What causes Heidenhain alarm 140-0031?

User entered password to access OEM-protected machine parameters (MP) in MOD function. Password entered to unlock protected NC programs or program sections. Access to system configuration or PLC settings requiring password authentication. Entry of manufacturer service password for diagnostic or setup functions. Password authentication for key switch level changes or permission level escalation.

How do I fix Heidenhain alarm 140-0031?

1. Verify in the error log (MOD → Show Error Messages) to see which password was logged and timestamp 2. Check if the password entry was intentional and authorized for maintenance or setup work 3. Review current key switch position and permission levels to understand access context 4. If unauthorized access is suspected, change OEM passwords via machine parameter configuration 5. Document the event if required by your facility's security or quality procedures 6. Clear the message from the error log if it is informational only and no action is needed

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Heidenhain Controller

Servo/Axis · Intermediate · 30-120 minutes

Alarm 140-0031

Heidenhain 140-0031 - entered as password

This message is generated automatically by the TNC control system as an audit trail entry whenever password authentication occurs. It is not an error condition but a security logging feature to track access to protected control functions, OEM areas, or restricted machine parameters. The message itself requires no corrective action unless unauthorized access is suspected.

HeidenhainServo/AxisIntermediate30-120 minutes

140-0031

Heidenhain 140-0031 - entered as password

entered as password

Root Cause Summary

This message is generated automatically by the TNC control system as an audit trail entry whenever password authentication occurs. It is not an error condition but a security logging feature to track access to protected control functions, OEM areas, or restricted machine parameters. The message itself requires no corrective action unless unauthorized access is suspected.

Safety

Refer to Heidenhain service manual
Ensure qualified technician performs repairs

Causes and Fixes

1
Access Error Log
Press MOD key, then select 'Show Error Messages' or 'Error Log' to view the complete entry with timestamp and context
The error log shows the exact time and sequence of events, helping determine if password entry correlates with specific maintenance activities
2
Verify Parameter Access
Press MOD, navigate to 'Machine Parameters' and check which MP sections were accessed (General, Axes, Encoder, PLC, OEM-specific areas)
OEM-protected parameters typically require higher-level passwords than standard machine parameters
3
Document Service Activity
Record the parameter changes made during this session if password was entered for authorized service work
Unauthorized parameter changes can affect machine safety systems and accuracy
4
Clear Informational Message
If entry was authorized, clear the message from the error log by selecting it and pressing the delete/clear function key
This message does not require acknowledgment or control restart - it is informational only

DIY Feasiblehigh confidence

Call a technician if:

·Multiple password lockouts occur
·Unable to obtain correct passwords from documentation
·System requires service-level authentication

Prevention

Maintain updated password documentation
Verify user authorization levels regularly
Keep service contact information accessible

Common Mistakes

Using old passwords after software updates
Confusing OEM passwords with service passwords
Attempting access without proper user rights

Related Alarms

140-0032 140-0030 120-0001

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Always verify with your machine manual or a certified technician before performing service procedures.