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      In Stock
      ControlLogix communication module

      1756-CNBR

      Spare Part Number

      PN1756CNBR

      Product Information:

      ControlLogix communication module. This

      module is a ControlNet Bridge communication

      module that features Two (2) ControlNet

      ports supporting simplex and redundant

      ControlNet network


      • One-year warranty
      • Global shipping
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      Technical specifications for

      1756-CNBR

      0 TECHNICAL PARAMETERS
      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC and Machine Control
      • Spare Part Number:
        1756CNBR
      • Estimated shipping dimensions:
        17x13x3.2cm
      • Weight:
        0.25 kg
      • Tariff Code:
        8537101190
      • Country of origin:
        USA
      • Place of shipment:
        Xiamen, Fujian, China
      • No. of Ports:
        Two (2) ControlNet ports
      • Isolation Voltage:
        30 Volts Continuous
      • Power Dissipation (Max):
        5.5 Watts
      • Enclosure:
        Open Type
      • Operating Temperature:
        32-140 Fahrenheit (0-60 Celsius)
      • ControlNet Rate of Communication:
        5 Mbps
      • Current Draw at 5.1 Volts DC:
        970 Miliamperes
      • Product Line:
        ControlLogix
      • Series:
        Allen-Bradley ControlLogix
      • Stock Availability:
        30
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      Manuals

      PRODUCT & ORDER FAQS

      Questions buyers ask about 1756-CNBR

      • What primary communication role does the 1756-CNBR serve within a ControlLogix architecture?

        The 1756-CNBR is a ControlNet redundant bridge module that facilitates deterministic data exchange between a ControlLogix controller backplane and the ControlNet network, enabling both scheduled and unscheduled messaging for real-time industrial automation.

      • How does the 1756-CNBR implement redundancy to enhance network fault tolerance?

        The 1756-CNBR supports two independent ControlNet BNC ports (A and B), allowing dual-media ControlNet trunk connections. This redundant media capability helps maintain network communication continuity if one physical path is interrupted.

      • How many communication connections can the 1756-CNBR maintain for Logix devices and other nodes?

        This module can support 40 to 48 Logix communication connections, and up to 64 total bidirectional connections, accommodating a large number of peers in complex industrial networks. It also supports up to 99 ControlNet nodes on the network.

      • What physical cabling and connector types are used by the 1756-CNBR for ControlNet media?

        The 1756-CNBR uses quad-shielded RG-6 coaxial cable terminated via BNC connectors for the redundant media paths, which is required for reliable ControlNet signal integrity over long distances.

      • What are the electrical and backplane power specifications of the 1756-CNBR?

        The module draws approximately 970 mA at 5.1 VDC from the ControlLogix backplane and 1.7 mA at 24 VDC, with a typical power dissipation of ~5.1 W and corresponding thermal load.

      • How does the module’s isolation rating contribute to electrical protection in a control system?

        The 1756-CNBR provides 30 V continuous basic insulation between the ControlNet media connections and the backplane, enhancing electrical safety and reducing susceptibility to ground loops or network-induced noise.

      • Is the 1756-CNBR still current, and what is the replacement strategy for future deployments?

        The 1756-CNBR is officially discontinued as of December 31, 2024. Customers are advised to plan migrations to newer modules such as the 1756-CN2R series, which provides similar redundant ControlNet communications with updated platform support.
      All FAQ
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          Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.

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