Beckhoff BK9103 – Overview The Beckhoff BK9103 is a PROFINET RT bus coupler designed to connect the modular Beckhoff Bus Terminal system to a PROFINET network. It supports up to 64 connected bus terminals and can be expanded up to 255 when using the K-bus extension. The device offers 10 Mbit/s and 100 Mbit/s Ethernet speeds and features a built-in two-port RJ45 switch for flexible line or star topologies. This coupler simplifies I/O station wiring and automates terminal recognition and process image mapping, making it ideal for industrial automation systems requiring modular, high-performance infrastructure. Key Features Supports PROFINET RT protocol Class B Gigabit Ethernet compatibility: 10/100 Mbit/s automatic recognition Two RJ45 ports provide integrated Ethernet switch for line topology Supports up to 64 bus terminals standard; 255 with K-bus extension 512 bytes input / 512 bytes output process image capacity 24 V DC power supply (-15% / +20%) Automated I/O mapping of connected bus terminals Line topology support: up to 20 devices cascaded, max 2 km length Electrical isolation: 500 V (power contacts / supply / fieldbus) IP20 protection rating, 35 mm DIN-rail mountable Technical Specifications Part Numbers:– BK9103– BK 9103 Protocol: PROFINET RT (Class B) Data Transfer Rate: 10/100 Mbit/s (automatic recognition) Bus Interface: 2 × RJ45 ports, integrated switch Max Bus Terminals: 64 standard, 255 with K-bus extension Max Process Data: 512 bytes input / 512 bytes output Power Supply: 24 V DC (-15% / +20%) Current Consumption: 70 mA + (K-bus current)/4, max 500 mA K-bus Power Supply Capacity: up to 1750 mA Topology Support: Line or star wiring, up to 20 devices cascaded, max 2 km line length Max Distance Between Stations: 100 m Electrical Isolation (Dielectric Strength): 500 V Operating Temperature: -25 °C … +60 °C Storage Temperature: -40 °C … +85 °C Weight: Approx. 170 g Dimensions (W × H × D): 51 mm × 100 mm × 69 mm Mounting: 35 mm DIN-rail Protection Rating: IP20 Manufacturer: Beckhoff Automation Weight: 0.10 – 0.23 kg (0.22 – 0.50 lb)Packed dimensions: 12 × 7 × 6 cm (4.7 × 2.8 × 2.4 in) Applications Modular I/O systems requiring PROFINET RT connectivity Machine control panels with distributed bus terminals Industrial plants with flexible station topology (line or star) Automation setups where up to 64 (or expanded 255) terminals are needed Why Choose Beckhoff BK9103 Enables seamless PROFINET integration for Beckhoff bus terminal systems High flexibility in topology and scalability for large I/O counts Built-in line topology support reduces wiring complexity and cost Compact, industrial-grade design with global certifications Order Now The Beckhoff BK9103 PROFINET Bus Coupler is available for order and ships worldwide.
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