Code 230-00FF: The PLC variable %1 has reached the maximum value of %2
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical The PLC variable %1 has reached the maximum value of %2 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
mm [Cause of error] The variable concerned goes into the calculation of the kinematic compensation and has exceeded the maximum permissible value. The variable will be set to the maximum value. The warning will be deleted as soon as the variable has fallen below the maximum value by 0.1 mm. [Error correction] - Check the calculation for the variable's value - Inform your machine tool builder
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 230-00FF 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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