Invited Speaker
Terry Blevins
Emerson Process
Management
PID Advances in industrial control
Abstract
Major advances that improve control in the process industry have been made over the last ten years in the basic PID technology of modern distributed control systems. This paper addresses the impact that international standards have on control implementation and the tools utilized in industry for monitoring and commissioning PID control. Examples are used to illustrate how new technologies, such as model switching for process identification, have allowed manufacturers to introduce a new level of ease-of-use in tools developed for on-demand and adaptive tuning. This paper discusses PID modifications that improve the speed of recovery from process saturation conditions that are common in industrial applications. Also, details are provided on PID modifications that enable effective control with non-periodic measurement updates by wireless transmitters. Finally, prospective future directions for industrial PID controllers are sketched.
Bio
Terry Blevins has been actively involved in the
application and design of process control systems throughout
his career. For over fifteen 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. Terry was the team lead for the development
of DeltaV advanced control products, including auto-tuner
and adaptive PID, Fuzzy Logic, Neural Network and MPC
controllers. 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
US expert to the IEC SC65E WG7 function block committee that
is responsible of the IEC61804 function block
standards. He is a voting member and chairman of ISA
SP104- EDDL (Electronic Device Description Language) and is
the technical advisor for IEC 65E USTAG. Also,
he is a member of USNC TAG (IEC/SC65 and
IEC/TC65). Terry authored “An Overview of
the ISA/IEC Fieldbus”, Section 11, Standards Overview, Fifth
Edition of Process/Industrial Instruments and Controls
Handbook and coauthored four sections in the Fourth Edition
of Instrumentation Engineer’s Handbook, Process Control and
Optimization. He coauthored the ISA bestseller book,
“Advanced Control Unleashed” and the book “Control Loop
Foundation – Batch and Continuous Processes” and
accompanying web site http://www.controlloopfoundation.com/
. Terry has 45 patents and has written over 70 papers
on process control system design and
applications. He regularly addresses process
control and simulation topics in the blog
http://modelingandcontrol.com/author/Terry-Blevins/ . Terry
received a BEE from the University of Louisville in 1971 and
a Master of Science degree in Electrical Engineering from
Purdue University in 1973. In 2004, Terry was induced
into Control Magazine’s Process Automation Hall of
Fame. Presently, Terry is a principal technologist in
the future architecture team of Emerson’s DeltaV Product
Engineering.
