Use constraints with multiple modules

Hi all,

I am working on a problem where I use several different modules, and I want to add another constraints to the model. Say in my model component 1 I want to solve for u(t), d(t) and phi(t), each with one module. Now I want to use one equation (ux*phix+uy*phiy)*step1(d-dm)=0 as a constraint that is to be satisfied globally, how should I implement it? I tried adding "Global constraint" but it seems not working. Any help is appreciated.

Jiangzhi