Code 201682: <location>SI Motion CU: Monitoring function not supported
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI Motion CU: Monitoring function not supported 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: %1 Drive object: SERVO, VECTOR Reaction: OFF2 Acknowledge: IMMEDIATELY (POWER ON) SINAMICS-Alarms Cause: The monitoring function enabled in p9501, p9601 or p9801 is not supported in this firmware version. Note: This fault results in a STOP A that cannot be acknowledged. Fault value (r0949, interpret decimal): 1: Monitoring function SLP not supported (p9501.1). 2: Monitoring function SCA not supported (p9501.7 and p9501.8... 15 and p9503). 3: Monitoring function SLS override not supported (p9501.5). 10: Monitoring functions only s upported for a SERVO drive object. 20: Drive-based motion monitoring functions are only supported in conjunc tion with PROFIsafe (p9501 and p9601.1... 2 and p9801.1... 2). 21: PROFIsafe only supported in conjunction with mo tion monitoring functions in the drive (p9501 and p9601.1... 2 and p9801.1... 2). Remedy: De-select the monitoring function involved (p9501, p9503, p9601, p9801). Note: SCA: Safe Cam / SN: Safe software cam SI: Safety Integrated SLP: Safely-Limited Position / SE: Safe software limit switches SLS: Safely-Limited Speed / SG: Safely reduced speed See also: p9501 (SI Motion enable safety functions (Control Unit)), p9503 (SI Motion SCA (SN) enable (Control Unit))
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 201682 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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