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

C79000-G7076-C504-02

Product Overview

LAD stands for Ladder Logic. LAD is a graphic programming language. The

syntax of the instructions is similar to a circuit diagram. With Ladder Logic,

you can follow the signal flow between power rails via inputs, outputs, and

instructions.

The programming language Ladder Logic has all the necessary elements for

creating a complete user program. It contains the complete range of basic

instructions and a wide range of addresses are available. Functions and

function blocks allow you to structure your LAD program clearly.

The

LAD Programming Package is an integral part of the STEP 7 Standard

Software. This means that following the installation of your STEP 7 software,

all the

editor functions, compiler functions, and test/debug functions for LAD

are available to you.

Using LAD, you can create your own user program with the Incremental

Editor. The input of the local block data structure is made easier with the

help of table editors.

There are three programming languages in the standard software, STL, FBD,

and LAD. You can switch from one language to the other almost without

restriction and choose the most suitable language for the particular block you

are programming.

If you write programs in LAD or FBD, you can always switch over to the

STL representation. If you convert LAD programs into FBD programs and

vice versa, program elements that cannot be represented in the destination

language are displayed in STL.

What is LAD?

The Programming

Language Ladder

Logic

The Programming

Package

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