STEP7_LAD_e.pdf

Preface,

Contents

Bit Logic Instructions

SIMATIC

Comparison Instructions

Conversion Instructions

Ladder Logic (LAD) for

S7-300 and S7-400

Programming

Reference Manual

Counter Instructions

Data Block Instructions

Logic Control Instructions

Integer Math Instructions

Floating Point Math

Instructions

Move Instructions

Program Control Instructions

Shift and Rotate Instructions

Status Bit Instructions

Timer Instructions

Word Logic Instructions

Appendix

This manual is part of the documentation

package with the order number:

6ES7810-4CA08-8BW1

Overview of All LAD

Instructions

Programming Examples

Edition 03/2006

A5E00706949-01

Working with Ladder Logic

Index

Safety Guidelines

This manual contains notices you have to observe in order to ensure your personal safety, as well as to

prevent damage to property. The notices referring to your personal safety are highlighted in the manual

by a safety alert symbol, notices referring to property damage only have no safety alert symbol. The

notices shown below are graded according to the degree of danger.

Danger

indicates that death or severe personal injury will result if proper precautions are not taken.

Warning

indicates that death or severe personal injury may result if proper precautions are not taken.

Caution

with a safety alert symbol indicates that minor personal injury can result if proper precautions are not

taken.

Caution

without a safety alert symbol indicates that property damage can result if proper precautions are not

taken.

Notice

indicates that an unintended result or situation can occur if the corresponding notice is not taken into

account.

If more than one degree of danger is present, the warning notice representing the highest degree of

danger will be used. A notice warning of injury to persons with a safety alert symbol may also include a

warning relating to property damage.

Qualified Personnel

The device/system may only be set up and used in conjunction with this documentation. Commissioning

and operation of a device/system may only be performed by qualified personnel . Within the context of

the safety notices in this documentation qualified persons are defined as persons who are authorized to

commission, ground and label devices, systems and circuits in accordance with established safety

practices and standards.

Prescribed 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.

Correct, reliable operation of the product requires proper transport, storage, positioning and assembly

as well as careful operation and maintenance.

Trademarks

All names identified by ® are registered trademarks of the Siemens AG.

The remaining trademarks in this publication may be trademarks whose use by third parties for their

own purposes could violate the rights of the owner.

Disclaimer of Liability

We have reviewed the contents of this publication to ensure consistency with the hardware and

software described. Since variance cannot be precluded entirely, we cannot guarantee full consistency.

However, the information in this publication is reviewed regularly and any necessary corrections are

included in subsequent editions.

Siemens AG

Automation and Drives

Postfach 4848

90437 NÜRNBERG

GERMANY

A5E00706949-01

03/2006

Technical data subject to change

Preface

Purpose

This manual is your guide to creating user programs in the Ladder Logic (LAD)

programming language.

This manual also includes a reference section that describes the syntax and

functions of the language elements of Ladder Logic.

Basic Knowledge Required

The manual is intended for S7 programmers, operators, and maintenance/service

personnel.

In order to understand this manual, general knowledge of automation technology is

required.

In addition to, computer literacy and the knowledge of other working equipment

similar to the PC (e.g. programming devices) under the operating systems

MS Windows 2000 Professional, MS Windows XP Professional or MS Windows

Server 2003 are required.

Scope of the Manual

This manual is valid for release 5.4 of the STEP 7 programming software package.

Compliance with IEC 1131-3

LAD corresponds to the “Ladder Logic” language defined in the International

Electrotechnical Commission's standard IEC 1131-3. For further details, refer to the

table of standards in the STEP 7 file NORM_TBL.WRI.

Ladder Logic (LAD) for S7-300 and S7-400 Programming

A5E00706949-01

iii

Preface

Requirements

To use this Ladder Logic manual effectively, you should already be familiar with the

theory behind S7 programs which is documented in the online help for STEP 7.

The language packages also use the STEP 7 standard software, so you should be

familiar with handling this software and have read the accompanying

documentation.

This manual is part of the documentation package "STEP 7 Reference".

The following table displays an overview of the STEP 7 documentation:

Documentation

Purpose

Order Number

STEP 7 Basic Information with

• Working with STEP 7,

Getting Started Manual

• Programming with STEP 7

• Configuring Hardware and

Communication Connections,

STEP 7

• From S5 to S7, Converter Manual

Basic information for technical

personnel describing the methods

of implementing control tasks with

STEP 7 and the S7-300/400

programmable controllers.

6ES7810-4CA08-8BW0

STEP 7 Reference with

• Ladder Logic (LAD) / Function Block

Diagram (FDB) / Statement List (STL)

for S7-300/400 manuals

• Standard and System Function

for S7-300/400

Volume 1 and Volume 2

Provides reference information

and describes the programming

languages LAD, FBD and STL,

and standard and system function

extending the scope of the

STEP 7 basic information.

6ES7810-4CA08-8BW1

Online Helps

Purpose

Order Number

Help on STEP 7

Basic information on

programming and configuring

hardware with STEP 7 in the form

of an online help.

Part of the STEP 7

Standard software.

Reference helps on AWL/KOP/FUP

Reference help on SFBs/SFCs

Reference help on Organization Blocks

Context-sensitive reference

information.

Part of the STEP 7

Standard software.

Ladder Logic (LAD) for S7-300 and S7-400 Programming

A5E00706949-01

Preface

Online Help

The manual is complemented by an online help which is integrated in the software.

This online help is intended to provide you with detailed support when using the

software.

The help system is integrated in the software via a number of interfaces:

• The context-sensitive help offers information on the current context, for

example, an open dialog box or an active window. You can open the context-

sensitive help via the menu command Help > Context-Sensitive Help , by

pressing F1 or by using the question mark symbol in the toolbar.

• You can call the general Help on STEP 7 using the menu command Help >

Contents or the "Help on STEP 7" button in the context-sensitive help window.

• You can call the glossary for all STEP 7 applications via the "Glossary" button.

This manual is an extract from the "Help on Ladder Logic". As the manual and the

online help share an identical structure, it is easy to switch between the manual

and the online help.

Further Support

If you have any technical questions, please get in touch with your Siemens

representative or responsible agent.

You will find your contact person at:

http://www.siemens.com/automation/partner

You will find a guide to the technical documentation offered for the individual

SIMATIC Products and Systems here at:

http://www.siemens.com/simatic-tech-doku-portal

The online catalog and order system is found under:

http://mall.automation.siemens.com/

Training Centers

Siemens offers a number of training courses to familiarize you with the SIMATIC

S7 automation system. Please contact your regional training center or our central

training center in D 90327 Nuremberg, Germany for details:

Telephone: +49 (911) 895-3200.

Internet: http://www.sitrain.com

Ladder Logic (LAD) for S7-300 and S7-400 Programming

A5E00706949-01

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