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In classic Siemens SIMATIC Manager (Step 7 v5.x) , developers often apply a flag called KNOW_HOW_PROTECT to Organization Blocks (OBs), Function Blocks (FBs), and Functions (FCs). When enabled, this flag hides the underlying Statement List (STL), Ladder Logic (LAD), or Function Block Diagram (FBD) code. It prevents unauthorized modification or viewing of proprietary algorithms. simatic s7 can opener v131 activation link