Code 20064: [Channel %1: ] Axis %2 selection of several axes with an active taper angle is not permitted.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Axis %2 selection of several axes with an active taper angle is not permitted. 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 Definitions: With an active taper angle, only one geometry axis at the time can be travers ed in JOG mode by pressing traversing keys. Simultaneous traversing of a geometry axis as a machi ne axis is not permitted either. Reaction: Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Starting the geometry axis only if traversing of the other geometry axis or machine axis completed. Program Continuation: Clear alarm with the RESET key in all channels. Restart part 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 20064 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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