Code 201-0A77: Too many axes programmed
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Too many axes programmed 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] - An NC block has more than the allowed number of simultaneously movable axes. - You tried to use an NC program to make a reverse program in which more than 5 axes are programmed. [Error correction] - Standard version: Program no more than 5 axes per NC block. - Export version: Program no more than 4 axes per NC block. - The source program must not include more than a total of 5 different axes. 10/2023 [245]
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 201-0A77 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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