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TMS320F28P650SK: DF22 parameters

Part Number: TMS320F28P650SK
Other Parts Discussed in Thread: C2000WARE

Tool/software:

Hi,

I am am looking at the DF22 compensator sample code TI has in DCL library.  The function u1k = DCL_runDF22_C1(&controller1, ek) is used. ek is said to be the servo error. Is this simply the read input voltage from the out put I am wanting to control. Like yk for PID control in TI code? 

Or is ek the error as in rk-yk in PID control analogy.

Thank you for your help.