This is the . You do not need a paid service contract to download the base software, but you do need a free Siemens account.
Download files
: Allows standard and safety-oriented programs to run on the same CPU, using standard STEP 7 languages like LAD (Ladder) and FBD (Function Block Diagram). csl-connect.nz Download and Trial Information 14-Day Trial : A trial version of Update 2 for S7 Distributed Safety is available for testing. Export Restrictions