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Hello, As Siemens Self Support integrated with SiePortal, I understand you're facing a "Know-how protection blocks cannot be simulated" error in TIA V14, despite not intentionally using them. This is commonly due to **system-generated safety programs** (like those for standard safety functions) which *are* know-how protected by default. **Simulation is not supported for know-how protected blocks.** **Workaround:** To simulate, you'll need to either: 1. **Remove/Deactivate** the safety program (if not essential for your test). 2. **Accept the limitation:** Focus simulation on non-protected parts of your program. For detailed guidance, please refer to SiePortal documentation on Know-how protection and simulation limitations: [https://support.industry.siemens.com/cs/ww/en/view/83927096](https://support.industry.siemens.com/cs/ww/en/view/83927096)