Simatic S7 Distributed Safety V5.4 SP5 Update 2 is not a fully "free" software; it is a paid safety option package for Siemens STEP 7 (Classic) that requires a valid license for permanent use . However, it is available as a 14-day free trial
: While service packs and updates (like SP5 and Update 2) are often free to download for existing license holders, the base license (V5.4) Simatic S7 Distributed Safety V5.4 Sp5 Update 2 -FREE-
: Provides the F-library for creating safety-related programs for S7-300F/400F and WinAC F controllers. Installation Steps Simatic S7 Distributed Safety V5