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

C79000-G7076-C504-02

Preface

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

(LAD) programming language. The manual explains the basic procedures for

creating programs. The online help contains more detailed information about

operating procedures.

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

functions of the language elements of Ladder Diagram.

The manual is intended for S7 programmers, operators, and

maintenance/service personnel. A working knowledge of automation

procedures is essential.

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

package.

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.

Purpose

Audience

Scope of the

Manual

Compliance with

Standards

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