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Allen Bradley
1756-CN2R

ControlLogix Communication Module

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Allen-Bradley 1756-CN2R product image
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Allen Bradley
Lifecycle status: Active Mature
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Lifecycle status: Active Mature
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Technical Specifications
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Documents
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Certifications
Technotes
Communication ControlNet
Connection Cables 1 m Tap
Number Of Channels 2
With optical interface False
Supporting protocol for TCP/IP False
Supporting protocol for DeviceNet False
Supporting protocol for other bus systems True
Redundancy True
IO link master False
Supporting protocol for DeviceNet Safety False
Supporting protocol for EtherNet/IP False
Transmission rate 5000 kbps
Logix communication connections 128
Power dissipation 6.7 W
Thermal dissipation 22.9 btu/h
ControlNet port 2 ControlNet BNC
Enclosure type rating None (open-style)
Number of nodes, max 99 nodes
Current draw 1300mA @ 5.1V DC, 3mA @ 24V DC
ControlNet cable 1786-RG6 quad shield RG6 coaxial cable
Wiring category 1 - on ControlNet ports, 3 - on USB ports
Connections supported, max 131 maximum
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
Supporting protocol for LON False
Supporting protocol for ASI False
Supporting protocol for PROFIBUS False
Supporting protocol for CAN False
Supporting protocol for INTERBUS False
Supporting protocol for KNX False
Supporting protocol for Modbus False
Supporting protocol for Data-Highway False
Supporting protocol for SUCONET False
With potential separation False
Supporting protocol for SERCOS False
Supporting protocol for INTERBUS-Safety False
Radio standard Bluetooth False
Radio standard Wi-Fi 802.11 False
Supporting protocol for AS-Interface Safety at Work False
Supporting protocol for Foundation Fieldbus False
Supporting protocol for PROFINET CBA False
Supporting protocol for PROFINET IO False
Supporting protocol for PROFIsafe False
Supporting protocol for SafetyBUS p False
Radio standard GPRS False
Radio standard GSM False
Radio standard UMTS False
Slot width 1
Surrounding air temperature, max 60 °C
Storage temperature -40 to 85 °C
Emissions CISPR 11: Class A
Vibration 2 G @ 10...500 Hz
ESD immunity 6 kV contact discharges, 8 kV air discharges
EFT/B immunity ±3kV @ 5kHz on ControlNet ports
Relative humidity 5...95% noncondensing
Shock Operating: 30 G, Nonoperating: 30 G
Conducted RF immunity 10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz
Surge transient immunity ±2 kV line-earth (CM) on ControlNet ports
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
North American temperature code T4A
IEC temperature code T4
Weight, approx 0.293 kg
Module location Chassis based, any slot
Drawings
3-Dimensional STEP model (STP) Download (ZIP)
Dimensional Drawing in 3D (PDF) Download (PDF)
Product Drawing Drawing (DXF)
Drawings
3-Dimensional STEP model (STP) Download (ZIP)
Dimensional Drawing in 3D (PDF) Download (PDF)
Product Drawing Drawing (DXF)
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Type Resource Publication
General Product Profile --
General Product Cutsheet --
General Selection Guide 1756-SG001
General Installation Instructions 1756-IN607
Technical Data 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.
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Available Downloads
  • Firmware for 1756-CN2R v25.006
See All Downloads Chevron RightChevron Right
China CCC ATEX Australian RCM IECEx Scheme Korean KC UL Listed
  • China CCC
  • Safety
  • ATEX
  • American Bureau of Shippin
  • CE
  • Australian RCM
  • IECEx Scheme
  • CSA Listed
  • FM Approved Haz
  • Korean KC
  • Registro Italiano Navale
  • ODVA
  • UL Listed
  • UL Listed Hazardous

