Jun
09
This last week I gave a paper presentation at the American Control Conference, Portland, OR. The topic of this paper was PID Control Using Wireless Measurements. I co-authored the paper with Mark Nixon and Willy Wojsznis. Below is a picture taken during the presentation. This paper presents a wireless PID controller, known as PIDPlus. The …
May
05
A book goes through many reviews and edits before it can be published. Still, it is very difficult for the authors and reviewers to catch all the typo’s in the original text and those that are introduced during the type setting process (formatting for publication). ISA recently notified me that the book that Mark Nixon …
Mar
24
Over the last five years a wide variety of WirelessHART transmitters have been introduced by the major manufacturers of field devices. The PIDPlus enables closed loop control using the slower update rate provided by a wireless transmitter. The broad acceptance of wireless transmitters has generated an interest in the application of wireless throttling valves in …
Feb
24
The 2014 American Control Conference, ACC, will be held Wednesday through Friday, June 4 – 6, at the Hilton Portland & Executive Tower, Portland, OR. As noted on the conference web site, the ACC is internationally recognized as a premier scientific and engineering conference dedicated to the advancement of control theory and practice. Last year …
Dec
09
Wireless transmitters may be preferred in applications where new measurements are required since the cost may be lower than that associated with installing wired transmitters. However, there is a significant differences in the frequency and manner in which a new measurement value is updated by a wired transmitter vs. a wireless transmitter. Such differences must …
Nov
04
Several Meet the Expects workshops are schedule on the last day of Emerson Exchange. As part of this effort, Willy Wojsznis and I co-hosted a workshop this year titled Utilizing DeltaV Advanced Control Innovations to Improve Control Performance. In this workshop we explore and discuss innovative features of the DeltaV PID and embedded Advanced Control …
Oct
28
In Emerson’s boot camp for new engineers, I teach the portion on process control based on our book Control Loop Foundation – Batch and Continuous Processes. Each student receives a copy of this book. Customer may receive the same process control training by attending a 4 ½ day class, Control Loop Foundation – 9025, offered …
Oct
07
When a measurement used in a control application is characterized by a significant amount of process or measurement noise then to avoid taking control action on noise filtering may be applied in the transmitter or in the control system. However, when traditional filtering techniques are used it is necessary to increase the PID reset time …
Sep
16
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 uses a dynamics model, measured control input(s) and process measurement(s) to estimate the process output. A wide variety of applications have successfully utilized Kalman filtering: The guidance of …
Sep
09
A number of technical challenges must be addressed when using a wireless measurement in closed loop control. In DeltaV v11 we introduced a PID option known as PIDPlus that may be selected when a wireless transmitter is used in a control application. When the PIDPlus option is selected then the same quality control as wired …
