Code 235-008C: Configure the HSCI data rate to 100 Mbit
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Configure the HSCI data rate to 100 Mbit 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] In the configuration datum MP_dataRateHsci in CfgHardware, the HSCI data rate “as fast as possible” was selected. The control found that all connected HSCI are suited for the 1 Gbit/s data rate, but there is at least one cable in the HSCI system that is not suited for this data rate. Because of this hardware configuration, system startup is delayed. [Error correction] To speed up the system startup, do the following: In the configuration datum MP_dataRateHsci in CfgHardware, select the data rate 100 Mbit/s or check the HSCI cable for suitability for the 1 Gbit/s data rate. [602] 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 235-008C 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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