Code 21702: [Channel %1: ] Block %3 axis %2 measurement aborted
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %3 axis %2 measurement aborted 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 = Axis name, spindle number %3 = Block number Definitions: The measurement block has ended (the programmed end position of the axis has been reached) but the activated touch probe has not yet responded. Measurement level 2 (MEAWA, MEASA, MEAC) Measured values cannot be converted to the workpi ece coordinate system. The measured values of the GEO axes programmed in the measurement task are only available in the machine coordinate system. Causes: Not all GEO axes were programmed in the measur ement task. At least one measured value is therefore missing for conversion back in to the workpiece coordinate system. Further causes: The measurement tasks programmed fo r all GEO axis are not identical. Reaction: Alarm display. Remedy: Verify the traversing movement in the measurements block. - Is it necessary in all cases for the activated pr obe to have switched up to t he specified ax is position? - Are the probe, cable, cable distribut or, terminal connections in good order? Either program all GEO axes expl icitly or program the traversing movement with the POS[axis] command. 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 21702 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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