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Periodically we publish a question and answer. These are questions that have come by various methods: e-mail to john@jashaw.com,   various forums such as control.com or the sci.engr.control news group, or personal contact. The answers are those John Shaw has provided to the questions. Often the questions and answers are rewritten to make them more generally applicable. Several questions may be combined into one general question, therefore names will not usually be used.


Is proportional only control better than PI control for some applications?
Velocity and Full Value forms of the PID algorithm
What is the advantage of derivative on process rather than on error?
Fail Safe Level Switch Connections
Is derivative control just used on temperature loops?
What is the "standard" PID equation? Gain affects all terms?
What is reset windup, what harm does it cause, and how can it  be prevented?
What is the difference between parallel and series derivative?