PID Loop Review

[wbaumgartner]

Hi all, I am trying to set up a PID loop for a project I'm working on, and I was hoping someone could take a look at it for me. Most of what is written comes from the Q, L programming manual, but I've changed a few things so that the program can write changes to the SV as needed. The processor is a Q03UDE and the Analog Module is a Q64AD2DA, using only channels 1 and 5. Thanks for looking!

PID Project.gxw

[Thiago Turcato]

Are you getting some alarm or problem?

[wbaumgartner]

No, I have not implemented it yet. I work remotely, and there are no automation techs onsite. The maintenance lead is onsite to help me test, but I want to make sure I have it correct before installing.

[Thiago Turcato]

     Dear wbaumgartner,

     I took a quick look and your program looks OK for me, as program structure. I ran it under simulator to check if any errors would appear (and, believe me, if you do something inconsistent for these QPLC PID instructions, you will sure get 4100 coded operation error) and no errors (I don't know if you tried to run your program under it, and more recently the GXW2 simulator is supporting PIDINIT/PIDCONT instructions).

     As you may know, PID is very process-dependent control so it is difficult to really know if it will work but all-in-all it the program looks fine.

     BR,

     Thiago

[wbaumgartner]

Thank you very much.