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Heidenhain Controller
Safety · Intermediate · 30-120 minutes
HEIDENHAIN 231-B200 - B200 CC No brake test was conducted
HEIDENHAIN alarm 231-B200 occurs when the TNC control system fails to execute a configured motor brake test on axis %2. This typically happens when brake test parameters are enabled in machine parameters but the actual test cannot be performed due to axis deselection, PLC conflicts, or hardware communication issues.
231-B200
HEIDENHAIN 231-B200 - B200 CC No brake test was conducted
B200 CC No brake test was conducted
This TNC 640 error relates to the motor brake system. The control has detected an issue with brake operation or testing.
Root Cause Summary
HEIDENHAIN alarm 231-B200 occurs when the TNC control system fails to execute a configured motor brake test on axis %2. This typically happens when brake test parameters are enabled in machine parameters but the actual test cannot be performed due to axis deselection, PLC conflicts, or hardware communication issues.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check axis selection status
Navigate to MOD > Machine Parameters > CfgAxes and verify axis %2 is properly selected and not marked as deselected.
Use PLC program to verify axis selection status via V-variables
- 2
Review PLC axis deselection
Check PLC program for M-functions or logic that may deselect the axis during brake test sequence.
Ensure machine is in safe state before modifying PLC logic
- 3
Verify brake test parameters
Check MP7500.x (brake test enable) and MP7501.x (brake test time) for axis %2 - disable if axis intentionally deselected.
Set MP7500.x = 0 to disable brake test for deselected axes
Call a technician if:
- ·Drive amplifier hardware failure
- ·Brake mechanical failure
- ·PLC program modification required
Prevention
- Regular brake test parameter validation
- Monitor PLC cycle times
- Periodic brake hardware inspection
- Maintain proper axis selection configuration
Common Mistakes
- Disabling brake test without disabling parameters
- Incorrect brake timing values
- Ignoring PLC cycle time warnings
- Bypassing brake feedback circuits
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Always verify with your machine manual or a certified technician before performing service procedures.