Programmable Controllers: Theory and Implementation

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Introduction to PLC Programming and Implementation—from relay logic to PLC logic© 1999 by Industrial Text and Video CompanyPublished by Industrial Text and Video CompanyAll rights reserved.Reproduction or translation of any part of this work beyondthat permitted by Sections 107 and 108 of the 1976 UnitedStates Copyright act are unlawful.Requests for permission, accompanying workbooks, orfurther information should be addressed to:Industrial Text and Video Company1950 Spectrum CircleTower A-First FloorMarietta, Georgia 30067(770) 240-2200(800) PLC-TEXTDue to the nature of this publication and because of the different applications ofprogrammable controllers, the readers or users and those responsible for applying theinformation herein contained must satisfy themselves to the acceptability of eachapplication and the use of equipment therein mentioned. In no event shall the publisherand others involved in this publication be liable for direct, indirect, or consequentialdamages resulting from the use of any technique or equipment herein mentioned.The illustrations, charts, and examples in this book are intended solely to illustrate themethods used in each application example. The publisher and others involved in thispublication cannot assume responsibility or liability for actual use based on theillustrative uses and applications.No patent liability is assumed with respect to use of information, circuits, illustrations,equipment, or software described in this text.Industrial Text & Video Company www.industrialtext.com 1-800-752-83982
Introduction to PLC Programming and Implementation—from relay logic to PLC logicContents1 CONTROL TASK DEFINITION ..............................................................42 CONTROL STRATEGY .......................................................................43 IMPLEMENTATION GUIDELINES ............................................................54 PROGRAM ORGANIZATION AND IMPLEMENTATION....................................6CREATING FLOWCHARTS AND OUTPUT SEQUENCES................................7CONFIGURING THE PLC SYSTEM .....................................................10REAL AND INTERNAL I/O ASSIGNMENT ..............................................10REGISTER ADDRESS ASSIGNMENT ....................................................15ELEMENTS TO LEAVE HARDWIRED ....................................................15SPECIAL INPUT DEVICE PROGRAMMING .............................................17PROGRAM CODING/TRANSLATION.....................................................245 DISCRETE I/O CONTROL PROGRAMMING ...........................................25CONTROL PROGRAMMING AND PLC DESCRIPTIONS.............................26SIMPLE RELAY REPLACEMENT..........................................................27SIMPLE START/STOP MOTOR CIRCUIT ...............................................29FORWARD/REVERSE MOTOR INTERLOCKING ........................................33REDUCED-VOLTAGE-START MOTOR CONTROL.....................................37AC MOTOR DRIVE INTERFACE ........................................................40CONTINUOUS BOTTLE-FILLING CONTROL...........................................44LARGE RELAY SYSTEM MODERNIZATION ............................................47STUDY GUIDE ..................................................................................54REVIEW QUESTIONS ..........................................................................55ANSWERS........................................................................................64Industrial Text & Video Company www.industrialtext.com 1-800-752-83983
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Programmable Controllers: Theory and Implementation

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