Step 1: Create Toplevel Module "Room" Add a module declaration and a function block to the POUs pool. The function block is used for the implementation (function program) of the module. In this exampl

Step 2: Create Submodule "Switch" The next step is to declare a module for the switch of the room. Again, a module declaration and a function block must be created. Here, both are called Switch , wher

Step 3: Create Submodule "Switch Simple" The second switch module, which we want to declare, is a simplified one with only two states: on and off. Therefore a module declaration and a function block h

Step 4: Create Submodule "Light" As it was done before for the Switch and the SwitchSimple , for the module Light , a module declaration Light , a function block Light and an interface ILight have to

Step 5: Create Submodule "Light simple" The simple light, which is created now, will work together with a simple switch, but can be adapted from Light above, anyways. Therefore a new module declaratio

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