BK3520 BECKHOFF

BK3520 BECKHOFF bus coupler

Brand：BECKHOFF Model number：BK3520

Country of origin: Germany Product weight：0.09kg

HS code：8517623990

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Product Details：

Product Dimensions：

The Beckhoff BK3520 is a high-performance Economy Bus Coupler designed to link the Economy serial Bus Terminal system to the ControlNet network. It serves as a gateway between the fieldbus and the modular Beckhoff I/O system, allowing the ControlNet master to communicate with up to 64 connected Bus Terminals. As part of the Economy series, it provides a cost-effective solution for small to medium-sized I/O stations where high-speed, deterministic communication is required without the full overhead of larger coupler models.

Technical Specifications

Fieldbus Protocol: ControlNet (RG-6 coaxial cable)
Number of Bus Terminals: Connects up to 64 Bus Terminals, supporting a maximum of 255 digital or analog I/O points.
Bus Interface: One BNC socket for ControlNet connection.
Transmission Rate: Fixed at $5 \text{ Mbit/s}$ according to ControlNet specifications.
Power Supply: $24 \text{ VDC}$ ( $-15\% / +20\%$ ).
Current Consumption: Approximately $170 \text{ mA}$ plus the current required for the K-bus (internal backplane).
K-Bus Current: Up to $500 \text{ mA}$ to power the connected I/O terminals.
Baud Rate Selection: Set via address switches or software.
Isolation: $500 \text{ Vrms}$ between the fieldbus and the internal electronics.
Operating Temperature: $0\text{°C}$ to $+55\text{°C}$ ( $32\text{°F}$ to $131\text{°F}$ ).
Dimensions: Approximately $51 \text{ mm} \times 100 \text{ mm} \times 68 \text{ mm}$ ( $W \times H \times D$ ).

Product Advantages

Optimized Cost-Efficiency: As an Economy version, the BK3520 offers the essential functions of a bus coupler at a lower price point, making it ideal for distributed I/O stations with moderate complexity.
Deterministic Communication: By utilizing the ControlNet protocol, the coupler ensures repeatable and predictable data transfer, which is critical for precision control applications.
Modular Flexibility: It allows for the mixing and matching of various digital, analog, and specialty Beckhoff Bus Terminals on a single node, providing high granularity and customization.
Compact Design: The small form factor saves significant rail space in control cabinets, which is a major benefit in dense industrial environments.
Ease of Configuration: The module is recognized automatically by the Beckhoff TwinCAT system and other standard ControlNet configuration tools, streamlining the commissioning process.

Operational Precautions

Address Selection: Ensure that the ControlNet MAC ID (address) is correctly set via the hardware rotary switches before powering on the system, as duplicate addresses will cause network conflicts.
Bus Termination: Proper termination of the ControlNet cable is required at both ends of the trunk line to prevent signal reflections and ensure network stability.
Power Budgeting: Carefully calculate the total current consumption of all connected I/O terminals to ensure the BK3520’s internal K-bus power supply ( $500 \text{ mA}$ ) is not exceeded.
Cable Handling: Use high-quality RG-6 coaxial cables and BNC connectors specifically rated for ControlNet to maintain signal integrity and prevent data drops.
Environmental Protection: The unit must be installed in a NEMA or IP-rated enclosure that protects it from moisture, conductive dust, and corrosive gases, as it is designed for an IP20 environment.

Typical Product Applications

The BK3520 is widely used in industries that rely on Rockwell Automation or other ControlNet-based control architectures.

Automotive Assembly: Connecting distributed sensors and actuators on conveyor lines and robotic cells where high synchronization is necessary.
Food and Beverage: Managing analog signals for temperature and pressure control alongside digital signals for valves and pumps in processing plants.
Material Handling: Implementing remote I/O stations for sorting systems and automated storage and retrieval systems (AS/RS).
Machine Building: Serving as a compact I/O node for specialized machinery that requires a reliable link to a central PLC over long distances.
Water and Wastewater: Providing a robust communication interface for remote pump stations and monitoring equipment where the distance between nodes is significant.

We have the same series of models in stock. If you don't find the model you need, please contact us and we will provide you with an official quotation！

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