BK3520 Beckhoff
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The Beckhoff BK3520 is part of the BK EtherCAT Bus Couplers series and supports up to 64 analog and 1020 digital signal inputs or outputs. It features a 24 VDC power supply, 10 A maximum contact load, and an IP20 protection class. The bus coupler is equipped with 2 optical fiber bus connections and can handle up to 64 bus terminals, expandable to 255 with K-Bus extension.
Internal Product Review
The BK3520 is a Beckhoff EtherCAT bus coupler with IP20 protection and variable installation positioning. Support for 1020 digital inputs/outputs and 64 analog inputs/outputs gives the unit impressive signal density for demanding terminal assemblies. A 128-byte process data image and 2 optical-fiber bus connections make the BK3520 a strong choice for stable, high-capacity bus coupling.
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Product Description:
The BK3520 is a bus coupler manufactured by Beckhoff as part of the BK Bus Couplers series. The unit operates as an interface between the fieldbus network and K-bus I/O terminals, allowing distributed sensors and actuators to be grouped and exchanged with a PLC through one process image. Within an automation cell, the coupler converts incoming communication telegrams into terminal-level data so that mixed analog, digital, and specialty modules can operate on the same station. Its role is to connect the control network to the attached terminal stack while keeping local signal handling organized inside the cabinet.
On the I/O side, the coupler forwards up to 64 inputs/outputs of analog data and manages up to 1020 inputs/outputs for discrete signals, consolidating them into a process image of 128 bytes. Field communication is handled through 2 x optical fibers, providing electrical isolation and stable transmission over longer distances than copper links typically allow. The local station starts with 64 standard bus terminals, and with a K-bus extension it can be expanded to 255 terminals, all supported by an internal supply rail rated at 1750 mA. The electronics are powered from an external 24 VDC source, and the startup current can rise to 2.5 times the continuous demand, which should be considered when selecting the power supply.
A user-replaceable fuse rated at 10 A protects the backplane from overloads, and output circuits must remain below the contact voltage limit of 24 VDC. Insulation spacing is verified for a dielectric strength of 500 V, and the housing has an IP20 protection class for cabinet-mounted use. Terminal contacts can carry loads up to 10 A, which supports direct wiring of relays or solenoid valves in many control panels. The coupler can be mounted horizontally or vertically because the permitted installation position is variable, which helps when the terminal row must fit around wiring ducts or other cabinet components.
