How can I add a PID auto-tune function in Labwindows.

[groggy1]

Specifically, I need the ability to have the code automatically perform a "step-change" tune from 100 degrees F to 200 degs F. Then have the tuning parameters sent to my temperature controller.

My application involves heating molds through various ramps and soaks. I am having problems with variability in my process due to variation in mold mass and heater performance. Therefore I need the ability to do a "Pretune" and have that data sent to my Watlow temp. controller. I am allready communicating to the watlow via rs-232.

[JuanCarlos]

Hi,

It's been some time since I did any control applications, but I belive that the CVI toolset could help you programming and autotunning routine. You can find more information here.

For the set points ramps you can use CVI's function Ramp(...) that generates a pattern that you can later pass as a list of setpoints to your controler.

I hope this helps, please let me know if you have any further questions.

Regards,
Juan Carlos
N.I.