F01951 fault in siemens 6RA80 DC Drive indicate that the Synchronization application clock cycle missing. This means DRIVE-CLiQ components with different application clock cycle are operated on a DRIVE-CLiQ port, this requires synchronization with the Control Unit. This synchronization routine was unsuccessful.

1. Carry out a POWER ON (power off/on) for all components.
2. Upgrade the software of the DRIVE-CLiQ components.
3. Upgrade the Control Unit software.