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Tagged Content List
Blog Post:
Application of Kalman Filtering in DeltaV
Terry Blevins
A paper published in 1960 by Rudolf Kálmán “A New Approach to Linear Filtering and Prediction Problems” is the basis for the Kalman Filter. The Kalman filter has been successfully used in a wide variety of applications: • The guidance of commercial airplanes • Seismic data processing • Nuclear power...
on
10 Jun 2013
Blog Post:
Commissioning PI Control – Integrating Process
Terry Blevins
When the control objective is to maintain the controlled parameter of an integrating process at setpoint under all operating conditions, then using PI (proportional-integral or proportional plus reset) controller, it is possible to automatically compensate for changes in disturbance inputs and maintain...
on
27 May 2013
Blog Post:
Surge Tank Control
Terry Blevins
Intermediate liquid storage tanks (surge tanks) are commonly installed between processing areas of the plant. Under normal operating conditions, these storage buffers allow each process area to be operated independently of the other process areas. Any imbalance in the area production rates within a plant...
on
20 May 2013
Blog Post:
On-demand Tuning Example
Terry Blevins
Control system manufacturers have adopted different technologies to implement on-demand tuning. Because these tools are designed to work in a noisy process measurement environment, the tuning results are usually better than those achieved through manual tuning techniques. To illustrate the features that...
on
6 May 2013
Blog Post:
Selecting Control Response
Terry Blevins
After the process characteristics are identified, the information is then used to calculate the recommended loop tuning. The tuning rules used to derive controller parameters from process characteristics can be chosen as appropriate for the specific process and the desired speed of response. As addressed...
on
29 Apr 2013
Blog Post:
Performance Monitoring Tools
Terry Blevins
Many control system manufacturers and third party companies now offer tools that are designed to monitor process control and instrumentation performance. In addition to providing on-line information that summarizes control utilization, the user may access other information that may be helpful in determining...
on
9 Apr 2013
Blog Post:
Addressing Loop Interaction
Terry Blevins
In some cases, the manipulated parameter of one control loop can impact the controlled parameter of another control loop as illustrated below. To allow both loops to operate in automatic mode, loop interaction is most often addressed by simply detuning one of the control loops by reducing the proportional...
on
1 Apr 2013
Blog Post:
Split Range Setup
Terry Blevins
One of the most common ways of addressing multiple process inputs is split range control. A splitter block, which appears as one valve to the PID block, can be used in the control strategy to define a fixed relationship between the controller output and each manipulated process input. In Advanced Control...
on
25 Mar 2013
Blog Post:
Impact of Changing Process Gain
Terry Blevins
From a control perspective, it is highly desirable that the process gain is constant. If the process gain is constant, then the same proportional gain can be used over the entire operating range of the control loop. Using a control valve as an example, if the valve characteristic was not properly selected...
on
18 Mar 2013
Blog Post:
Evaluating Valve/Actuator Performance
Terry Blevins
When a control loop is placed in automatic control, it is easy to detect if a valve or actuator is not responding correctly to the control system. As discussed in Chapter 3 of Advanced Control Foundation – Tools, Techniques and Application, this can be done by observing the response of the controlled...
on
11 Mar 2013
Blog Post:
Identifying Transmitter Problems
Terry Blevins
One of the most obvious reasons for poor control utilization is a broken or unreliable transmitter or sensor. As addressed in Chapter 3 of Advanced Control Foundation – Tools, Techniques, and Applications, if the control system is designed to be consistent with the international function block standard...
on
25 Feb 2013
Blog Post:
Improving Control Utilization
Terry Blevins
When the utilization of a control loop is found to be low during normal plant operation, the measurement or control problems that prevent the control loop from functioning in its normal (designed) mode of operation should be further explored. In Chapter 3 of Advanced Control Foundation – Tools, Techniques...
on
18 Feb 2013
Blog Post:
Control Utilization
Terry Blevins
It can be shocking to examine control utilization in a plant where performance tools have not been installed and/or not used. For example, in the mid-1980s a control survey was conducted at a major pulp and paper plant where the control system had recently been updated to the latest distributed control...
