Automating_with_STEP7_in_STL_and_SCL_-_Hans_Berger_bookmark_OCR.pdf

Hans Berger

Automating

with STEP 7 in •

STL and SCL

SIMATIC S7-300/400

Programmable Controllers

Automating with

STEP7inSTLand SCL

Programmable Controllers

SIMATIC S7-300/400

by Hans Berger

4th revised edition, 2007

Publicis Corporate Publishing

Bibliographic information from Die Deutsche Bibliothek

Die Deutsche Bibliothek lists this publication in the Deutsche Nationalbibliografie;

detailed bibliographic data are available on the Internet at http://dnb.ddb.de.

The programming examples concentrate on describing the STL and SCL functions and providing SIMATIC S7

users with programming tips for solving specific tasks with this controller.

The programming examples given in the book do not pretend to be complete solutions or to be executable on

future STEP 7 releases or S7-300/400 versions. Additional care must be taken in order to comply with the rel-

evant safety regulations.

The author and publisher have taken great care with all texts and illustrations in this book. Nevertheless, errors

can never be completely avoided. The publisher and the author accept no liability, regardless of legal basis, for

any damage resulting from the use of the programming examples.

The author and publisher are always grateful to hear your responses to the contents of the book.

Publicis Corporate Publishing

P.O. Box 3240

D-91052 Erlangen

www.publicis-erlangen.de/books

ISBN 978-3-89578-295-4

4th edition, 2007

Editor Siemens Aktiengesellschaft, Berlin and Munich

Publisher: Publicis Corporate Publishing, Erlangen

Any use of it outside the strict provisions of the copyright law without the consent of the

publisher is forbidden and will incur penalties. This applies particularly to reproduction,

translation, microfilming or other processing, and to storage or processing in electronic

system. It also applies to the use of extracts from the text.

Printed in Germany

Preface

The SIMATIC automation system unites all the

subsystems of an automation solution under a

uniform system architecture to form a homoge-

neous whole from the field level right up to pro-

cess control. This Totally Integrated Automa-

tion (TIA) enables integrated configuring and

programming, data management and communi-

cations throughout the complete automation

system.

400 automation system, it provides valuable,

practice-oriented information on the basic han-

dling of STEP 7 when configuring, networking

and programming SIMATIC PLCs. The

description of the "Basic Functions" of a binary

control, such as logic operations or latching/

unlatching functions, makes it particularly easy

for first-time users or users changing from relay

contactor controls to become acquainted with

STEP 7. The digital functions explain how dig-

ital values are combined; for example, basic

calculations, comparisons or data type conver-

sion.

As the basic tool for SIMATIC, STEP 7 plays

an integrating role in Totally Integrated Auto-

mation. STEP 7 is used to configure and pro-

gram the SIMATIC S7, SIMATIC C7 and

SIMATIC WinAC automation systems.

Microsoft Windows has been chosen as the

operating system to take advantage of the

familiar user interface of standard PCs as also

used in office environments.

The book shows how you can control program

processing (program flow) and design struc-

tured programs. In addition to the cyclically

processed main program, you can also incorpo-

rate event-driven program sections as well as

influence the behavior of the controller at star-

tup and in the event of errors/faults.

For block programming STEP 7 provides pro-

gramming languages that comply with DIN EN

6.1131-3: STL (statement list; an Assembler-

like language), LAD (ladder logic; a represen-

tation similar to relay logic diagrams), FBD

(function block diagram) and the S7-SCL

optional package (Structured Control Lan-

guage, a Pascal-like high-level language). Sev-

eral optional packages supplement these lan-

guages: S7-GRAPH (sequential control), S7-

HiGraph (programming with state-transition

diagrams) and CFC (connecting blocks; similar

to function block diagram). The various meth-

ods of representation allow every user to select

the suitable control function description. This

broad adaptability in representing the control

task to be solved significantly simplifies work-

ing with STEP 7.

One section of the book is dedicated to the

description of the SCL programming language.

SCL is especially suitable for programming

complex algorithms or for tasks in the data

management area, and it supplements STL

towards higher-level programming languages.

The book concludes with the description of a

program for converting STEP 5 programs to

STEP 7 programs, and a general overview of

the system functions and the function set for

STL and SCL.

The contents of this book describe Version 5.4

of the STEP 7 programming software and Ver-

sion 5.3 of the S7-SCL optional package.

This book describes the STL and SCL program-

ming languages for S7-300/400. As a valuable

supplement to the description of the languages,

and following an introduction to the S7-300/

Erlangen, April 2007

Hans Berger

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