PID control stategy book?

[Regnirps at aol.com]

> Does anyone know of a good book or text on PID control systems

I have never seen really good book on the subject, but two that are in print 
and pretty useful are:

Control Engineering by E. A. Parr (With Disk with some VB examples)
Tuning and Control Loop Performance by G. K. McMillan

Second one is aimed at optimizing your loop.

Charlie Springer
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