Code 236887: <location>Hub DRIVE-CLiQ (CU): Component fault
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Hub DRIVE-CLiQ (CU): Component fault 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, fault cause: %2 Drive object: All objects Reaction: NONE Acknowledge: IMMEDIATELY Cause: Fault detected on the DRIVE-CLiQ component (DRIVECLiQ Hub Module) involved. Faulty hardware cannot be excluded. Fault value (r0949, interpret hexadecimal): yyxx hex: yy = component number, xx = fault cause xx = 20 hex = 32 dec: Error in the telegram header. xx = 23 hex = 35 dec: Receive error: The telegram buffer memory contains an error. xx = 42 hex = 66 dec: Send error: The telegram buffer memory contains an error. xx = 43 hex = 67 dec: Send error: The telegram buffer memory contains an error. xx = 60 hex = 96 dec: Response received too late during runtime measurement. xx = 61 hex = 97 dec: Time taken to exchange characteristic data too long. Remedy: - check the DRIVE-CLiQ wiring (i nterrupted cable, contacts,...). - check the electrical cabinet design and cable routing for EMC compliance - if required, use another DRIVE-CLiQ socket (p9904). - replace the component involved.
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 236887 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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