Code 280-04C7: Tool carrier can't be monitored correctly
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Tool carrier can't be monitored correctly alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] The tool carrier defined in the "KINEMATIC" column cannot be considered correctly in the current constellation, since the tool spindle is configured as a spindle and the turning tool will be reversed in Cycle 800 (Q498=1). This can have an effect on collision monitoring and the path calculations of turning cycles. [Error correction] Check the effects precisely and change the conditions, if necessary. If needed, you can add a new index to your turning tool in the tool management. In this index you define your turning tool rotated by 180°, so that you can use Q498=0 in Cycle 800.
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 280-04C7 on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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