Code 22050: [Channel %1: ] Block %3 spindle %2 no transition from speed control mode to position control mode
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %3 spindle %2 no transition from speed control mode to position control mode 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, label Definitions: - An oriented spindle stop (SPOS/SPOSA) has been progr ammed or the position control of the spindle was switched on with SPCON but no spindle encoder has been defined. - When switching on the position control, the spin dle speed is greater than the limiting speed of the measuring system. Reaction: NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Spindle without attached encoder: Any NC language elements requiring the encoder signals must not be used. Spindle with attached encoder: Enter the num ber of spindle encoders used in the MD30200 $MA_NUM_ENCS. Program Continuation: Clear alarm with the RESET key. 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 22050 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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