Siemens SIMATIC STEP 7 V5.2 Getting Started page 41

Select the question marks and enter the corresponding names from the variable
declaration table (the # sign is assigned automatically).
Enter the symbolic name "Automatic_Mode" for the normally closed contact in the
series circuit.
Then save your program.
STEP 7 Getting Started
A5E00171228-01
Creating a Program with Function Blocks and Data Blocks
Check whether symbolic
representation is activated.
Local block variables are indicated with a # sign and are only valid in the
block.
Global variables appear in quotation marks. These are defined in the
symbol table and are valid for the entire program.
The signal state "Automatic_Mode" is defined in OB1 (Network 3; see page
4-7) by another SR element and now queried in FB1.
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