The default OpenModelica library have some I/O ports. The route is the following: Modelica>Blocks>Interfaces
There you can see, for example, 'RealInput' and 'RealOutput'.

How can I generate a line that goes from 0 to 1 by the time of an input? The input value represents the time the system needs to reach 1 and it changes each cycle. Thank you very much.

I've been trying with look-up table or repeating sequence but I can't find the solution.