The Allen-Bradley 1756-CNBR is a communication module for the ControlLogix series of programmable logic controllers (PLCs) made by Rockwell Automation. It’s specifically a ControlNet Bridge communication module, meaning it can connect your ControlLogix PLC to a ControlNet network.

• Dual ControlNet ports: It has two ports that can be used for simplex (one-way) or redundant (failover) communication on a ControlNet network.
• Network Access Protocol (NAP): It has an RJ-45 port for NAP communication.
• Communication speed: Supports a communication rate of 5 Mbps.
• ControlNet connections: Allows for 40-48 logical connections on the ControlNet network.

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