Code 231-E019: CC%2 SPLC configuration error ERR-ID=%4
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 SPLC configuration error ERR-ID=%4 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] Alarm ID 1: - Internal software error Alarm ID 2: - Invalid value of machine parameter CfgSafety.inverseInputNoA, CfgSafety.inverseInputNoB, or CfgSafety.testInputNo Alarm ID 3: - The version of the NC software was changed after the safety inspection and acceptance of the machine. - The version of the NC software and the version of the SplcApiMarker.def file being used that is stored in the safety-related machine parameter CfgSafety.splcApiVersion do not match. Alarm ID 4: - Permitted number of SPLC markers (1000/2000) was exceeded. Alarm ID 5: - Permitted number of SPLC DWORDs (1000/3000) was exceeded. Alarm ID 6: - Permitted number of PlcToSPLC transfer markers (64) was exceeded. Alarm ID 7: - Permitted number of PlcToSPLC transfer DWORDs (32) was exceeded. Alarm ID 8: - Marker transfer area PlcToSPLC is faulty. Alarm ID 9: - DWORDs transfer area PlcToSPLC is faulty. [Error correction] Alarm ID 1: - Inform your service agency Alarm ID 2: - Check the values of the machine parameters CfgSafety.inverseInputNoA, CfgSafety.inverseInputNoB, and CfgSafety.testInputNo. Alarm ID 3: - Transfer the 'SplcApiMarker.def' file appropriate to the installed NC software version into the SPLC project. - Enter the value of the constant SPLC_API_VERSION from this file into the safety-related machine parameter CfgSafety.splcApiVersion. - Repeat the safety inspection and acceptance of the machine with the appropriate comprehensiveness. Alarm ID 4: - Check the SPLC program and CfgPlcSafety.splcMarkers Alarm ID 5: - Check the SPLC program and CfgPlcSafety.splcDWords Alarm ID 6 and 8: [526] 10/2023 - Check the SPLC program and CfgPlcSafety.splcMarkersFromPlc[] Alarm ID 7 and 9: - Check the SPLC program and CfgPlcSafety.splcDWordsFromPlc[] 10/2023 [527]
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 231-E019 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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