Code 201953: <location>CU DRIVE-CLiQ: Synchronization not completed
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>CU DRIVE-CLiQ: Synchronization not completed 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: %1 Drive object: All objects Reaction: NONE Acknowledge: NONE Cause: After the drive system is powered up, the synchr onization between the basic clock cycle, DRIVE-CLiQ clock cycle and application clock cy cle was started but was not completed within the selected time tolerance. Alarm value (r2124, interpret decimal): Only for internal Siemens troubleshooting. SINAMICS-Alarms Remedy: Carry out a POWER ON (power off/on) for all components. If the error occurs after the drive sampling times we re adjusted, and if a TM31 module is being used, the sampling times (p0115, p4099) should be set as integer multiples to the driv e clock cycles (p0115).
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 201953 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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