1756-CNBR

ControlLogix Communication Module

Name: ControlLogix Communication Module
Brand: Rockwell Automation
SKU: 1756-cnbr

Serial #:

Lifecycle status: Discontinued

Rockwell Automation announces that as of December 31, 2024, the ControlLogix Communication Module will be discontinued and no longer available for sale. Customers are encouraged to remove references to the affected product(s)

Discontinued Date: December 31, 2024 Replacement Category: Engineering Replacement Replacement Product: 1756-CN2R [https://www.rockwellautomation.com/en-us/products/details.1756-CN2R.html]

Product at a glance

Replacement Available

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Description

ControlNet Redundant Bridge Module (40-48 connections)

Lifecycle status: Discontinued

Discontinued Date: December 31, 2024 Replacement Category: Engineering Replacement Replacement Product: 1756-CN2R [https://www.rockwellautomation.com/en-us/products/details.1756-CN2R.html]

Product at a glance

Replacement Available

Repairable/Replaceable Repairable/Replaceable

Description

ControlNet Redundant Bridge Module (40-48 connections)

Unique Product Identifier	1756-CNBR
UPC	612598174089
Standard Warranty Duration	1 year See details
Country of Origin	United States of America

Communication	ControlNet
Connection Cables	1 m Tap
Interface	1

Connections supported, max	64 maximum
ControlNet cable	1786-RG6 quad shield RG6 coaxial cable
ControlNet port	2 ControlNet BNC
Current draw	970mA @ 5.1V DC, 1.7mA @ 24V DC
Enclosure type rating	None (open-style)
IO link master	False
Isolation voltage	Standard: 30V (continuous), basic insulation type, ControlNet network to, backplane, Redundant: 30V (continuous), basic insulation type, ControlNet A/B to, backplane, and ControlNet A to ControlNet B, USB to backplane and USB to ControlNet, No isolation b
Logix communication connections range	40...48
NAP cable	1786-CP
NAP port	1 NAP RJ45
Number of nodes, max	99 nodes
Power dissipation	5.1 W
Radio standard Bluetooth	False
Radio standard GPRS	False
Radio standard GSM	False
Radio standard UMTS	False
Radio standard Wi-Fi 802.11	False
Redundancy	True
Slot width	1
Supporting protocol for AS-Interface Safety at Work	False
Supporting protocol for ASI	False
Supporting protocol for CAN	False
Supporting protocol for Data-Highway	False
Supporting protocol for DeviceNet	False
Supporting protocol for DeviceNet Safety	False
Supporting protocol for EtherNet/IP	False
Supporting protocol for Foundation Fieldbus	False
Supporting protocol for INTERBUS	False
Supporting protocol for INTERBUS-Safety	False
Supporting protocol for KNX	False
Supporting protocol for LON	False
Supporting protocol for Modbus	False
Supporting protocol for PROFIBUS	False
Supporting protocol for PROFINET CBA	False
Supporting protocol for PROFINET IO	False
Supporting protocol for PROFIsafe	False
Supporting protocol for SERCOS	False
Supporting protocol for SUCONET	False
Supporting protocol for SafetyBUS p	False
Supporting protocol for TCP/IP	False
Supporting protocol for other bus systems	True
Thermal dissipation	17.4 btu/h
Transmission rate	5000 kbps
Wiring category	1 - on ControlNet ports, 3 - on NAP ports
With optical interface	False
With potential separation	False

Conducted RF immunity	10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz
EFT/B immunity	±3kV @ 5kHz on ControlNet ports
ESD immunity	6 kV contact discharges, 8 kV air discharges
Emissions	CISPR 11: Class A
Operating temperature	0 to 60 °C
Radiated RF immunity	10 V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz, 3 V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz
Relative humidity	5...95% noncondensing
Shock	Operating: 30 G, Non operating: 50 G
Storage temperature	-40 to 85 °C
Surge transient immunity	±2 kV line-earth (CM) on ControlNet ports
Surrounding air temperature, max	60 °C
Vibration	2 G @ 10...500 Hz

Mechanical

Module location	Chassis based, any slot
Weight, approx	0.293 kg

General	Publication
Installation Instructions	1756-IN604
Selection Guide	1756-SG001
Product Profile	--
Product Cutsheet	--

Technical Data	Publication
1756-td003_-en-e	1756-TD003

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Available Downloads

Comms Bundle 1756-CNB(R)
EDS files for 1756-CNBR (multi)
EDS files for ControlLogix Family (multi)

See All Downloads

This product was certified with the above certifications as of 2026-07-15. Products sold before or after this date might carry different certifications. Please review the product label to check for the certifications your specific product carries.

