Allen Bradley 1756-CNB ControlLogix Communication Module

FAQ

Q1: What is the 1756‑CNB used for?
It is a ControlLogix communication bridge module that connects a ControlLogix chassis to a ControlNet network for real‑time data exchange.

Q2: What network protocol does it support?
It supports the ControlNet networking protocol at speeds up to 5 Mb/s.

Q3: How many ControlNet ports does the 1756‑CNB have?
It has one ControlNet BNC port for non‑redundant network connection.

Q4: How many Logix communication connections can it handle?
It typically supports about 40–48 Logix connections depending on configuration.

Q5: Does it support redundant networks?
No — the 1756‑CNB is non‑redundant; redundant configurations use other modules.

Q6: What cable should be used for ControlNet with this module?
It uses 1786‑RG6 quad‑shield coaxial ControlNet cable.

Q7: What are the physical dimensions and weight?
Its approximate size is ~22.5 × 5.11 × 17.5 cm and it weighs about 0.26 kg.

Q8: Is the 1756‑CNB still produced by Rockwell Automation?
No — it has been discontinued as of December 31, 2024; the suggested replacement module is 1756‑CN2.

1756-CNB Allen Bradley

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