CU1124 Beckhoff
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The Beckhoff CU1124 is part of the CU EtherCAT Junctions series and features a 4 x RJ45 bus interface with a data transfer rate of 100 Mbit/s. It supports EtherCAT protocol, Distributed Clocks, and Hot Connect, and can be mounted on a 35 mm DIN rail. The device has an IP20 protection class, uses 24 VDC supply voltage, and allows a maximum station distance of 100 meters.
Internal Product Review
The CU1124 is a Beckhoff EtherCAT junction built for efficient network expansion with 4 x RJ45 connections and a 100 Mbit/s data transfer rate. Support for Distributed Clocks and Hot Connect adds strong synchronization performance and simplifies integration in fast-moving automation systems. IP20 protection makes this unit a dependable choice for control cabinet EtherCAT applications.
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Product Description:
The CU1124 is an EtherCAT junction module manufactured by Beckhoff for the CU EtherCAT Junctions series. Acting as a branching node, it enables star or tree wiring so that a single EtherCAT trunk can feed four subordinate segments serving distributed I/O, drives, or measurement stations. Mounted inside a control cabinet, the unit supports deterministic protocol timing and distributed clock functionality, making it suitable for precise motion control or data acquisition across multiple machine sections.
Network connections are provided through four RJ45 sockets, and the switch-free design forwards frames at 100 Mbit/s without introducing switching latency. Logic electronics and status indicators draw power from a 24 VDC control supply connected through the three-pole spring terminal. A clip for a 35 mm DIN rail supports installation alongside other automation terminals in the control cabinet. The enclosure has an IP20 protection rating, providing protection against contact with hazardous internal components while relying on the surrounding cabinet for additional sealing. Front-mounted status indicators provide a visible view of module operation and help identify activity across the connected EtherCAT branches.
Segment runs may extend up to 100 m between devices when at least Category 5 twisted-pair cable is used, maintaining reliable signal levels across widely separated machine sections. EtherCAT Hot Connect allows predefined network groups to connect to or disconnect from the active communication system without requiring a restart of the complete network. The distributed clock function maintains axis synchronization with submicrosecond jitter, supporting coordinated movement and time-sensitive measurement tasks. Electromagnetic emissions comply with EN 61000-6-4, while electromagnetic immunity complies with EN 61000-6-2, allowing operation in areas affected by switching noise or heavy machinery. Vibration testing follows EN 60068-2-6, and shock testing follows EN 60068-2-27 to verify stable communication when motion or impact occurs near the installation.