This product was certified with the above certifications as of 2025-07-27. 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 more Technotes?
Find questions and answers from Rockwell Automation technical experts for this product in our Knowledgebase.
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Technical Specifications
Communication ControlNet
Connection Cables 1 m Tap
Number Of Channels 2
With optical interface False
Supporting protocol for TCP/IP False
Supporting protocol for DeviceNet False
Supporting protocol for other bus systems True
Redundancy True
IO link master False
Supporting protocol for DeviceNet Safety False
Supporting protocol for EtherNet/IP False
Transmission rate 5000 kbps
Logix communication connections 128
Power dissipation 6.7 W
Thermal dissipation 22.9 btu/h
ControlNet port 2 ControlNet BNC
Enclosure type rating None (open-style)
Number of nodes, max 99 nodes
Current draw 1300mA @ 5.1V DC, 3mA @ 24V DC
ControlNet cable 1786-RG6 quad shield RG6 coaxial cable
Wiring category 1 - on ControlNet ports, 3 - on USB ports
Connections supported, max 131 maximum
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
Supporting protocol for LON False
Supporting protocol for ASI False
Supporting protocol for PROFIBUS False
Supporting protocol for CAN False
Supporting protocol for INTERBUS False
Supporting protocol for KNX False
Supporting protocol for Modbus False
Supporting protocol for Data-Highway False
Supporting protocol for SUCONET False
With potential separation False
Supporting protocol for SERCOS False
Supporting protocol for INTERBUS-Safety False
Radio standard Bluetooth False
Radio standard Wi-Fi 802.11 False
Supporting protocol for AS-Interface Safety at Work False
Supporting protocol for Foundation Fieldbus False
Supporting protocol for PROFINET CBA False
Supporting protocol for PROFINET IO False
Supporting protocol for PROFIsafe False
Supporting protocol for SafetyBUS p False
Radio standard GPRS False
Radio standard GSM False
Radio standard UMTS False
Slot width 1
Surrounding air temperature, max 60 °C
Storage temperature -40 to 85 °C
Emissions CISPR 11: Class A
Vibration 2 G @ 10...500 Hz
ESD immunity 6 kV contact discharges, 8 kV air discharges
EFT/B immunity ±3kV @ 5kHz on ControlNet ports
Relative humidity 5...95% noncondensing
Shock Operating: 30 G, Nonoperating: 30 G
Conducted RF immunity 10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz
Surge transient immunity ±2 kV line-earth (CM) on ControlNet ports
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
North American temperature code T4A
IEC temperature code T4
Weight, approx 0.293 kg
Module location Chassis based, any slot
Drawings
Drawings
3-Dimensional STEP model (STP) Download (ZIP)
Dimensional Drawing in 3D (PDF) Download (PDF)
Product Drawing Drawing (DXF)
Drawings
3-Dimensional STEP model (STP) Download (ZIP)
Dimensional Drawing in 3D (PDF) Download (PDF)
Product Drawing Drawing (DXF)
Sign in to your Rockwell Automation account to view and download technical drawings.
Sign In
Documents
Product Profile General
--
Product Cutsheet General
--
Selection Guide General
1756-SG001
Installation Instructions General
1756-IN607
1756-td003_-en-e Technical Data
1756-TD003
Type Resource Publication
General Product Profile --
General Product Cutsheet --
General Selection Guide 1756-SG001
General Installation Instructions 1756-IN607
Technical Data 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 Chevron RightChevron Right Search the Literature Library Chevron RightChevron Right
Downloads
Available Downloads
  • Firmware for 1756-CN2R v25.006
See All Downloads Chevron RightChevron Right
Certifications
China CCC ATEX Australian RCM IECEx Scheme Korean KC UL Listed
  • China CCC
  • Safety
  • ATEX
  • American Bureau of Shippin
  • CE
  • Australian RCM
  • IECEx Scheme
  • CSA Listed
  • FM Approved Haz
  • Korean KC
  • Registro Italiano Navale
  • ODVA
  • UL Listed
  • UL Listed Hazardous

This product was certified with the above certifications as of 2025-07-27. 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.

Technotes
Looking for more Technotes?
Find questions and answers from Rockwell Automation technical experts for this product in our Knowledgebase.
Search Knowledgebase Chevron RightChevron Right
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