Code 230-0442: Progmmd. limit switch/protection zone incorrect for axis %2
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Progmmd. limit switch/protection zone incorrect for axis %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
[Cause of error] The following constraints apply to limit switches and protection zones for modulo axes: - The lower limit must be between –360° and +360°. - The upper limit must be between 0° and +360°. - The lower limit must be less than the upper limit. - The difference between the upper and lower limit must be less than 360°. - If the machine parameter "moveAfterRef" is configured, the axis is not moved further. A warning is output. - Both protection zones = 0 means: Monitoring is inactive [Error correction] Adjust the value for the protection zone. [346] 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 230-0442 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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