BK5110 Beckhoff
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The BK5110 is an EtherCAT bus coupler manufactured by Beckhoff and is part of the BK EtherCAT Bus Couplers series. It supports up to 256 digital inputs and outputs, and connects to a 35 mm mounting rail. The unit features 64 bus terminals, operates on a 24 VDC power supply, and has a protection class of IP20.
Internal Product Review
The BK5110 is a Beckhoff EtherCAT bus coupler with support for 64 bus terminals and 256 inputs/outputs. IP20 protection and a 24 VDC power supply make cabinet-level integration straightforward and technically appealing. A strong choice for dense I/O architectures, especially with 500 mA K-bus supply capacity.
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Product Description:
The BK5110 is a compact EtherCAT bus coupler manufactured by Beckhoff within the BK EtherCAT Bus Couplers series. It provides the communication gateway that links an EtherCAT master to a stack of Beckhoff I/O terminals, converting real-time fieldbus frames into the local K-bus signal format. By handling address allocation and power distribution for the attached terminals, the device simplifies node expansion in machinery and process lines where fast digital acquisition and actuation are required.
It operates from a 24 VDC supply and routes this potential to the power contacts, where the permissible load reaches 10 A. The coupler itself draws a maximum of 200 mA, leaving capacity on the upstream supply for terminal electronics. Up to 256 inputs and outputs can be addressed, and process data objects are exchanged through an EtherCAT frame during every cycle. The housing measures 50 × 100 × 68 mm, so multiple couplers can fit side by side in shallow enclosures. The enclosure has an IP20 protection rating, making the device suitable for installation in dry control panels that protect it from dust and moisture. The coupler does not include analog signal handling, so attached terminals must provide any required analog-to-digital or digital-to-analog conversion.
The EtherCAT line attaches through one open-style five-pole connector on the front panel, while the 35 mm mounting rail clip secures the housing to standard EN 50022 profiles. Up to 64 terminals can be connected in sequence, and their local logic is powered by the K-bus, which supplies 500 mA at 5 V. Application data are exchanged through five receive PDOs and five transmit PDOs, collectively represented as 5/5. During power-up, the device draws an inrush current equal to 2.5 times the continuous current. The 24 VDC power source should account for this temporary demand to prevent voltage drops while the coupler and connected terminals start. The open-style connector provides direct access to the network conductors, and the rail-mounted format allows the terminal stack to remain securely aligned inside the control panel.
