Code 230709: <location>SI Motion MM: STOP D initiated
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI Motion MM: STOP D initiated 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
Message value: Drive object: SERVO, VECTOR Reaction: NONE Acknowledge: IMMEDIATELY (POWER ON) Cause: The drive is stopped via a STOP D (braking along the path). "Safe Operating Stop" (SOS) is activated after the parameterized timer has expired. Possible causes: - stop request from the Control Unit. - subsequent response to the message C30714 "S I Motion: Safely limited speed exceeded". See also: p9353 (SI Motion transition time STOP D to SOS (Motor Module)), p9553 (SI Motion transition time STOP D to SOS (SBH) (Control Unit)) SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009 Remedy: - remove the cause of the fault at the control. - carry out a diagnostics routine for message C30714. This message can only be acknowledged via the Terminal Module 54F (TM54F) or PROFIsafe. Note: SI: Safety Integrated SOS: Safe Operating Stop / SBH: Safe operating stop
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 230709 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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