A1920 alarm in Siemens V70 Drive

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A1920 alarm in Siemens V70 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.

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