Creating model with Control and Design LV2009

Hello,
I'm trying to make a PI control model with Control and Design in labview 2009. I'm tyring to create the following transferfunction:
D(z)=Kp+((Kp*Ki)/(1-z^-1))
But labview adds by itself an extra z^-1 in the Numerator
See the attachment what I have tried. I first want to create 1+(1/(1-z^-1)). What I'm I doing wrong ?
Greetz,
Jeroen
Attachments:
model.jpg ‏50 KB

Jeroen,
The two expressions "1+(1/(1-z^-1))" and "(2-z^-1)/(1-z^-1)" are equivalent to one another. They just have the terms rearranged. Since LabVIEW expresses a transfer function as a numerator and denominator, it is drawing the function as "(2-z^-1)/(1-z^-1)". You aren't doing anything wrong.
Chris M

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