Code 6510: Too many part prog rams in the NC memory
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Too many part prog rams in the NC memory 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
Definitions: The number of files in the file system (part of the NC memory) of the NC has reached the maximum number possible. Note: During initial start-up, this c an concern files from the NC file system, e.g. drive data, MMC files, FIFO files, NC programs,... Reaction: Alarm display. Remedy: Please inform the authorized personnel/service department. - Delete or unload files (e.g. part programs), or - Increase MD18320 $MN_MM_NUM_FILES_IN_FILESYSTEM. Program Continuation: Clear alarm with the Delete key or NC START.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 6510 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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