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3-18

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

C79000-G7076-C504-02

3.9 Entering Ladder Elements

To select a network to allow you to enter LAD elements, click the network

name (for example, “Network 1”). When a network is selected you can, for

example, cut it, paste it again, or copy it.

To create a new network, select the menu command Insert

Network or

click the corresponding button in the toolbar. The new network is inserted

below the selected network. It only consists of one branch and one coil.

If you enter more elements than can be displayed on the screen, the network

is shifted to the left of the screen. To obtain a better overview, you can adjust

the display with the menu command View

Zoom In/Zoom Out/Zoom

Factor.

You go into a network by clicking a Ladder element with the mouse. Within

a network you can, in principle, select three areas with a mouse click:

S Ladder elements, for example, a contact or a box

S Junction points

S Empty instructions (lines or open branches)

You can select one area at a time with one mouse click. (Figure 3-11 shows

examples of selections. Here, a number of selections are shown

simultaneously.)

#r_ped

#condition #t_dur_y_car

#t_dur_g_ped

#condition

Figure 3-11 Possible Selections in a Ladder Network

You can choose the color of the selections yourself by selecting the menu

command Options

Customize to open the “LAD/FBD” tabbed page.

Handling Networks

Selecting Objects

in Networks

Creating Logic Blocks

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Siemens NAN 67 Series Wartungshandbuch Seite 42