Code 231-E01B: CC%2 SPLC program error ERR-ID=%4 ObjId=%5
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 SPLC program error ERR-ID=%4 ObjId=%5 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
Param=%6 [Cause of error] - The SPLC program has found an illegal value in an API marker or in an API word in the ApiToSafety (symbolic memory interface of SPLC to the safety software SKERN). The additional information provides exact information: ERR-ID = Information ObjId = Depends on the ERR-ID Param = Depends on the ERR-ID ERR_ID: 100: PP_AxGrpStateReq - Range violation SPLC-CC ObjektID = Axis group Parameter = Value of the required safety function 200: PP_AxGrpActivate - Illegal marker value ObjektID = Axis group Parameter = 1 - SPLC CC marker value illegal = 2 - SPLC MC marker value illegal 300: PP_AxFeedEnable - Illegal marker value ObjektID = Axis Parameter = 1 - SPLC CC marker value illegal = 2 - SPLC MC marker value illegal 400: PP_AxGrpStopReq - Range violation SPLC CC ObjektID = Axis group Parameter = Value of the required safety function 500: PP_AxGrpPB - Illegal marker value ObjektID = Axis group Parameter = 1 - SPLC CC marker value illegal = 2 - SPLC MC marker value illegal 600: PP_GenFB_NCC - Illegal marker value SPLC CC ObjektID = No meaning Parameter = No meaning 700: PP_GenCVO - Illegal marker value ObjektID = No meaning Parameter = 1 - SPLC CC marker value illegal = 2 - SPLC MC marker value illegal 800: PP_AxGrpPermitDrvOn - Illegal marker value ObjektID = Axis group Parameter = 1 - SPLC CC marker value illegal = 2 - SPLC MC marker value illegal 900: PP_GenMKG - Illegal marker value SPLC CC ObjektID = No meaning Parameter = No meaning 1000: PP_GenTBRK - Illegal marker value SPLC CC ObjektID = No meaning Parameter = No meaning [Error correction] - To set API words, use only the definitions of the corresponding datum in "SPlcApiMarker.def" - Check the range limits of the API word. - Check the values assigned to the API marker. - Inform your service agency. [538] 10/2023
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-E01B 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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