Code 201331: <location>Topology: At least one component not assigned to a drive object
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Topology: At least one component not assigned to a drive object 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: Component number: %1 Drive object: All objects Reaction: NONE Acknowledge: NONE Cause: At least one component is not assigned to a drive object. - when commissioning, a component was not able to be automatically assi gned to a drive object. - the parameters for the data sets are not correctly set. Alarm value (r2124, interpret decimal): Component number of the unassigned component. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009 Remedy: This component is assigned to a drive object. Check the parameters for the data sets. Examples: - power unit (p0121). - motor (p0131, p0186). - encoder interface (p0140, p0141, p0187... p0189). - encoder (p0140, p0142, p0187... p0189). - Terminal Module (p0151). - option board (p0161).
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 201331 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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