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NewnesisanimprintofElsevier30CorporateDrive,Suite400,Burlington,MA01803,USALinacreHouse,JordanHill,OxfordOX28DP,UKCopyright#2009,ElsevierLtd.Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofthepublisher.PermissionsmaybesoughtdirectlyfromElsevier’sScience&TechnologyRightsDepartmentinOxford,UK:phone:(þ44)1865843830,fax:(þ44)1865853333,E-mail:permissions@elsevier.com.YoumayalsocompleteyourrequestonlineviatheElsevierhomepage(http://elsevier.com),byselecting“Support&Contact”then“CopyrightandPermission”andthen“ObtainingPermissions.”LibraryofCongressCataloging-in-PublicationDataApplicationsubmitted.BritishLibraryCataloguing-in-PublicationDataAcataloguerecordforthisbookisavailablefromtheBritishLibrary.ISBN:978-1-85617-751-1ForinformationonallNewnespublicationsvisitourWebsiteatwww.elsevierdirect.com091011121310987654321PrintedintheUnitedStatesofAmericaPrefaceTechnologicaladvancesinrecentyearshaveresultedinthedevelopmentoftheprogrammablelogiccontroller(PLC)andaconsequentialrevolutionofcontrolengineering.Thisbook,anintroductiontoPLCs,aimstoeasethetasksofpracticingengineerscomingintocontactwithPLCsforthefirsttime.ItalsoprovidesabasiccourseforstudentsincurriculasuchastheEnglishtechnicians’coursesforNationalsandHigherNationalsinEngineering,givingfullsyllabuscoverageoftheNationalandHigherNationalinEngineeringunits,companytrainingprograms,andservingasanintroductionforfirst-yearundergraduatecoursesinengineering.Thebookaddressestheproblemofvariousprogrammablecontrolmanufacturersusingdifferentnomenclatureandprogramformsbydescribingtheprinciplesinvolvedandillustratingthemwithexamplesfromarangeofmanufacturers.Thetextincludes:•ThebasicarchitectureofPLCsandthecharacteristicsofcommonlyusedinputandoutputstosuchsystems•Adiscussionofthenumbersystems:denary,binary,octal,hexadecimal,andBCD•A
