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      1756-CNBR

      ControlLogix communication module

      Product Information

      Product Describe

      ControlLogix communication module. This

      module is a ControlNet Bridge communication

      module that features Two (2) ControlNet

      ports supporting simplex and redundant

      ControlNet network


      • Manufacturer:
        Allen-Bradley
      • Product Category:
        PLC System
      • 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
      • Stock:
        30
      By purchasing this item, you agree to the Terms & Conditions
      Moore Automated is NOT an authorized distributor of Allen-Bradley
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          FAQ

          • 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.

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