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Unread April 16th, 2019, 10:11 AM   #4
Peter Nachtwey
United States

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Join Date: Apr 2002
Location: Vancouver, WA, US
Posts: 6,951
There are many different forms of PID. Some are better than other depending on what you want to do. Sometimes a full PID is not required. A PI or PD will do but other times a PID with second derivative gain is required. Then there is the problem on how integrator windup is handled.

I haven't played around with the PIDs on a Control Logix but the PIDs on SLCs and Micrologix leave much to be desired.

What someone should write is a Smith Predictor AOI.
"Living is easy with eyes closed, misunderstanding all you see...." Strawberry Fields Forever, John Lennon
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