EK1561 Beckhoff
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The EK1561 is an EtherCAT coupler manufactured by Beckhoff and is part of the EK EtherCAT Couplers series. It features a supply voltage of 24 VDC and a power contact current rating of 10 Amps. The coupler supports distributed clocks and includes three potential groups with three power contacts.
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Product Description:
The EK1561 is an EtherCAT coupler produced by Beckhoff for the EK EtherCAT Couplers series. It forms the interface between an EtherCAT fieldbus segment and a block of Beckhoff Bus Terminals, allowing an EtherCAT master to scan I/O points in real time while the coupler supplies local backplane power to the terminals. In an automation cabinet, the coupler mounts on a DIN rail beside the terminals, creating a compact node that streamlines wiring among sensors, actuators, and the host controller.
This model is supplied with no CoE interface, so parameter access is handled through standard EtherCAT mailbox protocols rather than CANopen over EtherCAT. For time-critical applications, it offers support for distributed clocks, enabling sub-microsecond synchronization with other EtherCAT devices. The internal E-bus can supply up to 2 A, limiting how many downstream terminals can be powered without an auxiliary supply. The coupler has three potential groups, and each group can carry its own reference potential to separate power domains across the terminal stack. The spring-loaded power contacts support a continuous current of 10 A, permitting the coupler to pass field power to high-load terminals, such as motor starters or valve islands, without external jumpers.
The coupler has three power contacts arranged in parallel with the signal contacts, and these contacts are galvanically separated from the E-bus logic line. Field devices receive power through the contacts at 24 V, maintaining compatibility with standard industrial control voltages. Protection against accidental contact and ground faults requires an incoming source that meets the SELV/PELV safety class. The coupler’s control electronics operate from a 24 VDC logic rail, which also powers the EtherCAT communication interface and status LEDs. This separate power arrangement allows the communication electronics and terminal field circuits to operate through their respective electrical paths. The status indicators provide local visual information about communication and operating conditions within the terminal node.
