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Determine PID values

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Hello,

 

I'm building a system in Labview 2009 with system and control. This system analyses a step response of a DC motor and determines the discrete transferfunction (I do this with system identification tool in Labview). Then  convert de TF to a Zero-pole function. When that is done I want to determine de PID values for this model using the "Design PID for descrete functions" vi block, but the problem is that is doesn't work. I added a screenshot off that part of the program.


If it does work I want to simulate de closeloop TF with PID. And plot a stepresponse (also isn't working).

 

What I'm a doing wrong or forgetting ?

 

Greetz,

 

Jeroen

 

 

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Anyone ? I have tried everything
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Hello Jeroen,

 

Could you post your VI here so I can see what you are working with?

What do you mean by "it does not work" when using Design PID for Discrete Functions VI? 

Andy Chang
National Instruments
LabVIEW Control Design and Simulation
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