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3-13

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

C79000-G7076-C504-02

3.7 Editing the Code Section – Overview

In the code section you describe the program sequence of your logic block.

To do this, you form networks from Ladder elements. In most cases, the code

section of a logic block is made up of several networks. After you have

entered a Ladder element, the editor runs a check and shows you if any

entries were incorrect (errors are shown in red). Elements placed incorrectly

are rejected with an error message.

In a code section, you can edit the block title, network titles, block

comments, network comments, and, of course, the statements within the

networks.

TRAFFIC\...\FB6 - <Offline>

#starter

#condition

#condition#t_next_red_car #t_dur_r_car

#condition #g_car

FB6 : Traffic Light

Controlling a set of traffic lights for a pedestran crossing on a main street.

Network 1 : Red request for road traffic

The red request from road traffic is activated by a start input when the time between two

red phases for road traffic is running.

Network 2 : Green for road traffic

The traffic lights turn green when there is no request for red.

Block title

Block

comment

Network

title

Network

comment

Ladder

elements

Figure 3-6 Structure of the Code Section

Code Section

Editable Parts of

the Code Section

Creating Logic Blocks

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 317 318

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