John A. Shaw

I am an engineer and have worked in the field of process control for over 25 years. Until mid 1994 I worked at Taylor Instrument Company, now part of ABB Industrial Systems. Currently I am owner of Process Control Solutions, which provides consulting services to users of DCSs and other control systems in the Pharmaceutical, Chemical, Power, Pulp and Paper, Textile, and other industries. I am a senior member of ISA and also a member of AIChE and TAPPI. I live in Rochester, NY and Cary, NC.

Due to my experience with the ABB Mod 300 and Advant systems much of my work is related to those systems. See Details

Control Information

Here are some links to some information about process control that may be useful:

Tutorial on the PID control loop and tuning (in 6 parts)
This tutorial describes the PID control algorithm, how it works, and how it is tuned.

Brief Explanation of the PID control algorithm
A brief version of the tutorial.

Suggested Code for the PID Algorithm
A suggestion about how to implement the PID algorithm in digital form.

Cascade Control
A short explanation, with diagrams, of cascade control and the details of its implementation.

Ratio Control
A short explanation, with diagrams, of ratio control and the details of its implementation.

ControlSim The PID controller and process simulator based on MS Excel spread sheets. $45.00	*Click here to get more details, buy, and download*

Buy and download my eBook: The PID Control Algorithm: How It Works, How To Tune It, and How to Use It. 2nd ed. 62pp Adobe .pdf file only $15	Most major credit cards accepted. *Get more details, buy, and download*

ControlSim The PID controller and process simulator based on MS Excel spread sheets. $45.00	*Click here to get more details, buy, and download*

Buy and download my eBook: The PID Control Algorithm: How It Works, How To Tune It, and How to Use It. 2nd ed. 62pp Adobe .pdf file only $15	Most major credit cards accepted. *Get more details, buy, and download*