Modelica.Blocks.Interfaces.RealInput

[Schubert TUD]

Hi,

I tried to use Modelica.Blocks.Interfaces.RealInput in my model. Unfortunately, the simulation failed because of too few equations. Below there is an example illustrating the problem. (The firstOrder Block does not have any infkuence on the error.) It seems that Modelica.Blocks.Interfaces.RealInput is defined in an unusual way, which confuses OpenModelica. If you look at the flattened code using 'instantiateModel', it emerges that the omc flattens 'RealInput u' to 'Real u' instead of 'input Real u'. I also cross-checked with Dymola and it worked fine.

Regards,

Christian Schubert

---

works, 2 equations and 2 variables
model RealInputOK
  input Real u;
 

Modelica.Blocks.Continuous.FirstOrder firstOrder;

equation

  connect(u, firstOrder.u);

end RealInputOK;

fails, 3 equations and 2 variables
connector RealInput = input Real; from Modelica.Blocks.Interfaces.RealInput
model RealInputFail

  RealInput u;

  Modelica.Blocks.Continuous.FirstOrder firstOrder;

equation

  connect(u.x, firstOrder.u);

end RealInputFail;

[Martin Sjölund]

I'll assume there was a typo and it was supposed to be connect(u, ...) and not u.x, which does not exist.
Anyway, it works in the trunk.