properties of the project file (.ACD) to ensure the 'Read-only' attribute is unchecked.

  3. 3

    Check the available disk space on the local or network drive hosting the project file.

  4. 4

    Verify network connectivity and proper mapping to the shared location if the project file is stored on a network drive.

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Verified technical data. Last updated: March 2026

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