Beckhoff KL5111 encoder program and feature register

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Hello

I am having trouble setting up my encoder program to read and give an RPM value from a pulse train from an encoder.

I have today found the "feature register" of the KL5111 and am trying to set it up as a counter. I am not able to do this.

can anyone direct me on what values to write and to what register to do this. Also if anyone is willing could they have a look at my program or even better if they have a sample program to convert an encoder signal to 750 RPM.

thanks for the help