BK3520 BECKHOFF

BK3520 BECKHOFF Controller module

Product  Description：

The Beckhoff BK3520 is a high-performance Economy Plus Bus Coupler designed to connect the modular Beckhoff Bus Terminal system to the SERCOS interface (SErial Real-time COmmunication System). Acting as a gateway between the fieldbus and the I/O terminals, the BK3520 allows for the integration of standard Beckhoff digital and analog input/output terminals into a high-speed fiber optic SERCOS network. This model is specifically optimized for high-speed data transmission and synchronization, making it a reliable choice for complex automation architectures.

Product Parameters

The BK3520 features a SERCOS interface with a data transfer rate of either 2 Mbaud or 4 Mbaud. It utilizes fiber optic cables for communication, providing immunity to electromagnetic interference and supporting distances up to 40 meters between two nodes using plastic fiber. The maximum distance can be extended significantly with specialized fiber types. The unit operates on a 24 VDC power supply and provides a peripheral current of up to 1750 mA to the connected Bus Terminals. It can support up to 64 Bus Terminals per station, accommodating a maximum of 255 digital I/O points or a corresponding number of analog signals. The device is housed in a compact enclosure with dimensions of approximately 100 mm x 50 mm x 68 mm and carries an IP20 protection rating.

Product Advantages

One of the primary advantages of the BK3520 is its seamless integration into the SERCOS ring, which is renowned for its high deterministic performance and synchronization capabilities. The use of fiber optics ensures a noise-free communication channel, which is a major benefit in electrically noisy industrial environments. As an "Economy Plus" version, it offers an excellent balance between cost and performance, providing faster processing than standard bus couplers while maintaining a compact footprint. Its modularity allows users to mix and match various I/O types—such as digital, analog, and specialized terminals—providing high flexibility in system design. Furthermore, it supports the automatic configuration of the K-bus, reducing commissioning time.

Important Considerations and Precautions

When installing and operating the BK3520, it is crucial to pay attention to the fiber optic connections. The fiber ends must be prepared cleanly and inserted fully into the connectors to prevent signal loss or communication errors. Users should avoid tight bends in the fiber optic cables, as this can damage the core and degrade performance. Because the unit has an IP20 rating, it must be installed in a clean, dry control cabinet or housing to protect it from dust and moisture. Before performing any wiring or terminal changes, ensure that the power supply is disconnected to prevent damage to the internal electronics or the K-bus interface. Additionally, ensure that the total current consumption of the connected I/O terminals does not exceed the power supply capacity provided by the coupler.

Product Applications

The BK3520 is primarily utilized in motion control and CNC applications where the SERCOS interface is the standard communication protocol. It is frequently found in high-speed packaging machinery, textile equipment, and printing presses where precise synchronization between various axes and I/O points is required. Its ability to handle both high-speed digital signals and precise analog data makes it ideal for distributed I/O stations in large-scale manufacturing cells. It is also used in wood processing and metalworking machines where the SERCOS ring provides a robust backbone for real-time control and diagnostics across multiple nodes.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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