Aislamiento

Programmable Logic Controllers
Basic Level

Textbook TP 301

Festo Didactic
093311 en

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Authorised applications and liability
The Learning System for Automation and Technology has been developed and prepared exclusively for training in the field of automation. The
training organization and/or trainee shall ensurethat the safety precautions described in the accompanying Technical documentation are fully
observed.
Festo Didactic hereby excludes any liability for injury to trainees, to the
training organization and/or to third parties occurring as a result of the
use or application of the station outside of a pure training situation, unless caused by premeditation or gross negligence on the part of FestoDidactic.
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093311
SPS LB GS
D.LB-TP301–1-GB
08/2002
28.08.2002, OCKER Ingenieurbüro
D. Schwarzenberger, OCKER Ingenieurbüro
R. Bliesener, F.Ebel, C.Löffler, B. Plagemann,
H.Regber, E.v.Terzi, A. Winter

© Copyright by Festo Didactic GmbH & Co., D-73770 Denkendorf 2002
The copying, distribution andutilization of this document as well as the
communication of its contents to others without expressed authorization
is prohibited. Offenders will be held liable for the payment of damages.
All rights reserved, in particular the right to carry out patent, utility model
or ornamental design registrations.
Parts of this training documentation may be duplicated, solely for training
purposes, by personsauthorised in this sense.

TP301 • Festo Didactic

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Preface
The programmable logic controller represents a key factor in industrial
automation. Its use permits flexible adaptation to varying processes as
well as rapid fault finding and error elimination.
This textbook explains the design of a programmable logic controller and
its interaction with peripherals.
One of the mainfocal points of the textbook deals with the new international standard for PLC programming, the EN 61131-3 (IEC-61131-3).
This standard takes into account expansions and developments, for
which no standardised language elements existed hitherto.
The aim of this new standard is to standardise the design, functionality
and the programming of a PLC in such a way as to enable the user to
easilyoperate with different systems.
In the interest of continual further improvement, all readers of this book
are invited to make contributions by way suggestions, ideas and constructive criticism.
August 2002

TP301 • Festo Didactic

The authors

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TP301 • Festo Didactic

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Table of Contents
Chapter 1 Automating with a PLC

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1.1

Introduction

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1.2

Areas ofapplication of a PLC

B-2

1.3

Basic design of a PLC

B-5

1.4

The new PLC standard EN 61131 (IEC 61131)

B-8

Chapter 2 Fundamentals

B-11

2.1

The decimal number system

B-11

2.2

The binary number system

B-11

2.3

The BCD code

B-13

2.4

The hexadecimal number system

B-13

2.5

Signed binary numbers

B-14

2.6

Real numbers

B-142.7

Generation of binary and digital signals

B-15

Chapter 3 Boolean operations

B-19

3.1

Basic logic functions

B-19

3.2

Further logic operations

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3.3

Establishing switching functions

B-25

3.4

Simplification of logic functions

B-28

3.5

Karnaugh-Veitch diagram

B-30

TP301 • Festo Didactic

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Chapter 4 Design and mode of operationof a PLC

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4.1

Structure of a PLC

B-33

4.2

Central control unit of a PLC

B-35

4.3

Function mode of a PLC

B-37

4.4

Application program memory

B-39

4.5

Input module

B-41

4.6

Output module

B-43

4.7

Programming device/Personal computer

B-45

Chapter 5 Programming of a PLC

B-47

5.1

Systematic solution finding

B-47...