Step 6: Creating An F-Fb - Siemens SIMATIC S7 Functional Safety Manual

2.3.3

Step 6: Creating an F-FB

In this step, you create the F-FB where you will program the safety functions for this
example.
Click the "Play" button to start the animation file. Click the other control elements to rewind,
pause, go back, or go forward.
Procedure
1. Insert an F-FB. Go to the "Program blocks" folder of the fail-safe CPU and double-click
"Add new block".
The "Add new block" dialog opens.
2. Under "Name" enter "Safety_Interlock" for the name of the F-FB.
3. Click the "Function block" button on the left.
4. Select "FBD" as the language for the F-FB.
5. Under "Number" choose the "Manual" option, and enter 100.
6. Ensure that you select the "Create F-block" check box so that a fail-safe function block is
created.
7. Close the dialog box with "OK"
Result
The F-FB "Safety_Interlock" is created in the "Program blocks" folder and opens
automatically in the "FBD Editor".
You can now continue with programming the safety functions in the next step.
S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA
Getting started
2.3 Programming
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