231-A093

Drive lock through FS, stop 1 switch-off active

Heidenhain · TNC CNC Controllers

What does 231-A093 mean?

This error indicates that a drive is locked due to functional safety (FS) because a Stop 1 switch-off reaction is active for the CC module. An attempt was made to switch on a drive while the CC had not yet completed a running Stop 1 switch-off, or due to an internal software error.

Common Causes

  • Drive locked through functional safety FS.
  • Attempt to switch on a drive while the CC has not yet completed a running Stop 1 switch-off.
  • Internal software error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for the CC to fully complete any active Stop 1 switch-off reaction before attempting to switch on drives.

  2. 2

    Verify the status of the CC module; ensure it is in a ready state before enabling drives.

  3. 3

    Check the software version of the controller and update it if a known issue related to Stop 1 management exists.

  4. 4

    Review the safety program logic to ensure proper handling of drive enable requests during and after a Stop 1 condition.

Browse all codes in this manual (47)
Verified technical data. Last updated: March 2026

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Source: Heidenhain TNC CNC Controllers