The Sheet Input and Sheet Output nodes are used to create generic logic functions that can be reused across multiple KNX projects. They replace actual KNX inputs and outputs, allowing you to save internal logic as an independent “module”.

Let’s say we want to create a function that adds two values, A and B.

1. Add two Sheet Input nodes to represent the values A and B.
2. Connect both to an Add block to perform the sum.
3. The result is connected to a Sheet Output node (A + B).
4. Give meaningful names to inputs and outputs (e.g., “Input 1 - A”, “Input 2 - B”, “Output - A+B”).
5. Save and export the logic as an `.xml` file.

1. In the main project, use a Logic Module Sheet node and import the `.xml` file created earlier.
2. Connect real KNX Inputs to the module inputs (A and B).
3. Connect the Sheet Output (A+B) to a real KNX Output.

This way, you can reuse and standardize logic blocks across different installations, saving time and ensuring consistency.