How to get catenary in Simulink

Hello!

I'm learning simulink, and for my task I need to get Catenary line from solid blocks. I made seuqunce of blocks and put between them spherical joints, but they are staying in one line and nothing happense (look at the picture). I don't understand what in need to do that makes it banded.

[Alexey Kozhakin]

Put picture here, sorry I attached picture not rigth in the question