Allen Bradley 1756-CNB/E ControlLogix ControlNet Bridge Module

FAQ

Q1: What is the Allen Bradley 1756-CNB/E?
A: It is a ControlLogix ControlNet Bridge Module used to provide ControlNet communication within a ControlLogix system.

Q2: What communication network does it support?
A: It supports the ControlNet industrial communication network.

Q3: What ControlNet connection does the module use?
A: It provides one ControlNet BNC port and one RJ45 Network Access Port (NAP).

Q4: What is the communication speed?
A: The ControlNet transmission rate is 5 Mbps.

Q5: How many connections can the 1756-CNB/E support?
A: It supports up to 64 ControlNet connections, with 40–48 Logix communication connections depending on configuration.

Q6: Which cable is used for the ControlNet connection?
A: Rockwell specifies the 1786-RG6 quad-shield RG6 coaxial cable for the ControlNet network. The NAP uses a 1786-CP cable.

Q7: Is the 1756-CNB/E discontinued?
A: Yes. Rockwell Automation lists the 1756-CNB family as discontinued effective December 31, 2024, with the 1756-CN2 listed as an engineering replacement.

Q8: What are the dimensions and weight?
A: The commonly listed dimensions are approximately 145 × 35 × 140 mm, and the manufacturer specifies an approximate weight of 0.26 kg.

1756-CNB/E Allen Bradley

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