The Beckhoff CU1128 EtherCAT Junction is a versatile and high-performance infrastructure component designed to expand EtherCAT networks. With eight independent RJ45 ports, the CU1128 enables flexible topologies such as star, tree, and mixed architectures, making it an ideal choice for modular and decentralised machine design.

As an EtherCAT junction, the CU1128 performs the role of branching communication lines while maintaining EtherCAT’s hallmark features of high speed and deterministic performance. Each of its eight ports supports standard 100BASE-TX Ethernet communication at 100 Mbit/s, with cable lengths of up to 100 metres using shielded Cat.5 or higher cabling. This provides engineers with ample flexibility in designing layouts across machines, plants, or buildings.

The CU1128 introduces only ~1 µs delay per port, ensuring real-time EtherCAT communication is preserved even in large and complex networks. This low latency allows the junction to support time-critical applications such as motion control, synchronised process automation, and high-speed data acquisition without sacrificing system responsiveness.

Designed for industrial reliability, the CU1128 is powered by a 24 V DC supply and built to withstand demanding environments. Its use of shielded Ethernet cabling ensures high immunity against electromagnetic interference, making it suitable for installation in electrically noisy conditions often found in industrial plants.

The CU1128 is particularly useful in situations where EtherCAT networks must be distributed across multiple machine modules, production lines, or remote stations. By providing up to eight EtherCAT branches, it simplifies cabling, reduces the need for long daisy-chains, and allows parallel connection of devices. This not only improves system scalability but also enhances modularity, as machine sections can be designed, tested, and installed independently.

As part of Beckhoff’s EtherCAT infrastructure family, the CU1128 integrates seamlessly into existing systems without requiring configuration or additional software. Its plug-and-play functionality makes installation straightforward, while built-in diagnostics via EtherCAT monitoring tools allow engineers to quickly assess the status of each branch for commissioning and maintenance.

Typical applications include machine tools, packaging machinery, robotics, process automation, and building services, where large numbers of EtherCAT devices must be connected efficiently. By offering a centralised junction point, the CU1128 supports highly flexible and space-saving layouts, reducing engineering complexity while maintaining EtherCAT’s proven high-performance communication.

In summary, the Beckhoff CU1128 EtherCAT Junction is a powerful and flexible network expansion module. With eight RJ45 ports, 100 Mbit/s transfer rates, low-latency switching, and robust 24 V DC operation, it provides engineers with an indispensable tool for designing scalable, modular, and reliable EtherCAT networks across modern automation systems.