F1911 fault in Siemens V70 Drive indicates a Drive Bus clock cycle synchronous operation clock cycle failure. This means the global control telegram to synchronize the clock cycles has failed or violated the time grid over several cycles.
Cause: The global control telegram to synchronize the clock cycles has failed – in cyclic operation – for several Drive Bus clock cycles or has violated the time grid specified in the parameterizing telegram over several consecutive Drive Bus clock cycles.
Remedy:
- Check the physical bus configuration (cable, connector, Drive Bus terminator, shielding, etc.).
- Check whether communication was briefly or permanently interrupted.
- Check the bus and controller for utilization level (e.g. bus cycle time was set too short).
