Compact bus coupler for star wiring topologies, EtherNet/IP connectivity

Beckhoff Automation's BK9055 Compact Bus Coupler offers EtherNet/IP connectivity options when used with the Bus Terminal system.


Beckhoff Automation has announced the BK9055 Compact Bus Coupler. The BK9055 couples EtherNet/IP with the modular Bus Terminal system from Beckhoff, which reportedly offers over 400 different signal types. The Compact Bus Coupler series is characterized by slim housings and cost-optimized design.

The BK9055 Compact Bus Coupler facilitates the connection of the Beckhoff I/O system to EtherNet/IP networks. When used alone, it is suitable for star wiring topologies.

The BK9055 is software-compatible to the BK9105 EtherNet/IP Bus Coupler from Beckhoff, which unlike the "Compact" version has a second RJ 45 port (2-channel switch), according to Beckhoff. Therefore, the I/O stations can also be configured with a line topology, instead of the classic star topology.

Beckhoff Automation

- Edited by Amanda McLeman, Control Engineering,

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