Code 26263: [Channel %1: ] Block %2: Not enough memory space for determining the distance between two protection zones. Currently available memory space: %3KB.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2: Not enough memory space for determining the distance between two protection zones. Currently available memory space: %3KB. 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
Parameters: %1 = Channel number %2 = Block number, label %3 = Currently available memory Definitions: The determination of the distance between two pr otection zones with the function PROTDFCT requires temporary internal memory space, the size of which depends on the number of elements contained in the protection zones, and t heir positions relative to one another. The size of the available memory space can be changed in MD18896 $MN_MM_MAXNUM_3D_COLLISION. Reaction: Correction block is reorganized. Alarm display. NC Stop on alarm. Remedy: Change NC program or definition of the protection areas involved. Adjust MD18896 $MN_MM_MAXNUM_3D_COLLISION. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program.
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 26263 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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