BK2000 by Beckhoff

The BK2000 is a bus coupler manufactured by Beckhoff for the BK Bus Couplers series. It links a block of Beckhoff K-bus terminals to a higher-level automation network and translates terminal data into fieldbus frames. The device also supplies operating power to the attached I/O stations, supporting compact remote I/O installations that can be expanded as machine requirements change.

The coupler communicates over the Lightbus protocol at a data transfer rate of 2.5 Mbit/s, providing the cyclic throughput used for communication with the controller. Its internal supply rail accepts 24 VDC and energizes the coupler electronics and downstream terminals without an auxiliary supply. Up to 64 standard bus terminals can be connected directly to the coupler. Capacity can be expanded to 255 channels when a K-bus extension module is installed, allowing a single node to accommodate additional sensors, actuators, and special-function terminals. The fieldbus interface and K-bus operate independently, so fieldbus communication and terminal data exchange can be processed without interfering with each other. The enclosure is intended for installation in a control cabinet that provides suitable protection from water, debris, and unintended contact.

The coupler snaps onto a 35 mm rail compliant with EN 60715, permitting straightforward installation and removal when panel layouts change. Its variable installation position allows the unit to be mounted horizontally or vertically without disrupting convection cooling. The housing has an IP20 protection rating, shielding live parts from accidental finger contact while allowing air to circulate around the enclosure. Storage and transportation are permitted within a temperature range of -25 °C to +85 °C, allowing the device to remain in unconditioned storage areas when it is not operating. Adequate spacing around the housing helps preserve airflow and provides access to the terminals and network connections during installation.