Code 605-0344: Protective zone monitoring not allowed in axis system with B
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Protective zone monitoring not allowed in axis system with B 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
axis [Cause of error] The protection zone monitor in the axis system does monitor any position changes of the tool by rotary axes (e.g. the B axis). [Error correction] - Activation of the expanded protection zone monitor is required (MP_enhancedProtZone = 2: Machine base system) - In addition, for machines with rear-face machining, adjustments in the kinematics is required - Contact the machine tool builder - Inform your service agency
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 605-0344 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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