Romain,
Yes. What you do is you create the block you need (maybe by using the assert() keyword in Modelica), and then use that block in this type of construct:
Needs["WSMLink`"]
WSMConnectComponents["newmodel",{"c1"\[Element]"RealExpression","c2"\[Element]"RealOutput"},{"c1.y"->"c2"}];
WSMSetValues["newmodel",{"c1.y"->RandomReal[]}]
Now you can change the input to be different random real for each model. You can use WSMConnectComponents with any components, here I'm using the Modelica.Blocks.Sources.RealExpression and Modelica.Blocks.Interfaces.RealOutput, but can be anything you like. You can use all the Wolfram Language symbols to generate a large set of these models, just wrap the two commands here with Table, For or any such construct.
