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Heidenhain Controller
Communication · Intermediate · 30-120 minutes
HEIDENHAIN 236-A006 - ProfiNet: Error during assignment of drives
This alarm indicates a fundamental mismatch between the TNC control's configured axis-to-drive mapping and the actual ProfiNet devices detected on the network during initialization. The control expects specific drives at designated ProfiNet station addresses but cannot establish proper assignment due to configuration errors, addressing conflicts, or communication failures during the network startup phase.
236-A006
HEIDENHAIN 236-A006 - ProfiNet: Error during assignment of drives
ProfiNet: Error during assignment of drives
The TNC cannot assign an axis to a ProfiNet-connected drive. Either the configuration data is wrong or there is a fault in a drive.
Root Cause Summary
This alarm indicates a fundamental mismatch between the TNC control's configured axis-to-drive mapping and the actual ProfiNet devices detected on the network during initialization. The control expects specific drives at designated ProfiNet station addresses but cannot establish proper assignment due to configuration errors, addressing conflicts, or communication failures during the network startup phase.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Access ProfiNet drive configuration
Press MOD key → select 'ProfiNet' → 'Drive Configuration'. Document the current axis assignment showing which TNC axis (X, Y, Z, etc.) is mapped to which ProfiNet station address.
Take a screenshot or write down the complete configuration before making changes - you may need to reference the original setup.
- 2
Verify physical drive station addresses
Access each drive's front panel or configuration interface and confirm the ProfiNet station address matches what is configured in the TNC. Check rotary switches or drive parameter P918 (typical for Heidenhain drives) for the assigned address.
Do not change drive addresses while the system is powered and ProfiNet is active - always power down completely first.
- 3
Correct axis-to-address mapping
In MOD → ProfiNet → Drive Configuration, assign each TNC axis to the correct ProfiNet station address matching the physical drives. Ensure no duplicate assignments exist.
The station address must match exactly - even being off by one digit will trigger this alarm.
- 4
Save configuration and restart
Save the modified configuration, perform a complete power cycle of the control and drives (not just a control restart), and monitor the startup sequence for successful drive assignment.
Call a technician if:
- ·ProfiNet interface module replacement needed
- ·Multiple drive hardware failures
- ·Complex network topology issues
Prevention
- Regularly backup ProfiNet configurations
- Perform periodic cable inspection
- Monitor drive status LEDs during operation
- Keep spare ProfiNet cables and terminators
Common Mistakes
- Mixing standard Ethernet cables with ProfiNet
- Forgetting network termination resistors
- Not matching physical drive addresses to configuration
- Attempting configuration changes while system is running
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Always verify with your machine manual or a certified technician before performing service procedures.