EK1122-0008 Beckhoff
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The EK1122-0008 is an EtherCAT coupler manufactured by Beckhoff and is part of the EK EtherCAT Couplers series. It features two ports, supports star topology, and has IP20 protection class. Distributed Clocks are supported, and unused ports are bridged.
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Product Description:
The EK1122-0008 is an EtherCAT junction coupler in the EK EtherCAT Couplers series from Beckhoff. The unit acts as a branching node within an EtherCAT network, enabling star wiring arrangements that connect multiple I/O terminal strings to a single master port. It distributes the serial EtherCAT telegram stream across two independent branches, simplifying panel layouts and reducing cable runs in distributed control cabinets. This arrangement is useful in industrial automation systems that include separate motion, sensing, and safety segments. Each connected branch remains part of the same EtherCAT network and communicates with the central master through the junction.
The coupler provides 2 ports, each equipped with an RJ-45 connector that forwards frames in full-duplex mode. The device supports a star topology, eliminating daisy-chain dependencies between downstream terminal blocks and allowing each branch to be routed separately. An IP20 protection rating makes the unit suitable for installation inside protected industrial enclosures while guarding against accidental finger contact and larger solid objects. Support for Distributed Clocks allows sub-microsecond synchronization of drive and I/O cycles across connected network segments. Because hot swapping is not supported, power must be removed before the unit is detached from or inserted into the terminal assembly. The RJ-45 interfaces provide a familiar physical connection for standard EtherCAT cabling within the control cabinet.
Firmware compatibility requires a minimum EtherCAT XML description file version of 0017, allowing the master to recognize the available mailbox and junction functions. Port arbitration gives priority to Junction 1, maintaining consistent frame ordering when traffic reaches both branches. If one branch is unused, the hardware keeps that connection in a bridged state, preserving communication with the remaining network segment. The coupler follows the signaling conventions used by TwinCAT controllers and standard EK terminal blocks. Its compact terminal-style housing permits placement alongside other EtherCAT components without requiring a separate network enclosure. Diagnostic behavior remains available through the EtherCAT system, allowing branch communication to be monitored from the connected controller software.
