In the first stage, I have a problem on writing Lv program in the data acquisition part of my project and also do not know how to control analog signal using PC set-point.
A good place to start with questions like this is by going trough the example programs that ship with LV, or are available on NI's web site. Find something that is close to what you need and then tweak it to make it exactly what you need.
Mike...
Certified Professional Instructor Certified LabVIEW Architect LabVIEW Champion