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      BK3120

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      Product Information

      Product Describe
      BK3120
      PROFIBUS BUS COUPLER
      FOR UP TO 64 BUS TERMINALS
      (255 WITH K-BUS EXTENSION)
      12 MBAUD
      ECONOMY PLUS

      Technical specifications for BK3120

      • Product Model
        BK3120
      • Product Parameters
        PROFIBUS Economy plus Bus Coupler
      • Tariff Code
        8537101190
      • Country of origin
        GERMANY
      • Place of shipment
        Xiamen, China
      • Estimated Shipping Size
        5.1x10.2x7.0cm
      • Manufacturer
        BECKHOFF
      • Weight
        0.2 kg
      • Number of Bus Terminals
        64 (255 with K-bus extension)
      • Max. number of bytes fieldbus
        128 byte input and 128 byte output
      • Data transfer rates
        automatic detection up to 12 Mbaud
      • Bus interface
        1 x D-sub 9-pin socket with shielding
      • Data transfer medium
        shielded copper cable, 2 x 0.25 mm²
      • Power supply
        24 V DC (-15%/+20%)
      • Input current
        70 mA + (total K-bus current)/4, 500 mA max
      • Current supply K-bus
        1750 mA
      • Power contacts
        max. 24 V DC/max. 10 A
      • Electrical isolation
        500 V (power contact/supply voltage/fieldbus)
      • Operating temperature
        -25…+60°C
      • Storage temperature
        -40…+85°C
      • Relative humidity
        95%, no condensation

      • Factory New

        These are new and current items that are procured from the manufacturer.

      • New No Package

        These parts are new. They have not been used, but their original packaging is no longer available.

      • New In Opened Package

        These parts are new. They have not been used, but their original packaging has been opened or the packaging is significantly aged.

      • New In Sealed Package

        Parts are new. They have not been used and still have their original package seal intact.

      • New in Original Package

        These parts are new. The packages were not originally sealed by their original manufacturer.

      Warranty Period & Disclaimer

      Amikon is not an authorized distributor unless otherwise specified, representative, or affiliate of the manufacturer of this product. All trademarks and documents are the property of their respective owners and are provided for identification and informational.

      FAQs

      • What is the communication interface?+
        It uses a 1 x D-sub 9-pin socket for PROFIBUS communication.
      • How much power is available for the K-bus?+
        It provides a maximum K-bus current of 1750 mA
      • What is the BK3120?+
        It is a PROFIBUS DP V1 Bus Coupler designed for connecting Beckhoff Bus Terminals to a PROFIBUS network.
      • What is the power requirement?+
        24 V DC (maximum 10 A for power contacts).
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      Product

      MORE INFORMATION

      Overview Manuals Technical notes Product Applications Electrical Wiring

      Features:

      • Common for all PROFIBUS master
      • PROFIBUS Economy plus Bus Coupler
      • Automatic Baud Rate Detection
      • Flexible Address Configuration
      • Compact DIN-Rail Mounting
      The Economy plus version extends the existing PROFIBUS Bus Coupler series BK3xx0. The K-bus extension technology allows the connection of up to 255 spatially distributed Bus Terminals to one Bus Coupler. The BK3120 has been designed to accommodate automation requirements. The PROFIBUS protocols omit FMS operation in order to be able to transfer more user data in DP mode, which for this Bus Coupler type can be 128 byte inputs and 128 byte outputs. The BK3120 incorporates the PROFIBUS DP V1 services. These services allow direct access to the Bus Coupler register and the complex Bus Terminals in order, for example, to change the parameterization or to set/correct limit values for analog Bus Terminals.

      The BK3120 BECKHOFF PROFIBUS Economy plus Bus Coupler may still be available for purchase and support from Amikon Limited beyond End-Of-Life (EOL) by the manufacturer (OEM).
      BECKHOFF BK3120 PROFIBUS Economy plus Bus Coupler Manuals, Datasheets, Drivers, 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.
      The Beckhoff BK3120 is a "Economy plus" PROFIBUS Bus Coupler designed for high-speed fieldbus communication in industrial automation, featuring PROFIBUS DP V1 services for direct register access and advanced diagnostics. It acts as the interface between the PROFIBUS network and Beckhoff Bus Terminals (K-bus), supporting up to 64 terminals directly, or up to 255 with K-bus extension. 
      • Body Shop & Paint Lines: Manages digital signals for robotic arm movements and proximity sensors
      • Bottle Filling & Packaging: Used in high-speed conveyors to monitor photo-eyes and control solenoid valves
      • Wafer Processing: Supports precision automation tasks from wafer production to chip packaging
      • CNC Centers: Found in vertical machining centers (e.g., Homag machines) for real-time control of axis limits and tool changers
      • Hygienic Control: Often housed in stainless steel control cabinets to manage I/O for cleanroom-standard machinery
      This content has been produced using multiple sources.Amikon takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
      Power Supply: Connect a 24 V DC (-15%/+20%) supply to the designated terminals. This powers both the coupler's internal electronics and the K-bus.
      Power Contacts: Use the separate feed-in points to provide power for the field devices (sensors/actuators). These contacts can handle up to 10 A.
      PROFIBUS Connection: Use a standard D-sub 9-pin socket with shielded copper cable. Ensure the cable is properly grounded to the shell for noise immunity. 
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      Warranty
      All parts new original are covered by Amikon 12 month warranty

      Returns
      No hassle returns policy

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      Payment options
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      For more information, please visit our dedicated payments page.
      Why Choose Amikon Limited?

      When it comes to industrial automation, reliability, speed, and trust matter. At Amikon Limited, we go beyond just supplying parts — we deliver confidence.

      • ● Extensive Inventory Reach: Nearly 1 million automation parts at your fingertips, including legacy and obsolete models.
      • ● 20+ Years of Expertise: Trusted by engineers, project managers and government companies worldwide for our professional service.
      • ● Quality You Can Trust: Each unit is strictly inspected by the warehouse staff to ensure product quality
      • ● Fast Global Shipping: We help you minimize downtime with express logistics worldwide.
      • ● 1-Year Warranty Available: Peace of mind with every purchase backed by one year warranty guarantee.
      •  

      Whether you're maintaining legacy systems or building future-ready projects, Amikon Limited is your dependable partner in precision and performance.


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