Ethernet topologies
BK9000, BK9050, BC9000, BC9020, BC9050
These Bus Couplers and Bus Terminal controllers have a single Ethernet connection. This can be connected directly to an external switch. This makes it possible to construct the typical Ethernet star topology.

BK9100, BC9100, BC9120, BC9191
These Bus Couplers and Bus Terminal controllers have an internal triple switch with one internal and two external ports. The internal switch enables the simple construction of a linear topology. A maximum of 20 BK9100/BC91x0/BC9191 can be connected in series in a physical line. However the distance between two Ethernet devices may not exceed 100 m. The maximum overall line length is therefore 2 km. No further switches may be included in this line.

Of course, the construction of a classic star topology is also possible with these Bus Couplers and Bus Terminal controllers.