BC9191-0000

The Beckhoff BC9191-0000 bus terminal from the BC Bus Terminals series is a universal Ethernet-based bus coupler designed for industrial and building automation applications. It features 2 x RJ45 (switched) Ethernet interfaces for high-speed network connectivity and daisy chaining, and supports up to 64 bus terminals via the integrated K-bus. The device is fully programmable with TwinCAT ADS and supports Modbus TCP, enabling seamless integration into Beckhoff automation environments. With a nominal supply voltage of 230 V AC and a protection rating of IP20 in a vertical installation position, the BC9191-0000 ensures reliable operation in standard control cabinets. The unit delivers a K-bus current of 200 mA to downstream terminals, supporting extensive I/O configurations.

The BC9191-0000 is equipped with 3 contacts digital inputs and 3 x 0–10 V analog inputs suitable for a wide range of sensors. It provides 2 x 0–10 V analog outputs for driving actuators or control loops, and the digital outputs are offered as relay/triac types with indicator LED status for clear on-board diagnostics. Temperature measurement is supported via dedicated Pt/ni1000 inputs covering a range of –20…+60 °C with a resistance measurement range of 0–10 kΩ. The device accommodates data traffic with a fieldbus input size of 512 bytes and output size of 512 bytes, ensuring sufficient throughput for complex automation tasks. Its physical dimensions—118 mm width (127 mm including cover), 100 mm height, and 70 mm depth—provide a compact footprint for dense rack installations.

Operational performance is enhanced by the switched Ethernet ports, which allow hot-swapping and flexible network topologies without interrupting fieldbus communications. The RS485 sub-bus interface enables twisted-pair connectivity for legacy or remote I/O extension, further increasing system versatility. The unit’s high fieldbus byte capacity (512 bytes in and out) supports large data sets and complex control schemes without compromising cycle times. A standardized IP20 enclosure in a vertical orientation simplifies panel installations and maintains required air flow for heat dissipation. The BC9191-0000’s robust design ensures uninterrupted data handling and deterministic behavior under typical industrial environmental conditions.

System integration is streamlined through native support for TwinCAT ADS and Modbus TCP protocols, allowing immediate deployment in Beckhoff automation projects and mixed-vendor networks. The flexible I/O configuration—featuring digital, analog, and temperature channels—caters to applications such as machine control, building management systems, and process automation. The unit’s compact dimensions and DIN-rail mountability facilitate rapid integration into existing control cabinets. This combination of high channel density, versatile communication interfaces, and proven Beckhoff reliability makes the BC9191-0000 ideal for demanding industrial automation and building services installations.