Code 140-001D: Parameter change during program run or macro run
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Parameter change during program run or macro run 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] You attempted to change configuration data during a program run. These data cannot be changed during a program run (applies to reset, run or ref. errors). The additional information shows the name of the data object that cannot be changed during program run. [Error correction] Select NC stop for the running programs in Program Run Single Block, Test Run and programming graphics, and then an internal stop. Then save the data again. [40] 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 140-001D 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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