Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 25)

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101

3-1

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

C79000-G7076-C504-02

Creating Logic Blocks

A user program cannot exist without logic blocks. In many situations, you

can use the blocks integrated on the CPU or the available standard function

blocks. You will, however, always have to create a number of logic blocks

yourself. This chapter describes how to create blocks using the LAD Editor.

Section Description Page

3.1 Creating Logic Blocks – Overview 3-2

3.2 Logic Blocks in the Editor 3-3

3.3 Structure of the Variable Declaration Table 3-6

3.4 Editing Variable Declaration Tables – Overview 3-8

3.5 Declaring Multiple Instances 3-10

3.6 Assigning System Attributes for Parameters 3-11

3.7 Editing the Code Section – Overview 3-13

3.8 Basic Guidelines for Entering Ladder Logic Instructions 3-15

3.9 Entering Ladder Elements 3-18

3.10 Creating Parallel Branches 3-21

3.11 Editing Addresses and Parameters 3-23

3.12 Symbolic Addressing 3-24

3.13 Editing in Overwrite Mode 3-26

3.14 Entering Titles and Comments 3-28

In This Chapter

Chapter Overview

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 317 318

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