Code 235-0096: Error while evaluating a filter condition in the IOCP file
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Error while evaluating a filter condition in the IOCP file 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] DEFINE missing in the MCG file. Faulty filter condition in the IOCP file. The incorrectly evaluated condition is shown in the additional data. The name of the MCG file is shown in the additional data. [Error correction] - Check the MCG file and correct it if necessary - Check the filter condition in the IOCP file and correct it if necessary
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 235-0096 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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