Code 27023: Axis %1 stop B triggered
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 stop B triggered 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 = Axis number Definitions: This alarm is output together with alarm 27010 "Tol erance for safe operational stop exceeded" or after alarm 27001 "STOP F triggered". The alarm can be reprogrammed in MD ALARM_REACTION_CHAN_NOREADY (channel not ready). Reaction: Mode group not ready. Channel not ready. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Channel not ready. Trigger a "Deceleration on the current limit" and acti vation of the timer for a switchover after STOP A (see MD $MA_SAFE_PULSE_DISABLE_DELAY). Remedy: Eliminate causes of alarm "Tol erance for safe standstill exceeded " or "STOP F triggered" (see description of these alarms). Program Continuation: Switch control OFF - ON. 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 27023 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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