Allen Bradley 1756-CN2 ControlNet Interface Module

The AB 1756-CN2 is a high-speed ControlNet communication module designed for ControlLogix systems, enabling deterministic, scheduled data transfer between controllers and distributed I/O devices. It supports up to 128 Logix connections and accommodates up to 100 ControlNet nodes, making it ideal for real-time control in large, time-critical industrial applications.

As part of the ControlLogix platform, the 1756-CN2 fits into any standard 1756 chassis and communicates across the backplane for seamless integration with Logix controllers. Its robust design, reliable data transfer, and modular flexibility make it the preferred choice for systems requiring synchronized motion, process, or discrete control over ControlNet.

Technical Specifications

Model: 1756CN2
Series: ControlLogix
Type: ControlNet Communication Module
Logix Connections: 128
Max Network Nodes: 100 ControlNet devices
Mounting Type: 1756 Chassis
Application: Real-time control networking for distributed I/O, drives, motion, and controllers

Electrical & Interface Specifications

Communication Protocol: ControlNet
Network Interface: BNC (Coaxial) or Fiber (with adapters)
Max Communication Speed: 5 Mbps (standard for ControlNet)
Backplane Current Draw: Approx. 500 mA @ 5.1V DC
ControlLogix Backplane Communication: Supported
Redundancy Support: No
Connector Type: ControlNet BNC port
Bus Interface: Backplane connection via chassis slot

Mechanical Specifications

Width: 35 mm
Height: 145 mm
Depth: 140 mm
Mounting: ControlLogix 1756 chassis slot
Housing: Industrial-grade enclosure
Weight: Approx. 300 g
Form Factor: Modular slot-based design

Environmental Specifications

IP Rating: IP20 (when installed)
Operating Temperature: 0…60 °C
Storage Temperature: -40…85 °C
Humidity: 5% to 95% non-condensing
Shock Resistance: 30g
Vibration Tolerance: 2g from 10–500 Hz
Certifications: CE, cULus, RoHS
Explosion Safety (Gas/Dust): Not rated

Compliance & Communication

ControlNet Supported: Yes
Data Highway / DeviceNet / EtherNet/IP / MODBUS / PROFIBUS: Not supported
Other Bus Protocols: Supported via ControlNet infrastructure
RSNetWorx for ControlNet: Fully supported for configuration
Diagnostic Features: Network status LEDs, module status indicators
Time-Critical Data Transfer: Yes – deterministic scheduled data handling
Network Redundancy: Not supported on this model (use 1756-CN2R for redundancy)

Key Features & Benefits

✅ High-Capacity Networking – Supports up to 128 Logix connections and 100 ControlNet devices

✅ Deterministic Performance – Optimized for real-time control and time-sensitive data

✅ Chassis-Integrated Design – Plugs directly into ControlLogix racks for quick deployment

✅ Studio 5000 Compatible – Easily configured and monitored via RSNetWorx and Studio 5000

✅ Compact Form Factor – Slim 35 mm width saves chassis space

✅ Proven ControlNet Backbone – Stable and scalable for motion, process, and discrete systems

📦 Order the Allen Bradley 1756-CN2 from Drive Outlet Megastore

At Drive Outlet Megastore we offer unbeatable Allen Bradley 1756-CN2 prices. Though currently out of stock, this model can be sourced quickly—contact our team to secure availability and lead time updates.

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