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Code 10912: [Channel %1: ] Block %2 preprocessing and main run might not be synchronized

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 preprocessing and main run might not be synchronized 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 preset positioning axis run cannot be accura tely calculated beforehand. The reason for this is either that the axes involved in the transformation are traversed as positioning axes or that a transformation pole is circumnavigated too frequently by the curve. The velocity check is performed starting from this bl ock in the main run. It is more conservative than with anticipated calculation. The Look Ahead function is deactivated. If it is not possible to take over the velocity check into the main ru n, part program processing is aborted. Reaction: Alarm display. Remedy: No action is usually necessary. The velocity control operates more effectively, however, if the part program is modified. - If a transformation pole is circumnavigated several ti mes by the curve, it helps to split up the block into smaller parts. - If a positioning axis is the caus e, you should check whet her the axis can be traversed as a path axis. The Look Ahead function remains deactivated until preprocessing can be bas ed on defined conditions again (e.g. as a result of change from JOG->AUTO, tool or tool edge change). Program Continuation: Clear alarm with the Delete key or NC START. Diagnostics Manual (DAsl), 03/2009

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 10912 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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