Robotics Automation

Control Loop Foundation - Batch and Continuous Processes by Terrence Blevins, Mark Nixon

By Terrence Blevins, Mark Nixon

During this in-depth publication, the authors handle the recommendations and terminology which are had to paintings within the box of method regulate. the cloth is gifted in a simple demeanour that's self sustaining of the regulate approach producer. it's assumed that the reader would possibly not have labored in a strategy plant setting and will be unusual with the sector units and regulate platforms. a lot of the cloth at the functional features of keep watch over layout and procedure functions is predicated at the authors own event won in operating with method keep watch over platforms. hence, the booklet is written to behave as a advisor for engineers, managers, technicians, and others which are new to strategy keep an eye on or skilled keep an eye on engineers who're strange with multi-loop keep an eye on strategies. After the normal single-loop and multi-loop concepts which are mainly utilized in are lined, a short advent to complex keep an eye on innovations is equipped. even if the reader of this e-book is operating as a approach keep watch over engineer, operating in a regulate team or operating in an software division, the knowledge will set the cast beginning had to comprehend and paintings with present keep watch over structures or to layout new regulate purposes. At a number of issues within the chapters on approach characterization and keep watch over layout, the reader has a chance to use what was once discovered utilizing web-based workshops. the one goods required to entry those workshops are a high-speed net connection and an internet browser. Dynamic approach simulations are outfitted into the workshops to provide the reader a pragmatic “hands-on” adventure. additionally, a few details is equipped on the net web site which may be invaluable in exploring uncomplicated and complicated keep watch over techniques.In addition to the net workshops, one bankruptcy of the publication is devoted to innovations which may be used to create method simulations utilizing instruments which are often to be had inside such a lot dispensed regulate systems.As keep an eye on options are brought, uncomplicated strategy examples are used to demonstrate how those concepts are utilized in undefined. The final bankruptcy of the ebook, on technique purposes, includes numerous extra advanced examples from that illustrate how easy regulate suggestions might be mixed to fulfill quite a few program requisites.

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Example text

Nearly identical boilers may be used in the powerhouse to meet the changing steam and electricity demands of the plant. When multiple similar pieces of equipment are installed in a process area, these pieces of equipment are referred to as process units. In the powerhouse area, the boilers may be identified by unit number, for example, as power boilers 1, 2, and 3. Process units – Pieces of equipment in a process area that are similar in construction and function. The number of process units that are contained in a process area may vary significantly depending on the product being manufactured and the plant capacity.

The operator’s job is to ensure correct plant operation in one or more process areas under all processing conditions. Also, the operator is responsible for changing area production rates to achieve planned plant production targets. If production in a process area is not on target and/or equipment is damaged due to improper action being taken in plant operation, the operator responsible for this area of the plant stands a good chance of receiving a reprimand. 14 CONTROL LOOP FOUNDATION: BATCH AND CONTINUOUS PROCESSES An important part of the plant operator’s job is to constantly monitor process operation and to work through the control system to make the adjustments necessary to maintain correct operating conditions for safety and environmental compliance while attaining scheduled production levels.

Some pneumatic control systems in use today have been in service for 20 or 30 years and most have done a good job. However, in many cases these systems can no longer be maintained and are being replaced with electronic control systems. Figure 2-6. Panel-based Analog Electronic Control System Even in the early panel-based electronic systems, there was the concept of using alarms to notify the operator of an abnormal operating condition. Such notification was provided using annunciator panels mounted in the control panel.

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