plcs - Table of Contents Introduction.2 PLCs.4...

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1 Table of Contents Introduction . ............................................................................. 2 PLCs . ........................................................................................ 4 Number Systems. ..................................................................... 8 Terminology . ........................................................................... 12 Basic Requirements. ............................................................... 18 S7-200 Micro PLCs. ................................................................ 20 Programming a PLC. ............................................................... 33 Discrete Inputs/Outputs . ........................................................ 41 Analog Inputs and Outputs. .................................................... 48 Timers. .................................................................................... 51 Counters. ................................................................................ 58 High-Speed Instructions . ........................................................ 61 Specialized Expansion Modules . ............................................ 65 Review Answers. .................................................................... 72 Final Exam . ............................................................................. 73 quickSTEP Online Courses . .................................................... 76
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2 Introduction Welcome to another course in the STEP series, S iemens T echnical E ducation P rogram, designed to prepare our distributors to sell Siemens Energy & Automation products more effectively.This course covers Basics of PLCs and related products. Upon completion of Basics of PLCs you should be able to: Identify the major components of a PLC and describe their functions Convert numbers from decimal to binary, BCD, and hexadecimal Identify typical discrete and analog inputs and outputs Identify key differences of the various S7-200 models Identify the types of expansion modules available for S7-200 PLCs Describe the types or programming available for S7-200 PLCs Describe the operation of commonly used program functions such as timers and counters Identify the proper manual to refer to for programming or installation of an S7-200 PLC
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3 This knowledge will help you better understand customer applications. In addition, you will be better able to describe products to customers and determine important differences between products. You should complete Basics of Electricity before attempting Basics of PLCs . An understanding of many of the concepts covered in Basics of Electricity is required for Basics of PLCs . In addition, you may wish to complete Basics of Control Components . Devices covered in Basics of Control Components are used with programmable logic controllers. If you are an employee of a Siemens Energy & Automation authorized distributor, fill out the final exam tear-out card and mail in the card. We will mail you a certificate of completion if you score a passing grade. Good luck with your efforts. Siemens is a trademark of Siemens AG. Product names mentioned may be trademarks or registered trademarks of their respective companies. Specifications subject to change without notice.
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4 PLCs A programmable logic controller (PLC) , also referred to as a programmable controller , is the name given to a type of computer commonly used in commercial and industrial control applications. PLCs differ from office computers in the types of tasks that they perform and the hardware and software they require to perform these tasks. While the specific applications vary widely, all PLCs monitor inputs and other variable values, make decisions based on a stored program, and control outputs to automate a process or machine.This course is meant to supply you with basic information on the functions and configurations of PLCs with emphasis on the S7-200 PLC family.
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plcs - Table of Contents Introduction.2 PLCs.4...

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