Simulating PID loops

tomhelliwell · Apr 30, 2009

Hello there, I have to do a presentation at college to show the successful simulation of a PID loop. such as a graph.

Is it possible to simulate a PID loop without a connection to a PLC? Im using Intouch 10.0

thanks
Tom

MartiniRossy · Apr 30, 2009

You couldn't sim it in WW with no connection to a PLC because that's where the loop data will be. I have a VB program for simulating a PID loop if you want it.

tomhelliwell · Apr 30, 2009

ahh right. Yes please that would be great

MartiniRossy · Apr 30, 2009

Here you go. Self explanatory.

Peter Nachtwey · Apr 30, 2009

Can you write code in Wondereware?

If so then simulating a plant being controlled by a PID should be easy.

You aren't simulating the PID as much as simulating the 'plant' or system you are trying to control. What kind of plant are you going to simulate for PID control?

tomhelliwell · Apr 30, 2009

There is no system as such this is theory. I can manually choose a setpoint/s and with the tuning parameters i have worked out, prove that the parameters are correct.

MartiniRossy · Apr 30, 2009

You can write scrips in WW and use system tags, but it would just be a data graph.

MartiniRossy · Apr 30, 2009

No prob!

Peter Nachtwey · Apr 30, 2009

You should have said this is for a control theory class.

tomhelliwell said:
There is no system as such this is theory. I can manually choose a setpoint/s and with the tuning parameters i have worked out, prove that the parameters are correct.

Your parameters are correct for what kind of system? There are zero, one, two, three, four .. pole systems. The are non-integrating ( type 0 ) and integrating ( type 1 ) systems. When there are two or more poles it is possible to have complex pairs ( underdamped ), critically damped and over damped poles.

Each type of system has a different formula for calculating the PID gains.
Knowing what your plant is like is the first step.

I would try scilab which is free at www.scilab.org.

Simulating PID loops

tomhelliwell

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MartiniRossy

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tomhelliwell

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Peter Nachtwey

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