PC control with c# . servo motor control

I have the following project that must be written using PC control.
cards are used. ( Servo Control Card MR-MC341 (64axis) or MR-MC210/240 (20axis) Mitsubishi
Cclink Control Card Q80BD-J61BT11N/Q80BD-J61BT11 Mitsubishi
EtherCAT Card Beckoff FC1100 Beckhoff
) Write a program in C# to control the position of the servo motor. Please help me, I don't understand PC control very well.
 
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