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Beckhoff BK9050
Product Name
Beckhoff BK9050 Ethernet TCP/IP compact bus coupler for Bus Terminal I/O systems.
Product Overview
The coupler connects Ethernet networks with Beckhoff modular Bus Terminals. It automatically recognizes connected terminals, maps process data and supports industrial communication protocols for distributed I/O in machine and plant automation.
Detailed content
Technical Specifications
Bus Terminal capacity: 64 terminals, up to 255 terminals with K-bus extension.
Process image: 512 bytes input and 512 bytes output maximum.
Digital peripheral signals: up to 1020 inputs or outputs.
Analog peripheral signals: up to 128 inputs or outputs.
Protocols: TwinCAT ADS, Modbus TCP and Beckhoff real-time Ethernet.
Transmission rate: 10/100 Mbit/s automatic negotiation.
Bus interface: one RJ45 port.
Media: four-pair twisted copper, Cat 3 for 10 Mbit/s, Cat 5 for 100 Mbit/s.
Topology: star wiring through hub or switch.
Station distance: up to 100 m between switch and coupler.
Supply: 24 V DC with −15 percent to +20 percent tolerance.
Input current: 70 mA plus total K-bus current divided by four, maximum 500 mA.
Inrush current: 2.5 times continuous current.
Recommended fuse: 10 A maximum.
K-bus supply: 1750 mA.
Power contact rating: 24 V DC maximum, 10 A maximum.
Galvanic isolation: 500 V between power contacts, supply and fieldbus.
Weight: approximately 100 g.
Operating temperature: 0 to 55°C.
Storage temperature: −25 to 85°C.
Humidity: 95 percent relative, non-condensing.
Protection: IP20.
Housing material: polycarbonate.
Dimensions: 44×100×68 mm.
Functional Features
Automatic terminal recognition and process-image assignment.
DIP-switch IP configuration with DHCP support on compatible networks.
KS2000 configuration utility for addressing, protocol and diagnostic settings.
LED status indicators for power, fieldbus and I/O activity.
Compact design for high-density control cabinets.
Application Scenarios
Machine I/O distributed over Ethernet TCP/IP.
Factory automation, process skids and building or infrastructure control.
Retrofit of existing Bus Terminal systems to Ethernet communication.
Performance Parameters
Channel count and data update rate depend on terminal mix, protocol and controller scan cycle.
Modbus TCP provides open master/slave access; ADS provides TwinCAT system communication.
Real-time performance depends on network loading, switch quality and coupler configuration.
Material Composition
Housing uses polycarbonate with self-extinguishing industrial grade.
Contacts use tin-plated copper alloy.
Spring terminals use nickel-plated steel and copper elements.
Structural Characteristics
Compact terminal-style housing for 35 mm DIN rail.
RJ45 fieldbus port on the lower section and Bus Terminal connection on the upper section.
Side double-slot and key connection for adjacent terminal mounting.
Labeling window compatible with Beckhoff BZ identification accessories.
Working Principle
The coupler receives Ethernet telegrams from the controller.
It converts protocol data into K-bus or Bus Terminal process images.
Connected terminals exchange digital and analog signals with the coupler.
The coupler returns input status and diagnostic information to the controller.
Installation Requirements
Mount on 35 mm DIN rail according to EN 60715 with locking foot.
Wire solid conductors 0.08 to 2.5 mm², flexible conductors 0.08 to 2.5 mm², ferrules 0.14 to 1.5 mm².
Strip 8 to 9 mm conductor length.
Connect Ethernet with Cat 5 cable for 100 Mbit/s and keep station distance within 100 m.
Install upstream fuse not exceeding 10 A.
Usage Precautions
Operate only in IP20 enclosures with ambient temperature 0 to 55°C.
Prevent condensation, dust accumulation and mechanical stress on RJ45 ports.
For Ex applications, follow the certified Ec IIC T4 Gc Zone 2 installation rules.
Do not exceed K-bus current budget when adding terminals.
Verify IP settings before network commissioning to avoid address conflicts.
