Code 231-A083: CC%2 S input not equal to 0 in dynamic test
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 S input not equal to 0 in dynamic test 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] - During the dynamic test of the 2nd emergency stop loop (no later than every 1.5 min), a 0 V level is expected at all safety-related door-contact keylock and switch inputs for a short period. This error appears if a 24 V level continues throughout the test window of 100 ms. - The time window for the dynamic test is too small (computing time problems, software errors) [Error correction] - Check the software version - Inform your service agency - Check the wiring - Check the door contacts and key switches - Exchange the hardware 10/2023 [463]
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-A083 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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