231-A041
CC%2 SOM 4 not possible
Heidenhain · TNC CNC Controllers
What does 231-A041 mean?
This error indicates that Safety Operating Mode (SOM) 4 is not possible for the CC%2 controller. The common causes include Keylock Switch 1 not being in automatic mode (BA1), a defective Keylock Switch 1, or a wiring error.
Common Causes
- Keylock switch 1 is not in automatic mode (BA1).
- Keylock switch 1 is defective.
- Wiring error related to Keylock switch 1.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Set Keylock switch 1 to automatic mode (BA1).
- 2
Test the functionality of Keylock switch 1; verify its different positions and their corresponding electrical signals.
- 3
Inspect the wiring connected to Keylock switch 1 for any breaks, shorts, or loose connections.
- 4
Measure continuity across the contacts of Keylock switch 1 in each position to confirm proper operation.
Verified technical data. Last updated: March 2026
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Source: Heidenhain TNC CNC Controllers