about ssi clock rate

How should i select ssi clock rate?

There are two rate clock rate 230k and 921k.

Is 921K better than 230k when encoder can receive 921k?

When i select 921k, what should i consider? LOOP time? encoder? or else?

The clock rate is usually unimportant. For long wire lengths, it may be necessary choose a lower clock rate.

See this topic: http://www.deltamotion.com/support/webhelp/rmctools/Registers/Register_Descriptions/Axis_Parameter_Registers/Feedback/Transducer_Specific/Param_SSI_CLock_Rate.htm