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Preface, Contents Part 1: Designing Programs Part 2: Operating and Debugging

SIMATIC Structured Control Language (SCL) for S7-300/S7-400 Programming Manual

Part 3: Language Description Appendix Glossary, Index

This manual has the order number: 6ES7811-1CA02-8BA0

Safety Guidelines

This manual contains notices which you should observe to ensure your own personal safety, as well as to protect the product and connected equipment. These notices are highlighted in the manual by a warning triangle and are marked as follows according to the level of danger:

!

Danger
indicates that death, severe personal injury or substantial property damage will result if proper precautions are not taken.

!

Warning
indicates that death, severe personal injury or substantial property damage can result if proper precautions are not taken.

!

Caution
indicates that minor personal injury or property damage can result if proper precautions are not taken.

Note
draws your attention to particularly important information on the product, handling the product, or to a particular part of the documentation.

Qualified Personnel

The device/system may only be set up and operated in conjunction with this manual. Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and systems in accordance with established safety practices and standards.

Correct Usage

Note the following:

!

Warning
This device and its components may only be used for the applications described in the catalog or the technical description, and only in connection with devices or components from other manufacturers which have been approved or recommended by Siemens.

Trademarks

SIMATICR, SIMATIC NETR and SIMATIC HMIR are registered trademarks of SIEMENS AG. Third parties using for their own purposes any other names in this document which refer to trademarks might infringe upon the rights of the trademark owners.

Copyright E Siemens AG 1998 All rights reserved

Disclaimer of Liability

The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility model or design, are reserved. Siemens AG Bereich Automatisierungs- und Antriebstechnik Geschaeftsgebiet Industrie-Automatisierungssysteme Postfach 4848, D-90327 Nuernberg

We have checked the contents of this manual for agreement with the hardware and software described. Since deviations cannot be precluded entirely, we cannot guarantee full agreement. However, the data in this manual are reviewed regularly and any necessary corrections included in subsequent editions. Suggestions for improvement are welcomed. E Siemens AG 1998 Technical data subject to change.

Siemens Aktiengesellschaft

6ES7811-1CA02-8BA0

ii

Structured Control Language (SCL) for S7-300/S7-400, Programming C79000 G7076 C522 01

Preface

Purpose

This manual is your guide to creating user programs in the Structured Control Language (SCL) programming language. The manual explains the basic procedures for creating programs using the SCL editor, SCL compiler and SCL debugger. This manual also includes a reference section that describes the syntax and functions of the language elements of SCL.

Audience

This manual is intended for S7 programmers, commissioning engineers, and maintenance/service personnel. A working knowledge of automation procedures is essential.

Scope of the Manual

This manual is valid for release 3.0 of the STEP 7 standard programming software package.

Compliance with Standards

SCL corresponds to the Structured Control Language defined in the DIN EN-61131-3 (IEC 1131-3) standard, although there are essential differences with regard to the operations....
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