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Regulatory Information

EU Importer Address	Rockwell Automation N.V Pegasus Park De Kleetlaan 12A 1831 Diegem Belgium
EU Authorized Representative Address	Rockwell Automation N.V Pegasus Park De Kleetlaan 12A 1831 Diegem Belgium

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Technotes

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Overview

Unique Product Identifier	1756-CNBR
UPC	612598174089
Standard Warranty Duration	1 year See details
Country of Origin	United States of America

Electrical & Connectivity

Communication	ControlNet
Connection Cables	1 m Tap
Interface	1

Connections supported, max	64 maximum
ControlNet cable	1786-RG6 quad shield RG6 coaxial cable
ControlNet port	2 ControlNet BNC
Current draw	970mA @ 5.1V DC, 1.7mA @ 24V DC
Enclosure type rating	None (open-style)
IO link master	False
Isolation voltage	Standard: 30V (continuous), basic insulation type, ControlNet network to, backplane, Redundant: 30V (continuous), basic insulation type, ControlNet A/B to, backplane, and ControlNet A to ControlNet B, USB to backplane and USB to ControlNet, No isolation b
Logix communication connections range	40...48
NAP cable	1786-CP
NAP port	1 NAP RJ45
Number of nodes, max	99 nodes
Power dissipation	5.1 W
Radio standard Bluetooth	False
Radio standard GPRS	False
Radio standard GSM	False
Radio standard UMTS	False
Radio standard Wi-Fi 802.11	False
Redundancy	True
Slot width	1
Supporting protocol for AS-Interface Safety at Work	False
Supporting protocol for ASI	False
Supporting protocol for CAN	False
Supporting protocol for Data-Highway	False
Supporting protocol for DeviceNet	False
Supporting protocol for DeviceNet Safety	False
Supporting protocol for EtherNet/IP	False
Supporting protocol for Foundation Fieldbus	False
Supporting protocol for INTERBUS	False
Supporting protocol for INTERBUS-Safety	False
Supporting protocol for KNX	False
Supporting protocol for LON	False
Supporting protocol for Modbus	False
Supporting protocol for PROFIBUS	False
Supporting protocol for PROFINET CBA	False
Supporting protocol for PROFINET IO	False
Supporting protocol for PROFIsafe	False
Supporting protocol for SERCOS	False
Supporting protocol for SUCONET	False
Supporting protocol for SafetyBUS p	False
Supporting protocol for TCP/IP	False
Supporting protocol for other bus systems	True
Thermal dissipation	17.4 btu/h
Transmission rate	5000 kbps
Wiring category	1 - on ControlNet ports, 3 - on NAP ports
With optical interface	False
With potential separation	False

Compliance & Environment

Conducted RF immunity	10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz
EFT/B immunity	±3kV @ 5kHz on ControlNet ports
ESD immunity	6 kV contact discharges, 8 kV air discharges
Emissions	CISPR 11: Class A
Operating temperature	0 to 60 °C
Radiated RF immunity	10 V/m with 1 kHz sine-wave 80% AM from 80...2000 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz, 10 V/m with 200 Hz 50% Pulse 100% AM @ 1890 MHz, 3 V/m with 1 kHz sine-wave 80% AM from 2000...2700 MHz
Relative humidity	5...95% noncondensing
Shock	Operating: 30 G, Non operating: 50 G
Storage temperature	-40 to 85 °C
Surge transient immunity	±2 kV line-earth (CM) on ControlNet ports
Surrounding air temperature, max	60 °C
Vibration	2 G @ 10...500 Hz

Physical Characteristics

Mechanical

Module location	Chassis based, any slot
Weight, approx	0.293 kg

Drawings

Documents

Installation Instructions General
1756-IN604

Selection Guide General
1756-SG001

Product Profile General
--

Product Cutsheet General
--

1756-td003_-en-e Technical Data
1756-TD003

General	Publication
Installation Instructions	1756-IN604
Selection Guide	1756-SG001
Product Profile	--
Product Cutsheet	--
Technical Data	Publication
1756-td003_-en-e	1756-TD003

Looking for more documentation?

Find curated technical documentation for this product in the Technical Documentation Center, or search our full Literature Library.

Visit the Technical Documentation Center Search the Literature Library

Downloads

Available Downloads

Comms Bundle 1756-CNB(R)
EDS files for 1756-CNBR (multi)
EDS files for ControlLogix Family (multi)

See All Downloads

Certifications

${name=ATEX, link=http://literature.rockwellautomation.com/idc/groups/literature/documents/ct/plc-ct002_-en-e.pdf}$ ${name=China CCC, link=http://literature.rockwellautomation.com/idc/groups/literature/documents/ct/1756-ct147_-en-e.pdf}$ ${name=Australian RCM, link=http://literature.rockwellautomation.com/idc/groups/literature/documents/ct/1756-ct252_-en-e.pdf}$ ${name=IECEx Scheme, link=http://literature.rockwellautomation.com/idc/groups/literature/documents/ct/1756-ct231_-en-e.pdf}$ ${name=UKCA DOC, link=http://literature.rockwellautomation.com/idc/groups/literature/documents/ct/1756-ct236_-en-e.pdf}$ ${name=Eurasion Economic Community, link=http://literature.rockwellautomation.com/idc/groups/literature/documents/ct/1756-ct302_-ru-e.pdf}$

Looking for certification documents?
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Regulatory Information

EU Importer Address	Rockwell Automation N.V Pegasus Park De Kleetlaan 12A 1831 Diegem Belgium
EU Authorized Representative Address	Rockwell Automation N.V Pegasus Park De Kleetlaan 12A 1831 Diegem Belgium

Alternative Products

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Technotes

Technotes

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