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AM3359: CiA402 in EtherCAT DC mode

Part Number: AM3359

Under the guidance of  PRU-ICSS Industrial Software for Sitara Processors, I can run CIA402 in "free run" mode.When I am trying to set the mode to DC,the TwinCAT shows that:

  

so what is wrong with the project.

Thanks and forgive me for my terrible English!