BK3500 Beckhoff
Wake Industrial LLC is not an authorized distributor of this product.
MPN: BK3500-0000
The Beckhoff BK3500 is part of the BK EtherCAT Bus Couplers series and features support for up to 512 digital inputs or outputs and 64 analog signals. It operates on a supply voltage of 24 VDC with a 10 amp power contact load and is rated for IP20 protection class. The coupler includes optical fiber bus connection, a baud rate of 1.5 Mbaud, and supports up to 64 bus terminals.
Internal Product Review
The BK3500 is a Beckhoff EtherCAT bus coupler that stands out for efficient terminal integration, supporting up to 64 bus terminals and 128 bytes of process data. A 24 VDC supply and IP20 protection make this unit well suited for clean, controlled cabinet installations. High signal density with 512 digital inputs/outputs and 64 analog inputs/outputs makes this coupler a very capable choice for dense automation nodes.
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Product Description:
The BK3500 is a Lightbus coupler produced by Beckhoff within the BK Bus Couplers series. The unit links as many as 64 Beckhoff bus terminals to a Lightbus network, allowing plant controllers to gather field signals and operate actuators through a single optical-fiber channel. By translating terminal-level K-bus data into Lightbus telegrams, the coupler provides deterministic I/O exchange for compact machines and distributed control cabinets. Its modular arrangement allows different terminal types to be placed together on one station, reducing the amount of separate field wiring required inside an enclosure.
The fieldbus side communicates at 1.5 Mbaud, while the terminal side can support up to 64 analog inputs and outputs alongside 512 digital inputs and outputs through the internal K-bus. A single 1 × optical-fiber, 2 HP simplex connector provides the fieldbus interface, and as many as 64 bus terminals can be installed without an additional coupler. The device handles process images of 128 bytes, giving the controller a contiguous data area for fast cyclic access. System electronics draw 500 mA from the backplane during normal operation. The external line provides a 24 VDC supply for the coupler and connected terminal system. Power contacts on the terminal strip distribute a separate supply to field devices without routing load current through the communication electronics.
The I/O area is galvanically isolated from the fieldbus with a dielectric strength of 500 V, helping prevent unwanted current flow between the two sections. Incoming power is protected by a fuse with a 10 A rating. The K-bus supplies up to 1750 mA to operate the connected terminal electronics, while separate power contacts can carry 24 VDC at 10 A to field loads. During startup, the device can momentarily draw 2.5 times its continuous current, so the selected power source must accommodate the temporary inrush. When installed inside a suitable control enclosure, the housing provides IP20 protection against contact with hazardous internal parts and the entry of larger solid objects. The coupler mounts on a standard rail, and adjacent terminals connect directly through the integrated side contacts for data and power distribution.
