Siemens SIMATIC S7 F Manual page 182

Safety
F-I/Os that are supposed to have the same safety-relevant module parameters can
be copied during configuration. Their safety-relevant module parameters no longer
have to be checked individually: It is enough to compare the 'Parameter CRC
(without address)' of the copied F-I/Os with the 'Parameter CRC (without address)'
of the already checked F-I/Os and to check the logical start addresses.
Saving the Program
The Safety Program to be accepted must be saved and archived with the whole
STEP 7 project. All the project data (program information, CFC charts, hardware
configuration data and logs) must be printed out and archived together with the
STEP 7 project. You can find out how to save and archive S7 projects in the basic
STEP 7 help system.
Checking the Printout
Print out the whole project as described in the section entitled Printing the Safety
Program.
The printout contains the overall signature as a reference. The overall signature
appears twice in the printout, once in the program information section as the value
of the block container and once in the footer as a value from the source. The
values must match up.
The version number of the S7 F Systems optional package appears in the footer of
the printout and must be checked.
If the overall signature is not printed in the footer, this means that the Safety
Program or the configuration (HWCONFIG or NetPro) has changed. In this case
the Safety Program has to be recompiled.
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Fail-Safe Systems
A5E00085588-03