One of the most important characteristics of Ethernet – and therefore POWERLINK – is that users are completely free to choose any type of network topology whatsoever. Star, tree, daisy chain or ring structures – any combination of these topologies is possible on a network without configuration. There is also no binding interdependence between logical links in the application and the physical layout. Changes to the network, including modifications made on the fly, can be implemented at any time and in any way without compromising the application.