Siemens SIMATIC PCS 7 Operating Manual page 125

Procedure
To download the safety program, select the menu command "CPU > Download > Entire
program" in the CFC editor. This will set the F CPU to STOP.
To download changes made to the safety program, select the menu command "CPU >
Download > Changes" in the CFC editor. Depending on the CFC editor version you are
working with, you may need to deactivate safety mode in the SIMATIC Manager before this
process takes place and reactivate it afterwards. Alternatively, a prompt may be issued in
CFC offering you the option of deactivating safety mode directly and reactivating it after
downloading has taken place.
Note
Before the safety program is downloaded you will be prompted to enter the CPU password if
changes are detected in the fail-safe part of the program.
Once you have downloaded the program to the CPU, you will need to compare this
program's collective signature with the collective signature in the acceptance-tested printout.
On S7 F/FH systems, you need to run this comparison for both CPUs.
See also
Tracking changes in the safety program (Page 178)
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
Configuring the safety program
7.9 Safety mode and downloading the safety program
125