Code 10752: [Channel %1: ] Block %2 overflow of local block buffer with tool radius compensation
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 overflow of local block buffer with tool radius compensation 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 Definitions: The cutter radius compensation must buffer a variable number of intermediate blocks in order to enable calculation of the equidistant tool path fo r each NC block. The size of the buffer cannot be determined by simple means. It depends on the number of blocks without traversing information in the compensation plane, the number of contour element s to be inserted and the shape of the curvature in spline and polynomial interpolation. The size of the buffer is fixed by the system and cannot be changed via the MDs. Reaction: Correction block is reorganized. Local alarm reaction. Interface signals are set. Alarm display. NC Stop on alarm at block end. Remedy: Please inform the authorized personnel/service department. Reduce the size of the buffer that has been assigned by modifying the NC program. - By avoiding: - Blocks without traversing info rmation in the compensation plane - Blocks with contour elements having a variable curv ature (e.g. ellipses) and with curvature radii that are smaller than the compensation radius. (Suc h blocks are divided up into several subblocks). - Reduce the number of reviewed blo cks for collision monitoring (MD20240 $MC_CUTCOM_MAXNUM_CHECK_BLOCKS). 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 10752 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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