Code 160-0122: Contradictory M functions
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Contradictory M functions 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 the same block, you tried to output multiple effective M functions that cancel each other. For example, you cannot program M3 and M4 in the same NC block because both go into effect at beginning of the block. On the other hand, M3 and M5 are allowed in the same block because M3 goes into effect at the block beginning and M5 at block end. The machine tool builder specifies which M functions cancel each other. [Error correction] Correct the NC program. 10/2023 [109]
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 160-0122 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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