BECKHOFF BK1120 EtherCAT Bus Coupler

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Manufacturer: BECKHOFF
Product No.: BK1120
Country of origin:Germany
Product Type: EtherCAT Bus Couplers
Payment: T/T, Western Union
Weight: 150g
Shipping port: Xiamen
Warranty: 12 months

Description

Designed to bridge the gap between high-speed EtherCAT networks and standard K-bus assemblies, the BK1120 serves as an efficient communication interface for modular automation systems. This bus coupler maps the technical signals from standard Beckhoff Bus Terminals directly into the EtherCAT protocol, enabling seamless integration into distributed control architectures without sacrificing legacy terminal compatibility.

The BK1120 establishes a high-performance link between physical I/O points and the controller. It automatically handles the conversion of process data and local bus diagnostic information, presenting it clearly to the EtherCAT master. With dual RJ45 interfaces, this module supports flexible line and daisy-chain topologies, simplifying field wiring and reducing installation costs in complex control environments.

Features

Direct integration of standard K-bus terminals into high-speed EtherCAT networks.
Supports up to 64 standard Bus Terminals directly, and up to 255 Bus Terminals using K-bus extensions.
Equipped with two RJ45 ports for line topology networking up to 100 meters apart.
High-density data handling with up to 1024 bytes of input and 1024 bytes of output process data.
Integrated diagnostic LEDs for quick monitoring of power status, K-bus run, and network communication.

Applications

Industrial machinery and high-speed packaging lines.
Distributed I/O architectures in processing and manufacturing systems.
Retrofitting existing legacy K-bus terminal configurations to modern EtherCAT masters.
Building automation and HVAC control infrastructure requiring high-density point aggregation.

Technical Specifications

Manufacturer	BECKHOFF
Part Number / Model	BK1120
Product Type	EtherCAT Bus Coupler for standard Bus Terminals
Number of Bus Terminals	64 (up to 255 with K-bus extension)
Max. Process Data Space	1024 bytes input / 1024 bytes output
Bus Interface	2 x RJ45
Distance Between Stations	Max. 100 m (100BASE-TX)
Power Supply	24 V DC (-15 % / +20 %)
Input Current	70 mA + (total K-bus current)/4 (500 mA max.)
Starting Current	Approx. 2.5 x continuous current
Current Supply K-Bus	1750 mA
Power Contacts	Max. 24 V DC / Max. 10 A
Recommended Fuse	<= 10 A
Electrical Isolation	500 V (power contact / functional ground / K-bus)
Operating Temperature	-25 to +60 degC
Storage Temperature	-40 to +85 degC
Relative Humidity	95%, no condensation
Weight	Approx. 0.15 kg

Connections and Interfaces

Interface Type	Function
RJ45 Port 1 (IN)	EtherCAT signal input connection from previous station or master
RJ45 Port 2 (OUT)	EtherCAT signal output connection to next station in daisy-chain
Spring Force Terminals	24 V DC power supply input and power contact distribution feed

Installation Guidelines

Mounting: Install on a standard 35 mm DIN rail (EN 60715). Ensure the mounting slide latches firmly onto the rail.
Cabling: Use category 5e (or higher) shielded Ethernet cables to guarantee proper signal integrity and noise immunity.
Grounding: Ensure the DIN rail is reliably connected to a low-impedance functional earth grounding point.
Power Supply Routing: Keep power lines as short as possible and separate them from high-frequency signal cables to prevent interference.

Key Features:

#Beckhoff BK Series #EtherCAT Bus Couplers

What is the maximum number of Bus Terminals supported by the BK1120?

The BK1120 directly supports up to 64 standard Bus Terminals. If a K-bus extension is used, this capacity can be expanded up to 255 terminals.

What Ethernet cables should be used with the BK1120?

It is recommended to use Cat5e (or higher) shielded twisted pair (STP) Ethernet cables to ensure reliable high-speed data transmission over EtherCAT.

What is the maximum current capacity supplied to the K-bus by the BK1120?

The BK1120 provides a maximum current supply of 1750 mA to the internal K-bus for attached terminals.

Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).

For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

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BECKHOFF BK1120 EtherCAT Bus Coupler