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Heidenhain Controller
System · Intermediate · 30-120 minutes
HEIDENHAIN 231-E000 - E000 Start test of the cut-out channels not possible
HEIDENHAIN alarm 231-E000 occurs when the PLC attempts to initiate safety cut-out channel testing while the TNC control is not in AUTO mode or axis motors remain energized. This safety interlock prevents diagnostic testing during inappropriate machine states.
231-E000
HEIDENHAIN 231-E000 - E000 Start test of the cut-out channels not possible
E000 Start test of the cut-out channels not possible
The PLC could not start the test of the cut-out channels because the control is not in the AUTO state, or the motors of at least one axis group have not yet been switched off.
Root Cause Summary
HEIDENHAIN alarm 231-E000 occurs when the PLC attempts to initiate safety cut-out channel testing while the TNC control is not in AUTO mode or axis motors remain energized. This safety interlock prevents diagnostic testing during inappropriate machine states.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check current operating mode
Press the operating mode keys and verify the AUTO LED is illuminated on the TNC control panel.
The mode display also appears in the status bar of the TNC screen
- 2
Switch to AUTO mode
Press the AUTO key on the machine control panel to activate automatic mode operation.
Ensure machine is in safe position before switching modes
- 3
Verify mode transition
Confirm AUTO mode is active and check if alarm clears automatically after mode change.
Some machines require a brief delay for mode recognition
- 4
Reset alarm if persistent
Press CE key to clear the alarm after confirming AUTO mode is properly selected.
Call a technician if:
- ·Safety relay hardware failure suspected
- ·PLC program modification required
- ·Persistent alarm after all checks
Prevention
- Always allow proper settling time between mode changes
- Establish consistent machine startup procedures
- Regularly verify safety relay operation during maintenance
Common Mistakes
- Attempting test in wrong operating mode
- Not waiting for motor de-energization
- Ignoring PLC timing requirements
Seeing Multiple Alarms?
Seeing another alarm with this one? Enter the code.
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Always verify with your machine manual or a certified technician before performing service procedures.