It is possible to repeat the user interface of the panel e.g. if there are more exit doors in the building and on each exit door the visibility of the fire system is required.
In case you need to spread the load of the system, or if you have more buildings on one site that need to get connected together in one system or in case a specification requires e.g. that on each floor of the building a panel is installed that controls it’s own floor a ring network can be created.
Also if an existing system needs to be expanded you can either go for the loop expansion board if only 1 or 2 loops are required locally or you go for the most complete solution by connecting another panel in the network. The choice is yours.