Code 280-043F: No point angle defined
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical No point angle defined 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] In Cycle 240 Centering you defined parameter Q343 such that centering is done with respect to the diameter. In a drilling cycle you defined parameter Q395 such that the depth is in reference to the tool diameter. You programmed a cycle for chamfering. The point angle for this must be between 1 and 179 degrees. However, no point angle is defined for the active tool. [Error correction] - Set parameter Q343=0 (centering to entered depth). - Set parameter Q395=0 (depth in reference to the tool tip). - Define the point angle in the column T-ANGLE of the tool table TOOL.T.
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 280-043F 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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