Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 28)

3-4

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

C79000-G7076-C504-02

When you open a logic block, a window appears displaying the following:

S The variable declaration table of the block in the upper part

S The code section in the lower part, in which you edit the actual block

code

FB6-<Offline>

Network 1 : Red for road traffic

Network 2 : Green for road traffic

#starter

#condition

#condition #g car

#t_next_red_car #t_dur_r_car

Network 3 : Start permanent amber for cars

#condition #g car

S5T#3S

Address Decl. Symbol Data Type Initial Value Comment

dur_g_p

del_r_p

starter

t_dur_g_ped

S5TIME

BOOL

TIMER

S5T#0MS

FALSE

0.0

2.0

4.0

6.0

8.0

t_dur_y_car TIMER

FB6-<Offline>-LAD/STL/FBD: Programming S7 Blocks

File Edit Insert Debug View Options Window HelpPLC

Figure 3-2 Variable Declaration Table and Code Section in LAD

The block properties are edited in their own dialog (see Chapter 5).

The editor allows you enables you to open and work on several blocks

simultaneously.

The variable declaration table and the code section are closely linked as the

names from the variable declaration table are used in the code section. This

means that changes in the variable declaration table also affect the code

section and therefore the entire block.

Main Window of

the LAD Editor

Relationship

between the

Variable

Declaration and

Code Section

Creating Logic Blocks

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