Code 320-0042: Inconsistent SPLC program
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Inconsistent SPLC program 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 API version in the selectable SPLC program is not compatible with the control software or the definition of the API version in the SPLC program is faulty. [Error correction] Update the file SplcApiMarker.DEF or correct the SPLC program. The file SplcApiMarker.def must be included in the SPLC program before all other definition files.
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 320-0042 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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