Beckhoff BK3120
Beckhoff BK3120
Beckhoff BK3120
Beckhoff BK3120
Beckhoff BK3120
Beckhoff BK3120
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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power supplies brand new Beckhoff BK3120 bus couplers, providing automation engineers with a reliable next-generation interface.

BK3120

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The Beckhoff BK3120 is a PROFIBUS DP "Economy plus" Bus Coupler designed for scalable, high-speed modular I/O integration.
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Technical specifications for BK3120

  • Manufacturer:
    BECKHOFF
  • Part Number:
    BK3120
  • Product Family:
    BECKHOFF
  • Product Type:
    Bus Coupler
  • Stock:
    1
  • Max. I/O Capacity:
    128 bytes input / 128 bytes output
  • K-bus Extension:
    Up to 255 Terminals
  • Power Supply:
    24 V DC (-15% / +20%)
  • Input Current:
    70 mA + (Total K-bus current)/4; Max. 500 mA
  • K-bus Current Supply:
    1750 mA
  • Operating Temperature:
    -25°C to +60°C
  • Storage Temperature:
    -40°C to +85°C
  • Protection Class:
    IP20
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    4.7x6.8x8.8cm
  • Tariff Code:
    8537109090
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Manuals Applications Performance & Efficiency Environmental Ratings

Features:

  • High-Density Modular Expandability
  • Advanced PROFIBUS DP V1 Diagnostics
  • Robust "Economy Plus" Architecture
The Beckhoff BK3120 leverages K-bus extension technology to manage up to 255 Bus Terminals from a single coupler. This massive expansion capability allows engineers to build highly customized, dense I/O nodes that perfectly match the specific signal requirements of a machine, drastically reducing the footprint of the control cabinet.

Unlike standard couplers, the Beckhoff BK3120 incorporates DP V1 services to provide deeper insight into the fieldbus health. Users can perform acyclic data communication to remotely access terminal parameters, set operational limits, and retrieve detailed error logs, ensuring proactive maintenance and reduced machine downtime.

Designed as a cost-effective yet high-performance solution, the Beckhoff BK3120 is built to withstand harsh industrial conditions. Its compact housing is rated IP20, and the device is tested for high vibration and shock resistance, ensuring that the critical communication link remains stable even in high-speed, high-stress manufacturing environments.

The BK3120 Beckhoff PROFIBUS Bus Coupler may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Beckhoff BK3120 PROFIBUS Bus Coupler Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Beckhoff BK3120 PROFIBUS Bus Coupler

General

  • Manufacturer Beckhoff
  • Model BK3120
  • Condition New Original ready stock
  • Product Family EK1914,CX2030-0130,CX1020-0000
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Automotive Assembly: The BECKHOFF BK3120 acts as a central communication node in automotive production lines, reliably linking hundreds of discrete I/O points to the main PLC.
  • Packaging Machinery: Due to its "Economy plus" architecture, the BECKHOFF BK3120 provides high-speed data updates for rapid-cycle packaging machines, ensuring precise synchronization of sensors and actuators.
  • Distributed Process Control: The unit is ideal for large-scale logistics and warehouse systems, where its ability to bridge 255 terminals minimizes complex field wiring over long distances.
  • Hazardous Area Monitoring: With its ATEX/Ex certification, the BECKHOFF BK3120 is a preferred choice for integration in chemical or energy facilities requiring specialized, intrinsically safe signal handling.
  • High-Speed Communication: The BECKHOFF BK3120 automatically detects baud rates up to 12 Mbaud, ensuring that communication overhead is minimized and process data is delivered with minimal latency.
  • Flexible I/O Mapping: By supporting 128 bytes of input and 128 bytes of output data, the BECKHOFF BK3120 offers sufficient bandwidth for complex automation tasks without the need for additional network nodes.
  • Optimized K-bus Expansion: The device allows for a highly modular configuration, supporting up to 255 Bus Terminals, which significantly improves system density and reduces the required cabinet footprint.
  • Advanced Parameterization: By leveraging DPV1 services, the BECKHOFF BK3120 enables remote parameter adjustments and limit monitoring, which drastically reduces the need for manual configuration on the factory floor.
  • Thermal Resilience: With a wide operating range of -25°C to +60°C, the BECKHOFF BK3120 maintains operational integrity in non-climate-controlled factory environments or extreme outdoor industrial cabinets.
  • Vibration and Shock Tolerance: The BECKHOFF BK3120 is tested to EN 60068 standards, ensuring that it remains connected and stable even when mounted on machinery with high levels of operational vibration.
  • Electromagnetic Compatibility (EMC): Engineered to surpass EN 61000 industrial EMC standards, the BECKHOFF BK3120 effectively filters noise in environments dense with motors, drives, and high-frequency switching.
  • Robust Housing Design: Featuring an IP20 rating, the BECKHOFF BK3120 housing provides durable protection for internal components, ensuring long-term reliability against dust and mechanical touch in standard electrical enclosures.
Description
The Beckhoff BK3120 serves as the critical link between the PROFIBUS fieldbus system and the extensive Beckhoff Bus Terminal ecosystem. Engineered for versatility, this "Economy plus" coupler automatically detects baud rates up to 12 Mbaud, ensuring seamless integration into existing industrial networks while maintaining high-speed data exchange for real-time automation tasks.

