Code 236885: <location>Hub DRIVE-CLiQ (CU): Cyclic data transfer error
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Hub DRIVE-CLiQ (CU): Cyclic data transfer error 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: DRIVE-CLiQ communication error from DRIVE-CL iQ Hub Module in question to Control Unit. The nodes do not send and receive in synchronism. Fault value (r0949, interpret hexadecimal): yyxx hex: yy = component number, xx = fault cause xx = 1A hex = 26 dec: Sign-of-life bit in the receive telegram not set and the receive telegram is too early. xx = 21 hex = 33 dec: The cyclic telegram has not been received. xx = 22 hex = 34 dec: Timeout in the telegram receive list. xx = 40 hex = 64 dec: Timeout in the telegram send list. xx = 62 hex = 98 dec: Error at the transition to cyclic operation. Remedy: - Check supply voltage of component involved. - carry out a POWER ON. - 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 236885 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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