Code 207504: <location>Drive: Motor data set is not assigned to a drive data set
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Drive: Motor data set is not assigned to a drive data set 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, TM41, VECTOR Reaction: NONE Acknowledge: NONE Cause: A motor data set is not assigned to a drive object. All of the existing motor data sets in the dr ive data sets must be assigned using the MDS number (p0186[0...n]). There must be at least as m any drive data sets as motor data sets. Alarm value (r2124, interpret decimal): Number of the motor data set that has not been assigned. Remedy: In the drive data sets, assign t he non-assigned motor data set using the MDS number (p0186[0...n]). - check whether all of the motor data sets are assigned to drive data sets. - if required, delete superfluous motor data sets. - if required, set up new drive data sets and assign to the corresponding motor data sets. See also: p0186 (Motor Data Sets (MDS) number)
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 207504 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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