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Help with DAQ Assistant I/P to PID

Hi.

 

I am controlling a pressure tank system using LabVIEW and DAQ 6009. The input to the DAQ from system will be a voltage( corresponding to 4mA- 20mA current from pressure sensor ).

 

The output from Labview to the DAQ ultimately to the system will be a voltage 0-5V which will then be converted to 4mA - 20mA current by a V-I converter.  This current will then be given to a Watson Smith Current-Pressure converter.

 

I need help with LabVIEW Modelling.

 

I have attached a VI named "try1.vi".

Here I have introduced PID and Transfer Function blocks, which gives step response. How to give a set point and a process variable here ? I do not see any terminal in PID block for these.

 

The other file is named "overall system.vi".

 

Here I used another PID block which has setpoint/process variable as i/p. But here I cannot include my system transfer functions.

 

Please show me how I can have my DAQ assistant blocks, PID block as well as system transfer function blocks all in one single VI.

 

Thank you.

 

If you do not understand my question, I will be glad to clarify it. I tried my best to put it into words.

 

Thank you.

 

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