Siemens SIMATIC S7 Configuration And Programming Manual page 42

Note
Assign a unique name for the backup copy so that you can later identify the
F-FB/F-FC and the protected F-FB/F-FC (for example, same name, comment on
F-FB/F-FC).
Do not save the backup copy in the project containing the protected F-FB/F-FC
(otherwise an unprotected copy of the F-FB/F-FC is available).
If you want to save the backup copy in a library, make sure that it is a user-created
F-library in S7 Distributed Safety (see Section 1.2.14). The FBD/LAD Editor
displays only F libraries for S7 Distributed Safety.
5. Save the backup copy of the F-FB/F-FC.
Result: The check box in the "Know-how protection" column of the "Safety
Program" dialog is activated and can no longer be selected.
The block icon in the "Block" column has a padlock. The F-FB or F-FC is
protected.
6. Follow the same procedure until all the F-FBs/F-FCs you want to protect are
protected.
Modifying Protected F-FBs/F-FCs
Note
You cannot cancel the know-how protection of F-FBs/F-FCs.
If you want to modify a protected F-FB/F-FC, follow the steps below:
1. Delete the protected F-FB/F-FC from your project.
2. Copy the backup copy of the F-FB/F-FC into your project.
3. Edit the unprotected F-FB/F-FC in the FBD/LAD Editor.
4. If required, set the know-how protection for the F-FB/F-FC (see above).
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Product Information for the S7 Distributed Safety, Configuring and Programming Manual
A5E00169432-02