INTERBUS is a standardized, open bus system acc.to IEC61158 which is basically set up as a ring topology. All nodes are actively integrated in the closed transmission path. This bus system differs from other systems in as much as the feed and the return line within one transmission medium is routed through all nodes. The last node automatically closes the ring. From the perspective of physical appreance a line topology is created.

Bus access is based on the master/slave mode, in which data are sent from the master to the first node and then shifted sequentially from one node to the other. Due to its active coupling, each node functions as a repeater, which re-generates the signal.