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Code 201670: <location>SI Motion: Invalid parameterization Sensor Module

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>SI Motion: Invalid parameterization Sensor Module 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) Cause: The parameterization of a Sensor Module used for Safety Integrated is not permissible. Note: This fault results in a STOP A that cannot be acknowledged. Fault value (r0949, interpret decimal): 1: No encoder was parameterized for Safety Integrated. 2: An encoder was parameterized for Safety Integrat ed that does not have an A/B track (sine/cosine). 3: The encoder data set selected for Safety Integrated is still not valid. 4: A communication error with the encoder has occurred. 10: For an encoder used for Safety Integrated, not al l of the Drive Data Sets (DDS) are assigned to the same Encoder Data Set (EDS) (p0187... p0189). SINAMICS-Alarms Remedy: Re fault value = 1, 2: - use and parameterize an encoder that Safety Integr ated supports (encoder with track A/B sine-wave, p0404.4 = 1). Re fault value = 3: - check whether the drive or drive commissioning func tion is active and if required, exit this (p0009 = p00010 = 0), save the parameters (p0971 = 1) and carry out a POWER ON Re fault value = 4: - check whether there is a DRIVE-CLiQ communicati on error between the Control Unit and the Sensor Module involved and if required, carry out a di agnostics routine for the faults identified. Re fault value = 10: - align the EDS assignment of all of the enc oders used for Safety Integrated (p0187... p0189). Note: SI: Safety Integrated

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 201670 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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