Problem using PID toolkit and control design toolkit to design the closed loop system. (for DC motor closed loop)

[cyrus_sun]

Hi, i have facing some problem during i upgrade a project. This project is an opened loop system, it only achieved up to controlling the speed of motor, detecting the speed of motor, and switching the direction of motor while controlling the motor (This motor is a 12 VDC motor).

In order to improve the project, closed-loop dc motor control system will be implemented to correct the error of the motor's speed and maintaining the speed for the initial setting. I would like to use PID control method to do the closed loop system. I already installed the PID toolkit V8.2 and control design toolkit V2.1.2, and i'm using DAQ usb 6221, LabVIEW 8.5

Below is my problem.

http://img177.imageshack.us/my.php?image=howtocreatethesetpointnx2.jpg

question: 1. How to generate a icon for set point? my setpoint is duty cycle...

                2. How to feedback the output duty cycle to summing junction?

below this is my basic concept

http://img237.imageshack.us/my.php?image=closedloopbz5.jpg

Problem 2:

http://img357.imageshack.us/my.php?image=problem1yk2.jpg

question: Why PID toolkit icon cannot wire to cd series.vi?

Below is my original program...

http://rapidshare.com/files/140538836/pwm_generate-final_PSMII.vi.html

[Eric_R]

Hi Cyrus

Have you had the opportunity to see our developer zone site on the PID toolkit? This article also has sample code at the bottom that may help you in developing your application. I have also linked below knowledge bases regarding setting a point profile and generating a PWM from a digital output line. 

PID toolkit

http://zone.ni.com/devzone/cda/tut/p/id/6440 

How to generate a set point profile:

http://digital.ni.com/public.nsf/allkb/125F27AC143B6AFD86256C2B0004A4DC?OpenDocument

 How to generate a PWM on a digital output line:

http://digital.ni.com/public.nsf/allkb/1561D31534F07D608625727900391114?OpenDocument 

Thank You

Eric Reid

[CMal]

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