Paul Bjork wrote:
>
> Awhile back someone recommended a good practical text on digital
> control systems, including PID control theory and application.  I
> can't find it in my archive.  I need to do some fine response tuning
> on a PID loop, and theory and practice aren't quite matching up.
> Sound familiar?
>
> Any suggestions on a sound mathematical text?

"In theory, there's not much difference between theory and practice;
in practice, there is."

Check out
Discrete-Time Control Systems
by Katsuhiko Ogata
ISBN 0-13-216102-8

Don't judge a book by it's cover if you don't know anything about
the subject. You're much better off judging it by its mass to cost
ratio. It was a gamble that paid off well with Ogata's book for me
several years ago. It has nearly a thousand pages to cover control
theory! Plus he provides many examples (there's even a few programs
in BASIC!!!).

Scott