Overview The Beckhoff BK9053 is a compact PROFINET RT (Class B) Bus Coupler that links PROFINET networks to modular Beckhoff Bus Terminals. It automatically recognizes connected terminals and maps them to the process image. The unit supports auto‑negotiation 10/100 Mbit/s via an RJ45 interface and connects up to 64 Bus Terminals (255 with K‑bus extension). Key Features PROFINET RT (Class B) with GSDML integration Auto 10/100 Mbit/s over 1 × RJ45 Process image up to 512 bytes input and 512 bytes output Supports 64 Bus Terminals (255 with K‑bus extension) 24 V DC supply; K‑bus current 1,750 mA 500 V isolation between power contacts, supply voltage, and fieldbus Specifications Model BK9053 PROFINET Compact Bus Coupler Protocol PROFINET RT (Class B) Bus Interface 1 × RJ45 Data Rates 10/100 Mbit/s, automatic recognition Max Process Image 512 bytes input / 512 bytes output Supported Bus Terminals 64 (255 with K‑bus extension) Power Supply 24 V DC (−15%/+20%); input current 70 mA + (Σ K‑bus current)/4, max 500 mA K‑bus Current Supply 1,750 mA Power Contacts Max. 24 V DC / 10 A Electrical Isolation 500 V (power contact/supply voltage/fieldbus) Topology / Distance Star; 100 m between switch and coupler Dimensions (W × H × D) 44 × 100 × 68 mm
