For SIMATIC STEP 7 V5.6 (Classic), the compatible version for safety programming is S7 Distributed Safety V5.4 SP5 Update 2. There is no "V5.6" standalone version of the S7 Distributed Safety package itself; the versioning usually refers to the base STEP 7 software it integrates with. Official Download Options
System Requirements:
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F-Programming: You will create a "Safety Program" folder within your block folder. Programming is done in F-FBD or F-LAD. s7 distributed safety programming v5.6 download
*.dll files during installation.