Animate cable track

[slate moss]

Hello everybody,
I have a case need your help.
I want to animate cable chain so the purpose is the top part moving along X axis and the bend radius is constant.
I watch the youtube video but don't know how to control it. Please help me

https://www.youtube.com/watch?v=0PfK9tyobpo

[vestal terrace]

Hi, I looked in it and made an example Blend file for you... there is an object with a curve modifier to a curve with than is moved... for more detail look in the blend file

[slate moss]

Dear Bend3d, really appreciate your help, best wish for you. Many thanks!!!!!!!!!!!!