Programmable Logic Controller

Programmable Logic Controller Programmable Logic Controller Edited by Luiz Affonso Guedes Intech Published by Intech Intech Olajnica 19/2, 32000 Vukovar, Croatia Abstracting and non-profit use of the material is permitted with credit to the source. Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published articles. Publisher assumes no responsibility liability for any damage or injury to persons or property arising out of the use of any materials, instructions, methods or ideas contained inside. After this work has been published by the Intech, authors have the right to republish it, in whole or part, in any publication of which they are an author or editor, and the make other personal use of the work. © 2010 Intech Free online edition of this book you can find under www.sciyo.com Additional copies can be obtained from: publication@sciyo.com First published January 2010 Printed in India Technical Editor: Teodora Smiljanic Cover designed by Dino Smrekar Programmable Logic Controller, Edited by Luiz Affonso Guedes p. cm. ISBN 978-953-7619-63-3 Preface Despite the great technological advancement experienced in recent years, Programmable Logic Controllers (PLC) are still used in many applications from the real world and still play a central role in infrastructure of industrial automation. PLC operate in the factory-floor level and are responsible typically for implementing logical control, regulatory control strategies, such as PID and fuzzy-based algorithms, and safety logics. Usually PLC are interconnected with the supervision level through communication network, such as Ethernet networks, in order to work in an integrated form. The first PLC were computers designed to specific proposal that worked with simple digital inputs and outputs, and their programming language were based on relay logic. Currently there is a wide range of PLC manufacturers that offers products to automate from domestic activities up to large scale industrial processes. Thus, there is a PLC for each type and class of application. The most powerful PLC are equipped with sophisticated hardware and software infrastructure. But the small PLC have configuration software with good features too. Due to modern integrated automation concept, all components of the automation system must work interconnected through communication network and must be dotted of agile reconfiguration capability. Because PLC are the main equipments in several current automation solutions, there are a strong demand for standardized methodologies, technologies and software-based solutions to aid the various activities of the PLC programs development, such as modeling, validation, verification, test and automatic code generation. Other current demand is related with the difficulty in obtaining examples from the real world in order to explain how hard it is to develop application to PLC. In this context, this book was written by professionals that work and research in automation area and it has two major objectives. The first objective is present some advances in methodologies and techniques for development of industrial programs based on PLC. The second objective is present some PLC-based real applications from various areas such as manufacturing system, robotics, power system, communication system, and education. The book is organized in 10 chapters, where the first four are concerned with methodologies and techniques to develop PLC programs and the last six are PLC-based applications from the real world. We expect that the readers have basic knowledge of ... - tailieumienphi.vn