Code 221-0031: Machine base not specified
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Machine base not specified 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 kinematics contain a plane (CfgCMOPlane) and rotary axes. The position of the machine base must be entered in this kinematic configuration. [Error correction] Specify the position of the machine base (in CfgKinAnchor). Use only planes between the machine base and the first rotary axis at the tool. Use only planes between the machine base and the first rotary axis at the machine table.
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 221-0031 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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