CU1123 Beckhoff
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The Beckhoff CU1123 is part of the CU EtherCAT Junctions series and features three RJ45 bus interfaces with a typical current consumption of 100 mA. It supports a data transfer rate of 100 Mbit/s using Ethernet Cat 5 cabling and operates on a 24 VDC supply voltage. This junction offers variable installation positions, supports hot connect and distributed clocks, and mounts on a 35 mm rail with IP20 protection.
Internal Product Review
The CU1123 is a Beckhoff EtherCAT junction for coupling EtherCAT junctions, with 3 x RJ45 bus interfaces for straightforward branch connections. Distributed clocks and hot connect support add strong value in synchronized, modular machine networks. A very capable junction for EtherCAT expansion where clean topology management matters.
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Product Description:
The CU1123 is an industrial communication junction produced by Beckhoff within the CU EtherCAT Junctions series. This DIN-rail module segments and branches high-speed fieldbus lines so multiple machine subassemblies can be connected and disconnected quickly during maintenance or service. By providing a central coupling point, the part simplifies field distribution of real-time I/O traffic in factory automation cells and packaging lines. It is used where orderly network layout and fast branch access are needed inside compact control cabinets.
The unit offers a bus interface consisting of 3 x RJ45 sockets, with one reserved as the upstream X1 input and two used for downstream branches. Each port propagates frames at a deterministic 100 Mbit/s data rate over shielded Cat-5 cabling, and packets remain synchronized through the integrated distributed-clock mechanism. Hot Connect capability lets an entire branch be connected or removed while the remaining network continues exchanging process data. The junction couples EtherCAT branches, so segment lengths can reach up to 100 m between active devices without repeaters. All circuitry is powered from a single 24 VDC logic rail that is wired on the three-pole spring terminal. Communication follows the EtherCAT protocol and relies on full-duplex Ethernet transmission, so media conversion is not required.
Hardware integration is simplified by a typical control-cabinet load of 100 mA, which minimizes demand on 24-volt power supplies. The enclosure clips directly onto a 35 mm Rail (EN 60715), and the installation position is variable, allowing horizontal or vertical orientation in tight panels. The housing has an IP20 protection level, so the device must be installed inside a protected enclosure, yet it tolerates relative humidity up to 95% without condensation. This mounting style helps the module fit beside PLC slices, network couplers, and other DIN-rail devices without requiring a separate mounting plate.
