If you’re with S7 F Systems V6.4:
: Starting with V6.4, the "Safety Data Write" functionality is no longer supported; users are recommended to migrate to the "Secure Write Command" (SWC) Documentation and Manuals S7 F Systems V6.4 Download--
. You must migrate to the "Secure Write Command++" (SWC) functionality for safety-related modifications from an operator station. Increased Security: If you’re with S7 F Systems V6
Updated encryption and protection for safety-related communication (Safety over Profibus/Profinet). S7 F Systems V6.4 Download--