PLC_Basics of PLCs_s7-200(1).pdf

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Basics of PLCs
STEP 2000
Basics of PLCs
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Table of Contents
Introduction ..............................................................................2
PLCs .........................................................................................4
Number Systems......................................................................8
Terminology ............................................................................ 14
Basic Requirements................................................................23
S7-200 Micro PLCs .................................................................28
Connecting External Devices..................................................39
Programming A PLC ...............................................................41
Discrete Inputs/Outputs .........................................................49
Analog Inputs and Outputs.....................................................61
Timers.....................................................................................64
Counters ................................................................................. 71
High-Speed Instructions .........................................................75
Specialized Expansion Modules .............................................78
Review Answers.....................................................................84
Final Exam ..............................................................................85
1
Introduction
Welcome to another course in the STEP 2000 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
• Read a basic ladder logic diagram and statement list
• Identify operational differences between different S7-200
models
• Identify the proper manual to refer to for programming or
installation of an S7-200 PLC
• Connect a simple discrete input and output to an S7-200
• Select the proper expansion module for analog inputs and
outputs
• Describe the operation of timers and counters
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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.
SIMATIC, STEP 7, STEP 7-Micro, STEP 7-Micro/WIN, PG 702,
and PG 740 are registered trademarks of Siemens Energy &
Automation, Inc.
Other trademarks are the property of their respective owners.
3
PLCs
Programmable Logic Controllers (PLCs), also referred to as
programmable controllers, are in the computer family. They are
used in commercial and industrial applications. A PLC monitors
inputs, makes decisions based on its program, and controls
outputs to automate a process or machine. This course is meant
to supply you with basic information on the functions and
configurations of PLCs.
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