Code 112211: Tool preselection cannot be processed.%nNot enough NC memory.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Tool preselection cannot be processed.%nNot enough 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: When tool preselection is process ed, the NC program has to be generated again. Hereby the old NC program is saved first. Then the new program is generated. Here, the NC memory is insufficient to save the new program. The tool preselecti on is not processed. Reaction: Alarm display. Remedy: Free memory space must be created on the NC, and it must be enough for the program to be processed (e.g. by deleting programs that are no longer required). Program Continuation: Internal
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 112211 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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