Code 201689: <location>SI Motion: Axis re-configured
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI Motion: Axis re-configured 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: Parameter: %1 Drive object: SERVO, VECTOR Reaction: OFF2 Acknowledge: POWER ON Cause: The axis configuration was changed (e.g. c hangeover between linear ax is and rotary axis). Parameter p0108.13 is internally set to the correct value. Note: This fault does not result in a safety stop response. Fault value (r0949, interpret decimal): Parameter number of parameter that initiated the change. See also: p9502 (SI Motion axis type (Control Unit)) Remedy: The following should be carried out after the changeover: - exit the safety commissioning mode (p0010). - save all parameters (p0977 = 1 or "copy RAM to ROM"). - carry out a POWER ON. Once the Control Unit has been switched on, safety message F01680 or F30680 indicates that the checksums in r9398[0] and r9728[0] have changed in th e drive. The following must, therefore, be carried out: - activate safety commissioning mode again. - complete safety commissioning of the drive. - exit the safety commissioning mode (p0010). - save all parameters (p0977 = 1 or "copy RAM to ROM"). - carry out a POWER ON. Note: For the commissioning software, the units are onl y consistently displayed after a project upload.
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 201689 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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