Siemens NAN 67 Series Wartungshandbuch PDF herunterladen (Seite 45)

3-21

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

C79000-G7076-C504-02

3.10 Creating Parallel Branches

To create OR instructions in the Ladder programming language, you need to

create parallel branches.

Use the following guidelines to edit parallel branches:

S Draw OR branches from left to right

S Parallel branches are opened downwards and closed upwards

S Open a parallel branch with the menu command Insert

LAD Element...

Open Branch, with function key F8 or with the corresponding button in

the toolbar.

S Close a parallel branch with the menu command Insert

LAD

Element...

Close Branch, with function key F9 or with the

corresponding button in the toolbar.

S A parallel branch is always opened in front of the selected element

S A parallel branch is always closed after the selected element

S To delete a parallel branch, delete all the elements in the branch. When

the last element in the branch is deleted, the OR branch is automatically

removed.

If you want to open a new branch, select the starting point of the branch

below which you want to insert a new branch. You create the new branch

with

F8 (see Figure 3-13).

To create a closed branch, select the element in front of which you want to

open a parallel branch. Open the parallel branch with

F8, insert the Ladder

elements and close the branch again with

F9.

When you close parallel branches, the necessary empty elements are added.

If necessary, the branches are arranged so that branch crossovers are avoided.

If you close the branch directly from the parallel branch, the branch is closed

after the next possible Ladder element.

Figure 3-13 shows an example of how to create a parallel branch using only

function keys and buttons in the toolbar.

Application

Guidelines

Creating New

Branches

Creating a Closed

Branch

Creating Logic Blocks

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