1756-CNB
ControlLogix Communication Module
Serial #:
This product has not been verified. Please {} to confirm authenticity.
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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-CN2
[https://www.rockwellautomation.com/en-us/products/details.1756-CN2.html]
Product at a glance
Replacement Available
Description
ControlNet Bridge Module (40-48 connections)
1756-CNB
ControlLogix Communication Module
Serial #:
This product has not been verified. Please {} to confirm authenticity.
register your product
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-CN2
[https://www.rockwellautomation.com/en-us/products/details.1756-CN2.html]
Product at a glance
Replacement Available
Description
ControlNet Bridge Module (40-48 connections)
Product Details
Look for SER on the product label to find your product series. To find information specific to your product, scan the QR code on the product label.
E
Overview
Electrical & Connectivity
General Features
Power & Electrical Characteristics
Compliance & Environment
Standards & Protection
Physical Characteristics
Mechanical
Drawings
Documents
Downloads
Certifications
Alternative Products
Technotes
| Unique Product Identifier |
1756-CNB
|
|---|---|
| UPC |
612598174072
|
| Standard Warranty Duration |
1 year See details |
| Country of Origin |
United States of America
|
| Communication |
ControlNet
|
|---|---|
| Interface |
1 ControlNet BNC
|
| Number Of Channels |
1
|
| Connections supported, max |
64 maximum
|
|---|---|
| ControlNet cable |
1786-RG6 quad shield RG6 coaxial cable
|
| ControlNet port |
1 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 |
False
|
| 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 |
0.26 kg
|
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| General | Publication |
|---|---|
| Selection Guide | 1756-SG001 |
| Product Profile | -- |
| Installation Instructions | 1756-IN604 |
| 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
Version:
Release notes
| Firmware Tools | Size | Notes | |
|---|---|---|---|
|
|
Comms Bundle 1756-CNB(R) | 126 MB | Release notes |
|
|
Comms Bundle 1756-CNB(R) | 126 MB | Release notes |
| Firmware | Size | Notes | |
|
|
Firmware for 1756-CNB V 11.004,E | 19.93 MB | Release notes |
Looking for more Downloads?
Find product downloads in Rockwell Automation Product Compatibility and Download Center.
Search PCDC
- UL Listed
- UL Listed Hazardous
- ODVA
- Australian RCM
- ATEX
- China CCC
- CE
- CSA Listed
- CSA Listed Hazardous
- Eurasion Economic Community
- Korean KC
- Bureau Veritas
- FM Approved Haz
- Registro Italiano Navale
- Safety
- IECEx Scheme
- MOROCCO DOC
This product was certified with the above certifications as of 2026-10-09. 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.
Looking for certification documents?
Explore certifications for this product and more in our comprehensive Literature Library.
Regulatory Information
| EU Importer Address |
Rockwell Automation N.V |
|---|---|
| EU Authorized Representative Address |
Rockwell Automation N.V |
Items Per Page:
| Technotes |
|---|
Looking for more Technotes?
Find questions and answers from Rockwell Automation technical experts for this product in our Knowledgebase.
Search Knowledgebase
Overview
| Unique Product Identifier |
1756-CNB
|
|---|---|
| UPC |
612598174072
|
| Standard Warranty Duration |
1 year See details |
| Country of Origin |
United States of America
|
Electrical & Connectivity
| Communication |
ControlNet
|
|---|---|
| Interface |
1 ControlNet BNC
|
| Number Of Channels |
1
|
| Connections supported, max |
64 maximum
|
|---|---|
| ControlNet cable |
1786-RG6 quad shield RG6 coaxial cable
|
| ControlNet port |
1 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 |
False
|
| 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 |
0.26 kg
|
Drawings
Click the Download CAD button below to view all file formats available for download.
Sign in to your Rockwell Automation account to view and download technical drawings.
Sign In
Documents
|
Selection Guide
General
1756-SG001 |
|
Product Profile
General
-- |
|
Installation Instructions
General
1756-IN604 |
|
Product Cutsheet
General
-- |
|
1756-td003_-en-e
Technical Data
1756-TD003 |
| General | Publication |
|---|---|
| Selection Guide | 1756-SG001 |
| Product Profile | -- |
| Installation Instructions | 1756-IN604 |
| 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
Version:
Release notes
| Firmware Tools | Size | Notes | |
|---|---|---|---|
|
|
Comms Bundle 1756-CNB(R) | 126 MB | Release notes |
|
|
Comms Bundle 1756-CNB(R) | 126 MB | Release notes |
| Firmware | Size | Notes | |
|
|
Firmware for 1756-CNB V 11.004,E | 19.93 MB | Release notes |
Looking for more Downloads?
Find product downloads in Rockwell Automation Product Compatibility and Download Center.
Search PCDC
Certifications
- UL Listed
- UL Listed Hazardous
- ODVA
- Australian RCM
- ATEX
- China CCC
- CE
- CSA Listed
- CSA Listed Hazardous
- Eurasion Economic Community
- Korean KC
- Bureau Veritas
- FM Approved Haz
- Registro Italiano Navale
- Safety
- IECEx Scheme
- MOROCCO DOC
This product was certified with the above certifications as of 2026-10-09. 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.
Looking for certification documents?
Explore certifications for this product and more in our comprehensive Literature Library.
Regulatory Information
| EU Importer Address |
Rockwell Automation N.V |
|---|---|
| EU Authorized Representative Address |
Rockwell Automation N.V |
Alternative Products
Items Per Page:
Technotes
| Technotes |
|---|
Looking for more Technotes?
Find questions and answers from Rockwell Automation technical experts for this product in our Knowledgebase.
Search Knowledgebase
Multiple countries of origin based on manufacturing location
ControlLogix Communication Module
1756-CNB
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