Code 201416: <location>Topology: Comparison additional component in actual topology
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Topology: Comparison additional component in actual topology 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, Component class: %2, Connection number: %3 Drive object: All objects Reaction: NONE Acknowledge: NONE Cause: The topology comparison has found a component in t he actual topology which is not specified in the target topology. The alarm value includes the co mponent number and connection number of the component with which the additional component is connected. Alarm value (r2124, interpret hexadecimal): ddccbbaa hex: cc = connection number bb = component class of the additional component aa = component number Note: - component class and connection number are described in F01375. - components that are connected to this additional component are not operational. Remedy: Adapting the topologies: - remove the additional component in the actual topology. - download the target topology that matches the actual topology (commissioning software). Note: Under "Topology --> Topology view" the commissi oning software offers improved diagnostics capability (e.g. setpoint/actual value comparison).
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 201416 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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