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2-4

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

C79000-G7076-C504-02

2.2 Creating User Programs – Overview

A user program that runs on an S7 CPU is essentially made up of blocks. It

also contains information such as data about the system configuration and

about system networking. Depending on your application, the user program

will include the following elements:

S Organization blocks (OBs)

S Function blocks (FBs)

S Functions (FCs)

S Data blocks (DBs)

To simplify your work, you can create your own user-defined data types

(UDTs), which can be used either as data types in their own right or as a

template for creating data blocks.

Some of the frequently used blocks such as the system function blocks

(SFBs) and the system functions (SFCs) are integrated on the CPU. Other

blocks (for example blocks for IEC functions or closed-loop controller

blocks) are available as separate packages. You do not need to program these

blocks but simply load them into your user program.

Note

You can check which SFBs and SFCs are integrated on your CPU online by

clicking PLC

Module Information... in the menu bar.

The STEP 7 standard software includes an editor for programming blocks.

The editor can be set to the LAD programming language

to allow you to

program logic blocks (OBs, FBs, FCs). The

LAD Editor works incrementally,

which means that the syntax of each entry you make is checked. Syntax

errors are reported and illegal arrangements of LAD elements or addresses

are rejected immediately.

The

LAD Editor is started from the SIMATIC Manager. You must first create

a project containing an S7 program in the SIMATIC Manager before you can

call the editor. The program you create can be either dependent or

independent of the hardware. You either add the S7 program directly into the

project or edit the S7 program assigned to the programmable module. The

program itself can contain the user program (blocks), source files, or charts.

With the LAD Editor, you can only edit blocks stored in the folder of the user

program.

User Program

LAD Incremental

Editor

Starting from the

SIMATIC Manager

Introduction

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