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Allen-Bradley ControlLogix 1756 1756-CN2R ControlNet Redundant Interface Module | Original New

Allen-Bradley ControlLogix 1756 1756-CN2R ControlNet Redundant Interface Module | Original New

Allen-Bradley ControlLogix 1756 ControlNet Redundant Interface Module

Complete Model

1756-CN2R

Official Product Description

Allen-Bradley ControlLogix 1756-CN2R redundant ControlNet communication interface with two BNC ports, 5 Mbps communication, 128 Logix connections and support for as many as 99 network nodes.

CORE FEATURE: Redundant ControlNet interface with 128 Logix communication connections and two ControlNet BNC ports.

LEAD TIME: In stock

WARRANTY: 1 year

Email Inquiry [email protected]

WhatsApp +86 18159889985

Appurtenance:

allen bradley controllogix 1756 1756 cn2r controlnet redundant interface module-1

Overview
Technical Data
Inquiry
Features
Interfaces
Installation
Environment
FAQ
Recommend Models
Recommended Products

Product Overview

1756-CN2R is an Allen-Bradley ControlLogix 1756 redundant ControlNet communication interface module for chassis-based industrial control systems.

Rockwell Automation specifies a 5 Mbps ControlNet communication rate, 128 Logix communication connections, as many as 131 supported connections and as many as 99 network nodes.

The module provides two ControlNet BNC ports for redundant media, a full-speed USB port for temporary local programming and one-slot installation in a compatible 1756 chassis.

Technical Data

Complete model	1756-CN2R
Brand	Allen-Bradley / Rockwell Automation
Product family	ControlLogix 1756
Product type	Redundant ControlNet communication interface module
Lifecycle status	Active Mature
Configuration	Redundant
Communication network	ControlNet
Communication rate	5 Mbps
Logix communication connections	128
Connections supported	131 maximum, including three reserved for redundant control
Network nodes	99 maximum
ControlNet ports	Two ControlNet BNC ports
ControlNet cable	1786-RG6 quad-shield RG6 coaxial cable
USB port	USB full speed, 12 Mbps, for temporary local programming
Current draw at 5.1 VDC	1300 mA
Current draw at 24 VDC	3 mA
Power dissipation	6.7 W
Thermal dissipation	22.9 BTU/hr
Isolation voltage	30 V continuous, basic insulation; type tested at 500 VAC for 60 seconds
Dimensions	Numeric dimensions are not stated in official publication 1756-TD003; one-slot chassis module, official drawing 32517-M
Weight	Approximately 0.293 kg (0.64 lb)
Slot width	One ControlLogix chassis slot
Module location	Chassis-based, any slot
Compatible chassis	1756-A4, 1756-A7, 1756-A10, 1756-A13 and 1756-A17
Enclosure type	None, open-style equipment
Wiring category	Category 1 on ControlNet ports; Category 3 on USB ports
Operating temperature	0 to 60 degrees C
Storage temperature	-40 to +85 degrees C
Relative humidity	5 to 95 percent, noncondensing
Vibration	2 g at 10-500 Hz
Shock	30 g operating and 30 g nonoperating
Certifications	cULus, CSA, CE, RCM, KC, ATEX, IECEx, FM, UKCA, UKEx, ABS, RINA, ODVA, EAC, Morocco and CCC when marked
Official sources	Rockwell Automation 1756-CN2R product page; publication 1756-TD003Q-EN-E pages 25-29; installation publication 1756-IN074

Inquiry

CONTACT

STELLA

Email Inquiry [email protected]

WhatsApp +86 18159889985

Features

Redundant ControlNet media

Two BNC ports support redundant ControlNet network media for improved network availability.

Connection capacity

The module supports 128 standard Logix communication connections plus three connections reserved for redundant control.

Deterministic communication

ControlNet provides repeatable transfer of critical control data at a published communication rate of 5 Mbps.

Local programming access

A full-speed 12 Mbps USB port is provided for temporary local programming and commissioning.

Interfaces

ControlNet A and B	Connect redundant ControlNet media to the two BNC ports using the specified 1786-RG6 quad-shield RG6 coaxial cable and approved taps.
USB connection	Use the USB port only for temporary local programming; Rockwell Automation does not specify it for permanent installation or hazardous-location use.
Backplane interface	Install the module in one slot of a compatible 1756 chassis; it draws 1300 mA at 5.1 VDC and 3 mA at 24 VDC from the backplane.
Network addressing	Set the ControlNet node address before installation and verify that it is unique on the network.

Installation

01 - Verify the catalog number

Match 1756-CN2R on the quotation, module label, packaging and Rockwell Automation product record before installation.

02 - Confirm chassis and power

Use a compatible 1756 chassis, reserve one slot and verify that the backplane power budget supports the published current draw.

03 - Set the network address

Set the ControlNet node address with the module switches before inserting the module into the chassis.

04 - Install the module

Insert the module into the selected chassis slot and secure it according to publication 1756-IN074.

05 - Connect redundant media

Attach the ControlNet taps to channels A and B, maintain the required cable routing and verify network status indicators after startup.

Environment

Operating temperature

0 to 60 degrees C.

Storage temperature

-40 to +85 degrees C.

Relative humidity

5 to 95 percent, noncondensing.

Mechanical endurance

2 g vibration at 10-500 Hz and 30 g shock in operating and nonoperating conditions.

EMC performance

Published immunity includes ESD, radiated RF, EFT/B, surge and conducted RF tests for industrial environments.

Protection

Open-style equipment; install it in a suitable industrial enclosure and observe the applicable hazardous-location instructions.

FAQ

Q1. How can the exact quoted 1756-CN2R be verified?

Match the complete 1756-CN2R catalog number on the quotation, module label and packaging. Confirm the redundant configuration, two ControlNet BNC ports, 128 Logix connections, 5 Mbps rate and one-slot ControlLogix chassis format.

Q2. How can New, Used or Refurbished condition be distinguished?

Request date-marked photos of the full product label, serial and series markings, both BNC connectors, USB port, status display, backplane connector and housing. Check for connector wear, scratched network ports, altered labels or residue from previous chassis installation.

Q3. How should supplier legality and reliability be checked?

Verify the supplier legal entity, registered address, invoice details, payment beneficiary and traceable sales contact. The written offer must identify Allen-Bradley, 1756-CN2R, condition, quantity, series and included accessories.

Q4. Which specifications must engineering confirm before purchase?

Confirm the required ControlNet topology, redundant A/B media, 5 Mbps rate, 128 Logix connections, 99-node limit, firmware and series compatibility, chassis slot, backplane power, 1786-RG6 cable system and environmental ratings.

Q5. What physical evidence should be requested before payment?

Ask for one date-marked photo set showing the complete 1756-CN2R label, serial and series markings, both ControlNet BNC ports, USB port, front indicators, backplane connector, housing condition, seals and packaging.

Q6. Can 1756-CN2, 1756-CNBR or 1756-CN2RXT replace 1756-CN2R?

Not automatically. 1756-CN2 has one ControlNet BNC port and is not the redundant-media configuration, 1756-CNBR has lower connection capacity, and 1756-CN2RXT is the extended-temperature variant. Confirm media redundancy, connection capacity, firmware, series, temperature range and system approvals before substitution.

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