Navigating to charts and adding own logic to override an existing output

Navigate to charts of application functions or room unit

In Project navigation view, double-click an application function or room unit within the room folder %R% or room segment folder %RSegm%.

The chart of the selected application function or room unit is displayed in Programming editor.

To override an existing output, you can directly navigate to the chart of the function block of the input or output:

In Project navigation view, click the room segment folder %RSegm%.
Right-click the input or output you want to override with your own application function and select Show in program from the context menu.
The chart of the respective function block is displayed in Programming editor.
Select the function block.
In Properties tab, navigate to Interface section.
You can see which inputs and outputs are not shown in the interface indicated by the individual Invisible checkbox settings.
To enable the visibility, clear the Invisible checkbox of the inputs and outputs you want to override.
Inputs or outputs are displayed in the according function block in Programming editor.
Go to Library, select a function or instruction block and drag onto the Programming editor.