BK5120 Beckhoff
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The BK5120 is an EtherCAT bus coupler manufactured by Beckhoff in the BK EtherCAT Bus Couplers series. It supports up to 960 digital and 60 analog peripheral input or output signals, with a total of 64 bus terminals. The device uses a 24 VDC power supply and has a maximum power contact current of 10 Amps. It features a 5-pole open-style connector and an IP20 protection class.
Internal Product Review
BK5120 is a Beckhoff EtherCAT bus coupler that stands out for accommodating up to 64 bus terminals and 960 digital inputs/outputs. IP20 protection and a 24 VDC power supply support dependable cabinet-level integration in automated systems. A strong choice for high-density I/O architectures, especially with 1750 mA max K-bus current.
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Product Description:
The BK5120 is a bus coupler produced by Beckhoff for the BK Bus Couplers series. It links field-level terminal blocks to a CANopen network so a controller can access distributed I/O without separate gateways. Within an automation cell, the unit mounts beside standard Beckhoff terminals and forwards their process data to the real-time fieldbus, allowing compact, decentralized signal acquisition near sensors and actuators.
This coupler supports up to 960 digital input and output signals across as many as 64 bus terminals, while a single five-pole open-style connector carries the CANopen line. A cage-clamp wiring system secures conductors without requiring torque tools, simplifying field connections and helping maintain consistent contact pressure. The coupler supports 16 receive and 16 transmit CANopen process data objects for exchanging cyclic information with the controller. Its control electronics draw a maximum current of 500 mA, while the power contacts can carry up to 10 A for downstream modules when protected by the recommended fuse. A shared 24 VDC supply energizes the internal K-bus and the power contacts, avoiding the need for separate supply rails inside the panel. The open connector supports straightforward bus continuation to adjacent network devices.
The coupler accommodates up to 60 analog input and output signals, while the internal K-bus can provide as much as 1750 mA to connected terminals. Its housing measures 50 × 100 × 68 mm, allowing the device to occupy a narrow section of a DIN rail while leaving room for neighboring terminals. The IP20 enclosure protects against accidental contact with internal electrical parts but requires installation inside a suitable cabinet. Natural airflow around the housing supports convection cooling when the required installation clearances are maintained. Operation remains stable at relative humidity levels of up to 95 percent, provided condensation does not form. Spring-loaded clamps maintain conductor contact pressure as ambient conditions change, helping preserve dependable signal and power connections throughout operation.
