Siemens alarm F30651: SI MM: Synchronization with Control Unit unsuccessful
SINAMICS S120 drive fault · SINAMICS S120
What it means
Safety Integrated requested synchronization of the safety time slices between Control Unit and Motor Module and this routine failed. The result is a STOP A that cannot be acknowledged by operator action. The manual prescribes POWER ON for all components and, if recurring, firmware upgrades of Motor Module and Control Unit - otherwise hardware replacement.
Likely causes
- transient boot-up synchronization failure between CU and MM
- mismatched CU/MM firmware versions
- defective DRIVE-CLiQ connection used for safety communication
- failing safety-related electronics in CU or MM
Need the part urgently?
Send us alarm F30651 with your machine details — typical RFQ turnaround is 24–48h.