The Beckhoff BK9103 PROFINET Bus Coupler links PROFINET RT controllers to the proven Beckhoff K-bus I/O system, enabling modular, cabinet-friendly expansions for machines and process equipment. With an integrated two-port switch and compact housing, it streamlines panel layouts and supports flexible line or star network architectures in demanding industrial environments.

Designed for real-time performance, the BK9103 supports PROFINET RT Class B with auto-negotiating 10/100 Mbit/s over 2 x RJ45, handling up to 512 bytes input and 512 bytes output cyclic process data. It accommodates up to 64 Bus Terminals out of the box (255 with K-bus extension), offers 24 V DC supply with robust 500 V isolation, and maintains reliable operation from -25 to +60°C. Configuration via KS2000, IP20 protection, EMC compliance, and 100 m segment lengths between nodes simplify engineering and commissioning.

Whether upgrading existing lines or building scalable OEM platforms, this coupler delivers predictable performance, fast installation, and long-term availability, backed by Beckhoff’s global support and a 1-year warranty to safeguard your investment.

• Brand: Beckhoff
• Series: BKxxxx Bus Coupler
• Model: BK9103
• Protocol: PROFINET RT (Class B)
• Bus interface: 2 x RJ45 with integrated 2-port switch
• Data rate: 10/100 Mbit/s auto-negotiation
• Supply voltage: 24 V DC (-15%/+20%)
• Protection rating: IP20