Hello Hari;

As a first step, have a look at this Application file from Siemens:

AS-AS Communication between process control system PCS 7 and Freelance 800F by ABB

The application exampleis based on PCS 7, and is not designed for redundant communications, as it isnow. But it will give you an idea of the possibilities, and if you want to use it as a basis for your design we might be able tocontribute hints and informationwith the follosing steps.

Hope this helps,

Daniel Chartier