on
11 Feb 2013
Blog Post:
Evaluating Control Performance
Terry Blevins
A plant operator is usually responsible for managing one or more process areas, with (potentially) hundreds of control loops and process measurements in each area. The operator’s job is made easier if the control loops in these process areas are in automatic mode and can compensate automatically for...
on
4 Feb 2013
Blog Post:
Assessment of Control Performance
Terry Blevins
To achieve the maximum benefit, the performance monitoring tools that are installed in control systems to evaluate plant control performance should contain features to support both analysis and diagnostics. Process Analysis is the examination of a process, its elements, and their relationships. Process...
on
28 Jan 2013
Blog Post:
The Semantic Web – Control Loop Foundation
Terry Blevins
When Mark Nixon and I wrote Control Loop Foundation – Batch and Continuous Processes we also worked with Paul Muston and Deb Franke to create a web site that goes with the book. Anyone may go to this web site to perform the 19 workshops that are included in the book. When you select a … Continue...
on
7 Jan 2013
Blog Post:
Future Technology Trends
Terry Blevins
Professor Åström is well known throughout the world for his work in process control. The book he co-authored with Tore Hägglund, Advanced PID Control, is one of the most comprehensive texts on this topic. In the early 1990’s Professor Åström was a consultant to the Emerson team that did the basic research...
on
17 Dec 2012
Blog Post:
Foundation Book Promotional Kit
Terry Blevins
The single loop and multi-loop control techniques most often used in automating continuous and batch processes are addressed in the book Control Loop Foundation – Batch and Continuous Processes. Similarly, the advanced control techniques that are most often utilized in the process industry are addressed...
on
10 Dec 2012
Blog Post:
Chinese Translation of Control Loop Foundation
Terry Blevins
A translation of the book Control Loop Foundation – Batch and Continuous Processes is now available on the ISA web site as an e-book in ePub or mobi format. The ePub format is used by most dedicated e-book readers such as Android devices and iPad, iPhone, and iPod, Kobo eReader and Sony Reader. The mobi...
on
3 Dec 2012
Blog Post:
Meet The Expert Session – Advanced Control Foundation
Terry Blevins
As I mentioned in an earlier blog, Willy Wojsznis and I hosted a Meet the Expert session at Emerson Exchange 2012 that covers key points contained in the book Advanced Control Foundation – Tools, Techniques, and Applications. Below is a picture from this session. I received permission from the Emerson...
on
12 Nov 2012
Blog Post:
Advanced Control Foundation at Emerson Exchange 2012
Terry Blevins
The International Society of Automation (ISA) always has a booth at Emerson Exchange to display books published by ISA and make these books available for purchased. The book that Mark Nixon, Willy Wojsznis, I co-authored this year, Advanced Control Foundation – Tools, Techniques, and Applications was...
on
5 Nov 2012
Blog Post:
Emerson Exchange 2012
Terry Blevins
If you attended Emerson Exchange 2012 in Anaheim, California, Oct 8-12th then I am sure you will agree this event exceeded all expectations. With over 350 workshops and short course to select from, it was always easy to find a presentation of interests. The exhibit area was open the first three days...
on
29 Oct 2012
Blog Post:
Advanced Control Foundation at ISA Automation Week 2012
Terry Blevins
If you are attending ISA Automation Week, 2012 then you may want to stop by the ISA book store in the exhibit area. Copies of Advanced Control Foundation were shipped earlier this week from the printer and arrive at the ISA bookstore late today, Tuesday, September 25. Thus, you might say these copies...
on
26 Sep 2012
Blog Post:
Control Loop Foundation Class – Nov 5-9
Terry Blevins
I worked closely with Emerson’s education department to establish the class Control Loop Foundation (9025). This 4 ½ day class is intended primarily for people who are new to the process industry and process control. Approximately 30% of the class is dedicated to workshops in which the students get hands...
on
17 Sep 2012
Blog Post:
Advanced Control Foundation – Book’s Web Site
Terry Blevins
A workshop is provided at the end of each chapter of Advanced Control Foundation – Tools, Techniques, and Applications that explores the technology. One of the unique features of the book is that the reader may view the workshop solution by going to the web site (http://www.advancedcontrolfoundation...
on
10 Sep 2012
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