6-11
Primer: S7-300 Programmable Controller, Quick Start
C79000-G7076-C500-01
There are the following methods for inserting LAD elements:
S You can enter NO contacts, NC contacts, or coils via function keys F2, F3,
or F7 or you can select the icons for NO contacts, NC contacts, or coils
from the toolbar.
S You can select and insert LAD elements with the menu command Insert
→ LAD Element.
S In addition, you can select and insert program elements, for example,
timers, from a catalog. Open the “Program Elements” catalog with the
keys “Ctrl + K” or using the corresponding icon in the toolbar.
The table below shows you step-by-step how to enter LAD elements:
Step Procedure Result
1.
Start the assigned LAD editor by double-clicking
on FC1 in the SIMATIC Manager.
FC1 is opened and a split window appears with:
S The variable declaration table and
S The code section of the block.
2.
Select the menu command Insert→ Network to
create a new network or click on the relevant icon
in the toolbar.
The first network is displayed in the code section
of the open FC1. It contains a branch with a coil.
3.
Select the area below the network comment and
enter the LAD elements listed below via the
menu command Insert → LAD Element or
using the corresponding function keys.
After each element is entered, it is checked for
syntax errors. Elements containing errors are
displayed in red. These must be corrected before
the block is saved.
4.
Create a total of 11 networks as described above
and enter the elements in the relevant networks.
If no syntax errors are displayed (red background),
programming of FC1 is complete and you can now
save it.
5.
Save the complete and correctly created FC1
with the menu command File → Save
The block is saved.
6.
Then program OB1 in the same way. OB1 is programmed and saved on your
programming device/PC.
Methods of
Entering LAD
Elements
How Do You
Proceed?
Programming Logic Blocks with STEP 7
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