Allen Bradley 1756-CNB ControlNet Interface Module

The AB 1756-CNB is a ControlLogix communication bridge module designed for ControlNet network interfacing. It allows a ControlLogix chassis to send and receive data over a ControlNet network, functioning as a central bridge between controllers, remote I/O, and other networked devices in distributed industrial systems.

Equipped with a single BNC connector for non-redundant media and one NAP port (RJ-45 8-pin shielded), this module enables flexible integration into standard ControlNet architectures. The 1756-CNB operates seamlessly with the Logix5000 family, supporting scheduled and unscheduled messaging and providing deterministic control in time-critical applications.

Technical Specifications

Model: 1756CNB
Series: ControlLogix
Type: ControlNet Bridge Communication Module
Media Type: Single Media (Non-Redundant)
Connectors: 1 x BNC, 1 x NAP (RJ-45, 8-pin shielded)
Enclosure Type: Open (for chassis installation)
Chassis Compatibility: ControlLogix
Slot Occupancy: 1 Slot
Application: ControlNet communication for distributed I/O, peer-to-peer messaging, controller bridging

Electrical Specifications

Backplane Current Draw (5.1V): 350 mA
Backplane Current Draw (24V): 0 mA
Communication Rate: 5 Mbps (ControlNet Standard)
Media Support: Coaxial cable for BNC; twisted pair for NAP
ControlNet Scheduling: Supported
Messaging Types: Scheduled and Unscheduled
Maximum I/O Connections: 128
Network Nodes Supported: Up to 99
Status Indicators: Module, Network, Node, OK

Mechanical Specifications

Mounting Type: DIN rail or chassis slot
Width: Standard 1-slot ControlLogix module
Height: Standard ControlLogix chassis form factor
Depth: Conforms to chassis depth
Interface Type: Front panel BNC and NAP connectors
Hot-Swappable: Yes
Module Keying: Electronically keyed

Environmental Specifications

Operating Temperature: 0…60 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5%…95% non-condensing
Vibration/Shock Tolerance: IEC 60068 compliant
Certifications: CE, UL, cUL, C-Tick
Enclosure Rating: None (installed in chassis)
Application in Commercial/Residential Areas: Permitted

Compliance & Communication

Supported Protocols: ControlNet
EtherNet/IP: Not supported
MODBUS / TCP/IP: Not supported
RS-232 / RS-485 / USB: Not supported
Redundant Media: No
ControlNet NAP Port: Included (RJ-45)
ControlNet BNC Port: Included
Integrated Switching: No
Chassis Backplane Communication: Yes

Key Features & Benefits

✅ ControlNet Bridging – Enables real-time communication between Logix controllers and distributed nodes over ControlNet

✅ Dual Port Flexibility – Includes BNC for coaxial media and NAP for diagnostics or programming access

✅ High Node Capacity – Supports up to 99 ControlNet nodes, ideal for large automation networks

✅ Hot-Swappable Design – Insert or remove the module without powering down the chassis

✅ Compact & Reliable – Proven performance in time-critical and deterministic automation environments

✅ ControlLogix Integration – Fully compatible with Rockwell’s ControlLogix platform and Studio 5000 software

📦 Order the Allen Bradley 1756-CNB from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 1756-CNB prices. With original packaging and fast delivery options, this ControlNet bridge module is the ideal solution for reliable, high-speed communication in your distributed industrial systems.

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