1756-CNB
ControlLogix Communication Module
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
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
| Communication | ControlNet |
|---|---|
| Interface | 1 ControlNet BNC |
| Number Of Channels | 1 |
| With optical interface | False |
|---|---|
| Supporting protocol for TCP/IP | False |
| Supporting protocol for DeviceNet | False |
| Supporting protocol for other bus systems | True |
| Redundancy | False |
| IO link master | False |
| Supporting protocol for DeviceNet Safety | False |
| Supporting protocol for EtherNet/IP | False |
| Transmission rate | 5000 kbps |
| Power dissipation | 5.1 W |
| Thermal dissipation | 17.4 btu/h |
| ControlNet port | 1 ControlNet BNC |
| Enclosure type rating | None (open-style) |
| Number of nodes, max | 99 nodes |
| Current draw | 970mA @ 5.1V DC, 1.7mA @ 24V DC |
| ControlNet cable | 1786-RG6 quad shield RG6 coaxial cable |
| Wiring category | 1 - on ControlNet ports, 3 - on NAP ports |
| Connections supported, max | 64 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 |
| Logix communication connections range | 40...48 |
| NAP cable | 1786-CP |
| NAP port | 1 NAP RJ45 |
| 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, Non operating: 50 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 | 0.26 kg |
|---|---|
| Module location | Chassis based, any slot |
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| Type | Resource | Publication |
|---|---|---|
| General | Product Cutsheet | -- |
| General | Installation Instructions | 1756-IN604 |
| General | Selection Guide | 1756-SG001 |
| General | Product Profile | -- |
| 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
- Comms Bundle 1756-CNB(R)
- EDS files for 1756-CNB
- Firmware for 1756-CNBR V 11.005,E
- 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
This product was certified with the above certifications as of 2025-06-16. 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 |
|---|---|
| Interface | 1 ControlNet BNC |
| Number Of Channels | 1 |
| With optical interface | False |
|---|---|
| Supporting protocol for TCP/IP | False |
| Supporting protocol for DeviceNet | False |
| Supporting protocol for other bus systems | True |
| Redundancy | False |
| IO link master | False |
| Supporting protocol for DeviceNet Safety | False |
| Supporting protocol for EtherNet/IP | False |
| Transmission rate | 5000 kbps |
| Power dissipation | 5.1 W |
| Thermal dissipation | 17.4 btu/h |
| ControlNet port | 1 ControlNet BNC |
| Enclosure type rating | None (open-style) |
| Number of nodes, max | 99 nodes |
| Current draw | 970mA @ 5.1V DC, 1.7mA @ 24V DC |
| ControlNet cable | 1786-RG6 quad shield RG6 coaxial cable |
| Wiring category | 1 - on ControlNet ports, 3 - on NAP ports |
| Connections supported, max | 64 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 |
| Logix communication connections range | 40...48 |
| NAP cable | 1786-CP |
| NAP port | 1 NAP RJ45 |
| 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, Non operating: 50 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 | 0.26 kg |
|---|---|
| Module location | Chassis based, any slot |
Drawings
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Documents
|
Product Cutsheet
General
-- |
|
Installation Instructions
General
1756-IN604 |
|
Selection Guide
General
1756-SG001 |
|
Product Profile
General
-- |
|
1756-td003_-en-e
Technical Data
1756-TD003 |
| Type | Resource | Publication |
|---|---|---|
| General | Product Cutsheet | -- |
| General | Installation Instructions | 1756-IN604 |
| General | Selection Guide | 1756-SG001 |
| General | Product Profile | -- |
| 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
Search the Literature Library
Downloads
Available Downloads
- Comms Bundle 1756-CNB(R)
- EDS files for 1756-CNB
- Firmware for 1756-CNBR V 11.005,E
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
This product was certified with the above certifications as of 2025-06-16. 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
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