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Code 201360: <location>Topology: Actual topology is illegal

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical <location>Topology: Actual topology is illegal 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: Fault cause: %1, preliminary component number: %2 Drive object: All objects Reaction: NONE Acknowledge: IMMEDIATELY Cause: The detected actual topol ogy is not permissible. Fault value (r0949, interpret hexadecimal): ccccbbaa hex: cccc = preliminary co mponent number, aa = fault cause aa = 01 hex = 1 dec: Too many components were detected at the Contro l Unit. The maximum permissible number of components is 199. aa = 02 hex = 2 dec: The component type of a component is not known. aa = 03 hex = 3 dec: The combination of ALM and BLM is not permitted. aa = 04 hex = 4 dec: The combination of ALM and SLM is not permitted. aa = 05 hex = 5 dec: The combination of BLM and SLM is not permitted. aa = 06 hex = 6 dec: A CX32 was not directly connected to a permitted Control Unit. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009 aa = 07 hex = 7 dec: An NX10 or NX15 was not directly connected to a permitted Control Unit. aa = 08 hex = 8 dec: A component was connected to a Control Unit that is not permitted for this purpose. aa = 0A hex = 10 dec: Too many components of a certain type detected. aa = 0B hex = 11 dec: Too many components of a certai n type detected at a single line. Note: The drive system is no longer booted. In this stat e, the drive control (closed-loop) cannot be enabled. Remedy: Re fault cause = 1: Change the configuration. Connect less than 199 components to the Control Unit. Re fault cause = 2: Remove the component with unknown component type. Re fault cause = 3, 4, 5: Establish a valid combination. Re fault cause = 6, 7: Connect the expansion module directly to a permitted Control Unit. Re fault cause = 8: Remove component. Re fault cause = 10, 11: Reduce the number of components.

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 201360 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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