Inverse dynamics - Simulink - Crank slider

Hello,

I want to analize a crank slider mechanism using as input the displacement of the slider. I do it this way:

The problem is that the mechanism doesnt reach the singular position at all, so it goes and returns from the same side. I think this is the reason (17 cm is maximum displacement and the same happens with the minimum displacement, 7 cm).

Could someone tell me how to solve it?

I attached the file.

Thank you.