Code 140-0046: Data change without effect
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Data change without effect 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] More than one MP subfile is loaded, or parameters were changed by a PLC module. An attempt was made to edit data, but the changes have no effect during control operation because they are covered over by MP subfiles or PLC changes. [Error correction] Check the active data in the 'effective data' data record. If they do not have the desired values: - Reload the MP subfile in which the changes were made - Unload other MP subfiles - Edit the data in the 'temporary files' data record [48] 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 140-0046 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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