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Heidenhain Controller
Communication · Intermediate · 30-120 minutes
HEIDENHAIN 230-01C7 - Communication between MC and CC is faulty
This alarm specifically indicates the internal processor-to-processor communication link between the Main Computer and Communication Computer has failed. Unlike axis communication errors, this is an internal control architecture failure where the two primary processing units cannot exchange data over the backplane bus, requiring hardware inspection or firmware recovery.
230-01C7
HEIDENHAIN 230-01C7 - Communication between MC and CC is faulty
Communication between MC and CC is faulty
Communication breakdown between the MC computer unit and CC controller unit via the HSCI interface. This internal bus error prevents proper coordination between control components.
Root Cause Summary
This alarm specifically indicates the internal processor-to-processor communication link between the Main Computer and Communication Computer has failed. Unlike axis communication errors, this is an internal control architecture failure where the two primary processing units cannot exchange data over the backplane bus, requiring hardware inspection or firmware recovery.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Power Down and Lock Out
Completely power down the machine, disconnect main power, and apply lockout/tagout procedures. Wait at least 60 seconds for capacitors to discharge.
High voltage present inside control cabinet. Only qualified personnel should open control enclosures.
- 2
Access Internal Control Boards
Open the TNC control enclosure and locate the Main Computer (MC) board and Communication Computer (CC) board. On TNC 620/640 controls, these are typically stacked modules in the main processor housing.
Document the original configuration with photos before removing any boards or cables.
- 3
Inspect and Reseat Boards
Check all ribbon cables and board-to-backplane connectors for damage, corrosion, or bent pins. Carefully remove and reseat both MC and CC boards, ensuring they are fully seated in their connectors with locking mechanisms engaged.
Apply gentle but firm pressure when reseating boards. You should feel a definite 'click' when properly seated.
- 4
Verify and Power Up
Double-check all connections, close the enclosure, restore power, and observe the boot sequence. The alarm should clear if connection was the issue.
Call a technician if:
- ·Hardware unit replacement required
- ·Advanced diagnostics needed
- ·Multiple related alarms present
- ·Safety systems affected
Prevention
- Regular HSCI cable inspection
- Maintain proper EMI shielding
- Monitor power supply stability
- Keep connections clean and tight
Common Mistakes
- Disconnecting HSCI cables with power on
- Ignoring EMI sources during troubleshooting
- Not checking power supply voltages first
- Attempting unit swaps without proper ESD protection
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.