About Us

Welcome to ModelingandControl.com. You will find that our posts focus on technical aspects of process control and simulation. The information provided will be based on our experiences in these areas. Between us, we have a broad range of experience in the design and commissioning of batch and continuous process control systems and the development and application of process simulation for operator training and control study. We hope you find the information we post to be of interest and that it will help you in your work.

Why are we doing a joint blog? Well, we have known each other for over 30 years. Over this time we have at various times interacted on projects based on a common interest in process simulate and control. Terry’s work experience is primarily in the Pulp and Paper and Ammonia Industries and in the design and development of control products and associated standards. Mark started his career as a systems engineer working on projects in oil & gas, refining, chemicals, and pulp & paper; from 1995-2005 was lead architect for DeltaV; and in 2006, he joined the wireless team, taking a very active role in the development of the WirelessHART specifications and the development of the IEC 62591 standardization. Thus, our experiences are in many ways complimentary and will allow us to cover a broader range of issues and to present different perspectives on a specific subject.

Meet the Contributors

Terry Blevins

Terry Blevins has been actively involved in the application and design of process control systems throughout his career. For more than 15 years, he worked as a systems engineer and group manager in the design and startup of advanced control solutions for the pulp and paper industry. Terry was instrumental in the establishment of Emerson Process Management’s Advanced Control Program.

From 1998-2005, Terry was the team lead for the development of DeltaV advanced control products. He is the Fieldbus Foundation™ team lead for the development and maintenance of the Function Block Specification and editor of the SIS Architecture and Model Specifications. In this capacity, Terry is involved in the movement of Fieldbus Foundation function block work into international standards. Terry is the U.S. expert to the IEC SC65E WG7 function block committee that is responsible for the IEC 61804 function block standards. He is a voting member and chairman of ISA104-EDDL (Electronic Device Description Language) committee and is the technical advisor to the United States Technical Advisory Group (USTAG) for the IEC65E subcommittee. He is also a member of the USNC TAG (IEC/SC65 and IEC/TC65).

Terry authored “An Overview of the ISA/IEC Fieldbus,” Section 11, Standards Overview, Fifth Edition of the Process/Industrial Instruments and Controls Handbook and coauthored four sections in the Fourth Edition of the Instrumentation Engineer’s Handbook, Process Control and Optimization. He coauthored the ISA bestselling book Advanced Control Unleashed.

He has 36 patents and has written over 65 papers on process control system design and applications.

Terry received a Bachelor of Science in Electrical Engineering from the University of Louisville in 1971 and a Master of Science in Electrical Engineering from Purdue University in 1973. In 2004, he was inducted into Control Magazine’s Process Automation Hall of Fame.

Presently, Terry is a principal technologist in the future architecture team of DeltaV Product Engineering at Emerson Process Management.

 

Mark Nixon

Mark Nixon has been involved in the design and development of control systems throughout his career. Mark started his career as a systems engineer working on projects in oil & gas, refining, chemicals, and pulp & paper. He moved from Canada to Austin, TX in 1998 where he has held a variety of positions in both research and development.

From 1995-2005, Mark was lead architect for DeltaV. In 2006, he joined the wireless team, taking a very active role in the development of the WirelessHART specifications and the development of the IEC 62591 standardization.

Mark’s current research includes control using WirelessHART devices, data analytics for batch process, use of wireless technology the process industry, mobile users, operator interfaces, and advanced graphics. He is currently active in the Center for Operator Performance, WirelessHART, ISA-88 standard, Foundation Fieldbus standards, and ISA-101 standard. He has written numerous papers and currently holds more than 45 patents. He coauthored WirelessHART: Real–Time Mesh Network for Industrial Automation and has made contributions to the Industrial Instruments and Controls Handbook and Essentials of Modern Measurements and Final Elements in the Process Industry. Mark received his Bachelor of Science in Electrical Engineering from the University of Waterloo in 1982.

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