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Code 201375: <location>Topology: Actual topol ogy, duplicate connection between two components

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>Topology: Actual topol ogy, duplicate connection between two components 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: Preliminary component number: %1, com ponent class: %2, connection number: %3 Drive object: All objects Reaction: NONE Acknowledge: IMMEDIATELY Cause: When detecting the actual topology, a ring-type connection was detected. Fault value (r0949, interpret hexadecimal): ccbbaaaa hex: cc = connection number bb = component class aaaa = preliminary component number of a component included in the ring SINAMICS-Alarms Component class: 1: Control Unit 2: Motor Module 3: Line Module 4: Sensor Module (SM) 5: Voltage Sensing Module (VSM) 6: Terminal Module (TM) 7: DRIVE-CLiQ Hub Module 8: Controller Extension 32 (CX32, NX10, NX15) 49: DRIVE-CLiQ components (non-listed components) 50: Option slot (e.g. Terminal Board 30) 60: Encoder (e.g. EnDat) 70: Motor with DRIVE-CLiQ Component type: Precise designation within a component class (e.g. "SMC20"). Connection number: Consecutive numbers, starting from zero, of the appr opriate connection or slot (e.g. DRIVE-CLiQ connection X100 on the Control Unit has the connection number 0). Remedy: Output the fault value and remo ve the specified connection. 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 201375 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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