Siemens SIMATIC S7 Configuration And Programming Manual page 54

Note
if your new F-library is not displayed in the FBD/LAD editor, open and close the
FBD/LAD editor.
By repeating the steps outlined above, you can create as many F-libraries for
S7 Distributed Safety as you wish.
Working with User-Created F-Libraries
To use F-FBs/F-FCs/application templates from user-created F-libraries, you must
have the S7 Distributed Safety version installed on your PC/PG with which the
F-FBs, F-FCs or application templates were created.
You yourself must check whether or not an existing user-created F-library is still up
to date. If necessary, you must replace a user-created F-library with a newer
version. S7 Distributed Safety does not check the versions of the F-FBs/F-FCs in a
user-created F-library. When you compile a safety program, there is also no
automatic replacement of F-FBs/F-FCs from a user-created F-library with
corresponding F-FBs/F-FCs from a newer version of this F-library. If necessary,
copy the F-FBs/F-FCs with a new version from the user-created F-library into the
block container of your current S7 program.
You cannot use symbolic names of F-application blocks of the F-Library Distributed
Safety (V1) for user-created F-FBs, F-FCs, and blocks.
In terms of handling of the F-FBs/F-FCs/application templates from user-created
F-libraries, there is no difference compared with the F-library Distributed Safety
(V1).
Removing S7 Distributed Safety
When you remove S7 Distributed Safety, the user-created F-libraries are retained.
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