By utilizing the advanced K-bus extension technology, the BK3120 supports the connection of up to 255 spatially distributed Bus Terminals. This modularity allows system integrators to configure compact, application-specific I/O stations, significantly reducing wiring complexity and cabinet space requirements in distributed control architectures.

Equipped with PROFIBUS DP V1 service capabilities, the BK3120 facilitates not only cyclic process data exchange but also acyclic parameterization and complex diagnostics. This makes the BK3120 ideal for applications where remote configuration, limit adjustment, and deep-level diagnostic feedback from field devices are mission-critical for operational efficiency.

The ruggedized design of the BK3120 ensures reliability in demanding industrial environments. With its wide operating temperature range and robust EMC performance, it provides a stable communication backbone for diverse sectors, including machine building, process control, and large-scale manufacturing lines that require long-term durability and consistent throughput.
Alternative Names
8K3120 BK3I20 BK312O EK1914 CX2030-0130 CX1020-0000
Technical notes
The Beckhoff BK3120 features an integrated D-sub 9-pin interface supporting high-speed PROFIBUS DP V1 communication, enabling both cyclic process data and acyclic parameterization. It provides advanced diagnostic capabilities via status LEDs, allowing for rapid fault detection and simplified maintenance in distributed I/O systems.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How does the Beckhoff BK3120 handle firmware/software compatibility?
The Beckhoff BK3120 is designed for long-term compatibility with standard PROFIBUS configuration tools. Firmware updates are generally managed via the Beckhoff KS2000 software interface to ensure the device remains compliant with evolving network standards.
Can the Beckhoff BK3120 support third-party fieldbus masters?
Yes, the Beckhoff BK3120 is fully compatible with any standard-compliant PROFIBUS DP master. It requires the correct GSD file to be imported into the third-party engineering software to ensure seamless I/O mapping.
How can I perform deep diagnostics on the Beckhoff BK3120?
Diagnostic information for the Beckhoff BK3120 can be retrieved through the PROFIBUS bus system using DP V1 diagnostic channels or via the status LEDs (RUN, BF, DIA, I/O RUN, I/O ERR) located on the front panel for visual troubleshooting.
What are the environmental constraints for installing the Beckhoff BK3120?
The Beckhoff BK3120 should be installed in an environment with ambient temperatures between -25°C and +60°C. Ensure the cabinet provides adequate ventilation to prevent overheating, especially when the K-bus load is at its maximum.
Does the Beckhoff BK3120 hold international safety certifications?
Yes, the Beckhoff BK3120 is compliant with major international standards including CE, UL, cULus, and Ex/ATEX certifications, making it suitable for hazardous and demanding industrial zones globally.