Allen-Bradley 1756-CPR2 ControlLogix ControlNet Redundant Cable

Allen-Bradley 1756-CPR2 ControlLogix ControlNet Cable Module

The module functions as a specialized communication link component engineered to interface high-speed ControlNet media lines inside an Allen-Bradley ControlLogix chassis. Occupying a single slot width, this intelligent media tap assembly supports deterministic 5 Mbps network networks, drawing 970 milliamps from the 5.1V DC backplane to manage redundant processing paths across distant physical locations using flexible 3-foot or 10-foot coaxial cabling configurations.

Technical Specifications

Quick Installation Guide

• Turn off all power feeding the target ControlLogix chassis rack before attempting to insert or remove communication components.
• Align the circuit board track constraints of the 0.28 kg 1756-CPR2 module with the selected single-slot location guides.
• Press the 0.28 kg assembly inward until the top and bottom structural locking tabs click firmly into place against the chassis frame.
• Attach the dedicated 3-foot or 10-foot ControlNet coaxial network connection links, securing the layout lines away from adjacent high-voltage AC cables to limit noise coupling.

Technical FAQs

Q1: Why does the 1756-CPR2 link require a continuous 970 mA current draw from the 5.1V backplane?
A1: The 970 mA load handles the high-frequency transceiver electronics needed to sustain a stable 5 Mbps transmission rate across long distances. This steady current consumption guarantees the signal amplitude remains clear and deterministic even when switching between primary and redundant network lines.

Q2: How does the compact 0.28 kg physical form factor affect layout constraints in dense chassis spaces?
A2: A low 0.28 kg physical mass matches its single-slot width profile, allowing it to easily mount into any available location on the backplane without causing structural line stress. This lightweight design helps the module withstand environmental vibrations while producing a moderate 17.4 BTU/hour thermal output.

Q3: Can standard off-the-shelf BNC cables substitute for the 3-foot or 10-foot ControlNet cables?
A3: No. The 1756-CPR2 module relies on specific characteristic impedance values found in certified 3-foot and 10-foot ControlNet cable variants. Relying on uncertified consumer coaxial lines can introduce impedance mismatches and data reflection anomalies, which degrade the 5 Mbps signal quality and trigger packet drops.