Beckhoff BK9105 original Bus Terminal System

The Beckhoff BK9100 is an Ethernet TCP/IP Bus Coupler that connects Beckhoff's modular Bus Terminal system (KLxxxx series) to an Ethernet network. Its defining feature is the dual RJ45 ports operating as a 2-channel switch, enabling I/O stations to be wired in a line topology instead of the classic star topology—significantly reducing cabling effort and cost. It supports up to 64 Bus Terminals directly and communicates via TwinCAT ADS and Modbus TCP.