The Allen-Bradley 1756-CNBR is a ControlNet Redundant Bridge Module that links a ControlNet network to a Rockwell ControlLogix 1756 backplane. Designed for redundancy, it provides dual network paths (A and B) to maintain communication in the event of a cable or device failure. The module supports 40–48 ControlNet device connections and is offered as 1756-CNBR and 1756-CNBRK (the K denotes a mounting kit) in Rockwell catalogs. It is documented in ControlLogix Scanner Module catalogs alongside the non-redundant 1756-CNB/1756-CNBK, ensuring compatibility with ControlLogix racks.
