A1920 alarm in siemens sinamics V90 drive indicates Drive Bus receive setpoints after To. This means the network output data (setpoints) arrived too late within the synchronized communication clock cycle.
Cause: Output data of Drive Bus master (setpoints) received at the incorrect instant in time within the Drive Bus clock cycle.
Remedy:
- Check bus configuration.
- Check parameters for clock cycle synchronization (ensure To > Tdx).
Note:
To: Time of setpoint acceptance
Tdx: Data exchange time
