1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
    1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
    1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module
1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module

1756-CNB | Allen-Bradley ControlLogix ControlNet Bridge Module

Part #: 1756-CNB Manufactured by: Allen-Bradley
Regular price
$289.00
Sale price
$289.00
Regular price
2 in Stock
Condition: New-Surplus Original Box
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Product Overview
The 1756-CNB is a ControlNet bridge module that manages scheduled I/O data and unscheduled message routing between Control...  Read more
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Product Description P/N: 1756-CNB

Description / Specifications

Description 

The Allen-Bradley 1756-CNB is a ControlLogix ControlNet Bridge module used for connecting ControlLogix racks to a ControlNet network. It provides reliable data exchange with one BNC connector for non-redundant media and one RJ-45 (NAP) interface.

 

 

Technical Specifications 

Brand Allen-Bradley
Series ControlLogix
Part Number 1756-CNB
Manufacturer Rockwell Automation
Module Type Bridge Module
Maximum Nodes 99
Maximum Connections 64
ControlNet Communication Rate 5 megabits-second
Configuration Standard
Input Current 970 milliamps at 5.1 Volts DC, 1.7 milliamps at 24 Volts DC
Thermal Dissipation 17.4 BTU per Hour
Power Dissipation 5.1 Watts
Slot width 1

  

 

Information About 1756-CNB

The 1756-CNB is part of the Allen-Bradley ControlLogix series, designed to bridge communication between the ControlLogix backplane and a ControlNet network. It operates at a ControlNet communication rate of 5 Mbps and supports up to 99 nodes and 64 bidirectional connections, which can include both scheduled and unscheduled data. This module is suitable for applications requiring up to 40–48 Logix connections per communication module and ensures seamless routing of I/O and messaging data. Featuring one BNC connector and one RJ-45 NAP port, it simplifies network integration and setup through selectable node addresses from 01 to 99. With a compact 1-slot width, a current draw of 970 mA at 5.1 VDC, and a thermal dissipation of 17.4 BTU/hr, the module delivers efficient operation while maintaining system reliability.

Key Features:

  • Module Type: ControlLogix ControlNet Bridge module for ControlNet integration.
  • Communication Speed: Operates at 5 Mbps for high-speed data transfer.
  • Node Capacity: Supports up to 99 nodes for scalable network setups.
  • Connection Capacity: Handles up to 64 bidirectional connections (scheduled and unscheduled).
  • Ports: Includes 1 BNC connector for non-redundant media and 1 RJ-45 NAP port.
  • Message Handling: Provides up to 20 buffers for unconnected messages.
  • Current Draw: 970 mA at 5.1 VDC and 1.7 mA at 24 VDC for power-efficient use.
  • Dissipation: Rated at 5.1 W power dissipation and 17.4 BTU/hr thermal output.
  • Slot Requirement: Occupies a single slot in a ControlLogix chassis for compact installation.
  • Configuration: Standard non-redundant operation with selectable node addresses from 01–99.

The 1756-CNB delivers the reliability and scalability required for ControlNet communication in ControlLogix-based automation systems.


 

Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

Frequently Asked Questions about 1756-CNB
Question: What is the function of the 1756-CNB module?
Date Update:28/05/2025
Answer:

The Allen-Bradley 1756-CNB is a ControlNet bridge module that connects a ControlLogix chassis to a ControlNet network. It facilitates communication between the controller and distributed I/O, other ControlNet nodes, or HMI/SCADA systems. The module supports both scheduled and unscheduled messaging and can route control and diagnostic data efficiently. It plays a vital role in large, distributed automation systems where real-time control is needed.

Question: How many devices or nodes can be connected using the 1756-CNB?
Date Update:28/05/2025
Answer:

The 1756-CNB module supports up to 99 nodes on the ControlNet network. It can manage up to 64 bidirectional communication connections, including both scheduled and unscheduled traffic. Additional modules can be used in the same chassis if more connections are needed. These capabilities make it ideal for complex network architectures.

Question: What diagnostic features are built into the 1756-CNB?
Date Update:28/05/2025
Answer:

The module supports both software and hardware diagnostics. It displays connection status, node address, and module name on its front panel. Users can also view error counters and network status through the programming software to aid in troubleshooting and performance monitoring.

Question: How is the module configured and installed?
Date Update:28/05/2025
Answer:

The 1756-CNB is a single-slot module that fits into any ControlLogix chassis. Configuration includes setting the node address via DIP switches and defining communication parameters using Studio 5000 or RSNetWorx software. It is important to verify path routing for accurate communication between devices.

Question: Is the 1756-CNB still in production?
Date Update:28/05/2025
Answer:

No, according to Rockwell Automation, the 1756-CNB will be discontinued on December 31, 2024. Customers are advised to migrate to the 1756-CN2, which is the recommended engineering replacement and offers enhanced capabilities.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1756-CNB is a ControlLogix ControlNet Bridge module used for connecting ControlLogix racks to a ControlNet network. It provides reliable data exchange with one BNC connector for non-redundant media and one RJ-45 (NAP) interface.

 

 

Technical Specifications 

Brand Allen-Bradley
Series ControlLogix
Part Number 1756-CNB
Manufacturer Rockwell Automation
Module Type Bridge Module
Maximum Nodes 99
Maximum Connections 64
ControlNet Communication Rate 5 megabits-second
Configuration Standard
Input Current 970 milliamps at 5.1 Volts DC, 1.7 milliamps at 24 Volts DC
Thermal Dissipation 17.4 BTU per Hour
Power Dissipation 5.1 Watts
Slot width 1

  

 

Information About 1756-CNB

The 1756-CNB is part of the Allen-Bradley ControlLogix series, designed to bridge communication between the ControlLogix backplane and a ControlNet network. It operates at a ControlNet communication rate of 5 Mbps and supports up to 99 nodes and 64 bidirectional connections, which can include both scheduled and unscheduled data. This module is suitable for applications requiring up to 40–48 Logix connections per communication module and ensures seamless routing of I/O and messaging data. Featuring one BNC connector and one RJ-45 NAP port, it simplifies network integration and setup through selectable node addresses from 01 to 99. With a compact 1-slot width, a current draw of 970 mA at 5.1 VDC, and a thermal dissipation of 17.4 BTU/hr, the module delivers efficient operation while maintaining system reliability.

Key Features:

  • Module Type: ControlLogix ControlNet Bridge module for ControlNet integration.
  • Communication Speed: Operates at 5 Mbps for high-speed data transfer.
  • Node Capacity: Supports up to 99 nodes for scalable network setups.
  • Connection Capacity: Handles up to 64 bidirectional connections (scheduled and unscheduled).
  • Ports: Includes 1 BNC connector for non-redundant media and 1 RJ-45 NAP port.
  • Message Handling: Provides up to 20 buffers for unconnected messages.
  • Current Draw: 970 mA at 5.1 VDC and 1.7 mA at 24 VDC for power-efficient use.
  • Dissipation: Rated at 5.1 W power dissipation and 17.4 BTU/hr thermal output.
  • Slot Requirement: Occupies a single slot in a ControlLogix chassis for compact installation.
  • Configuration: Standard non-redundant operation with selectable node addresses from 01–99.

The 1756-CNB delivers the reliability and scalability required for ControlNet communication in ControlLogix-based automation systems.


 

Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.

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