Siemens SIMATIC STEP 7 V5.2 - Programming OB1 in Function Block Diagram

Creating a Program in OB1
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STEP 7 Getting Started
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4.4 Programming OB1 in Function Block Diagram
In the following section, you will program an AND function, an OR function, and a
memory function in Function Block Diagram (FBD).
Programming an AND Function in Function Block Diagram
If necessary, set FBD as the
programming language in the View
menu.
Click in the title area of OB1 and enter
"Cyclically processed main program,"
for example.
Select the input area for the AND
function (below the comment field).
Insert an AND box (&) and an
assignment (=).
The addresses of the elements are still
missing in the AND function.
Check whether symbolic
representation is activated.