Beckhoff Automation GmbH BK2020 LightBus Coupler

The Beckhoff BK2020 LightBus Coupler (Economy Plus) supports up to 1020 digital signals and 128 analog I/O channels per slave in full expansion, making it a robust gateway between Beckhoff Lightbus and the Beckhoff System Bus Terminals. As a BK20x0 family member, it provides 500 V isolation on the power contacts, enabling safe operation in mixed-voltage automation environments. Between stations, fiber distances vary by cable type: up to 45 m with APF fiber and up to 300 m with HCS fiber, supporting flexible topologies in installations with varying lengths. The unit weighs approximately 150 g and is rated for 0 to +55 °C operation (with storage from -25 to +85 °C). Designed for use where a reliable Lightbus link to a central controller is required, it integrates with Beckhoff Bus Terminals to extend I/O across distributed nodes in automation projects.