BK5120/PL3 Beckhoff
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The Beckhoff BK5120/PL3 is part of the BK EtherCAT Bus Couplers series and features support for up to 960 digital and 60 analog input/output points. This unit operates on a 24 VDC supply voltage, has a power contact current rating of 10 A, and measures 100 mm high, 50 mm wide, and 68 mm deep. The BK5120/PL3 accommodates 64 bus terminals and provides an isolation voltage of 500 V.
Internal Product Review
The BK5120/PL3 is a Beckhoff EtherCAT bus coupler that stands out for support of 64 bus terminals and up to 960 digital inputs/outputs. A 24 VDC supply and 10 A power contact capacity make the unit especially well suited for dense distributed I/O layouts. The 500 V isolation rating is a strong technical advantage for dependable industrial network integration.
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Product Description:
The BK5120/PL3 is an EtherCAT bus coupler produced by Beckhoff within the BK EtherCAT Bus Couplers series. Acting as the network interface for a stack of Beckhoff Bus Terminals, it converts EtherCAT process data to the internal K-bus so that discrete and analog field signals reach an automation controller. By providing local power distribution and galvanic isolation, the unit enables modular I/O islands to be deployed inside control cabinets without additional gateways.
Designed for mixed signal installations, the coupler supports 960 inputs/outputs on its digital channels and another 60 inputs/outputs for analog measurements or control, all routed through a total of 64 terminal slots directly attached to the K-bus. The host PLC exchanges process data through 16 receive and 16 transmit PDOs, and the EtherCAT port achieves a network update time that reflects the internal cycle. Field wiring remains protected because the coupler withstands 500 V of isolation between system and I/O potentials. Power is supplied at 24 VDC, and the integrated feed-through contacts can deliver up to 10 A to downstream terminals so that actuators share the same supply rail. A five-pole open-style bus connector accepts the incoming EtherCAT segment, while the maximum input current of 500 mA covers the electronics and status LEDs.
Internal electronics draw their energy from the K-bus, where the backplane can furnish up to 1750 mA, allowing expansion to 255 terminals when a K-bus extender is used. EtherCAT process data are forwarded at 1 Mbit/s, matching the timing requirements of medium-sized synchronous motion or monitoring tasks. Mechanical dimensions simplify cabinet planning; the housing measures 50 mm wide, 68 mm deep, and 100 mm high, so multiple couplers can be lined up without exceeding standard DIN-rail enclosure depths. Together these electrical, communication, and form-factor characteristics position the BK5120/PL3 as a compact edge interface for distributed Beckhoff terminal blocks.
