Code 231-E018: CC%2 SPLC alarm ERR-ID=%4 SST0=%5 SST1=%6
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 SPLC alarm ERR-ID=%4 SST0=%5 SST1=%6 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
OUT=%7 [Cause of error] - Error in the SPLC run-time program Meaning of the alarm ID 100, 101, 102, 104 and 200 to 206: Internal software error Meaning of alarm ID 103: The value of the read-back output with the number "OUT" is "1", although "0" was commanded by the SPLC for this output. [Error correction] - Measure for alarm ID 100, 101, 102, 104 and 200 to 206: Please inform your service agency - Measure for alarm ID 103: Check whether the output with the number "OUT" has a short circuit with +24 V. If this is not the case, please inform your service agency. - Inform your service agency. 10/2023 [525]
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-E018 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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