BK1250 Beckhoff
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The Beckhoff BK1250 is part of the BK EtherCAT Bus Couplers series and supports a total of 256 analog I/O signals and 8192 digital I/O signals. This bus coupler includes 64 bus terminals and uses E-bus contacts for its bus interface. It features a polycarbonate housing, is designed for 35 mm DIN rail mounting, and offers an IP20 protection rating.
Internal Product Review
The BK1250 is a Beckhoff EtherCAT bus coupler that delivers high-speed communication at 100 Mbit/s. Support for 64 bus terminals and 8192 digital signals gives the coupler excellent scalability in dense I/O architectures. IP20 protection and 500 V isolation add dependable panel performance, making BK1250 a strong choice for EtherCAT control cabinets.
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Product Description:
The BK1250 is a bus coupler manufactured by Beckhoff within the BK EtherCAT Bus Couplers series. It links EtherCAT fieldbus segments to modular I/O terminals so that PLCs or IPCs can exchange process data with distributed sensors and actuators. In an automation cabinet, it sits beside standard KL or EL terminals and forwards power and communication through internal contacts. This arrangement lets one terminal station combine multiple signal types in a compact node without requiring a separate gateway between the controller and the terminal stack.
This coupler transmits process data across the network at 100 Mbit/s, a rate used by the EtherCAT protocol on its E-bus contacts. On the terminal side, it supports up to 8192 I/O for digital points and accepts as many as 64 bus terminals before another coupler is needed. The analog section accommodates 256 channels, so digital and analog terminals can remain in the same station when a machine uses both switching signals and measured values. Device electronics draw a maximum of 200 mA from the upstream auxiliary supply, while the internal K-bus can source up to 500 mA for attached terminals. A spring-actuated wiring method simplifies conductor insertion, and the polycarbonate housing snaps onto a 35 mm DIN rail to keep the assembly orderly inside the control enclosure.
Power forwarding is handled by contacts rated for 10 A, so downstream terminals can share the same distribution path inside the station. These contacts are limited to 24 V DC to match common control voltage practice, and signal and power circuits are isolated by up to 500 V to reduce interference between field and logic domains. The enclosure carries an IP20 rating, which provides finger-safe openings but still requires cabinet mounting where dust or moisture may be present. The electrical separation and compact terminal format suit installations that need dense I/O assembly while keeping network communication and field-side power organized in one location.
