The 1756-CN2RXT is a ControlNet Redundant Communication Module from Rockwell Automation's Allen-Bradley ControlLogix series, designed for industrial automation control systems. It enables high-reliability data transmission and real-time control network communication.

I. Technical Specifications and Key Performance Metrics

1. Basic Parameters

Parameter：Specification

Model Number：1756-CN2RXT

Module Type：ControlNet Redundant Communication Module (Dual Channel)

Protocol Support：ControlNet (Compliant with IEC 61158 Standard)

Data Rate：5 Mbps (Configurable)

Network Topology：Bus, Star, Tree, Redundant Ring (DLR)

Maximum Nodes：99 (Including PLCs, I/O, HMIs, etc.)

Redundancy Switch Time < 100 ms (Automatic failover)

2. Electrical & Mechanical Specifications

Parameter：Specification

Power Requirements：Powered via ControlLogix Backplane (5V DC)

Power Consumption：1.2W (Typical)

Operating Temp.：-20°C to +70°C (Extended Temperature Range for Harsh Environments)

Storage Temp.：-40°C to +85°C

Humidity Range：5% to 95% (Non-Condensing)

Vibration Resistance：5g (Per IEC 60068-2-6)

Shock Resistance：30g (Per IEC 60068-2-27)

Enclosure Rating：IP20 (Requires Installation in Control Panel)

Weight：300g

3. Communication Performance

Parameter：Specification

Data Throughput：Up to 5 Mbps (Segment-Optimizable)

Network Update Time (NUT)：Configurable (Default: 2ms~100ms)

Max Cable Length：Coaxial (RG-6): 1000m (with Repeaters) / Fiber: 3000m

Connector Type：BNC (Coaxial) / ST or SC (Fiber Optic Optional)

Diagnostics：Real-time Network Monitoring, Node Communication Statistics, Fault Logging

II. Functional Characteristics and Industry-Specific Applications

Functional Features：

1. ControlNet Redundant Communication

• Supports ControlNet protocol (compliant with IEC 61158) for real-time control networks
• Dual-channel redundancy (RXT = Redundant Extended Temperature) ensures high availability
• Network recovery time <100ms, suitable for critical industrial applications

2. High-Performance Data Exchange

• 5Mbps transmission speed for medium-scale industrial networks
• Supports up to 99 nodes (including PLCs, I/O modules, HMIs, etc.)
• Enables scheduled and unscheduled communication

3. Wide Operating Temperature Range

• Operating temperature: -20°C to +70°C (for harsh industrial environments)
• Vibration-resistant and EMI-protected, certified for CE, UL, ATEX, etc.

4. Plug-and-Play Integration

• Compatible with ControlLogix 5570/5580 series PLCs
• Configurable via Studio 5000 Logix Designer
• Seamless integration with PlantPAx DCS systems

Industry Applications：

• Oil & Gas: Offshore drilling platform control (redundant comms for safety)
• Power Systems: Substation automation (high noise immunity)
• Automotive Manufacturing: Welding/painting lines (real-time control needs)
• Food & Beverage: Filling line control (wide temp range for cold storage)

Typical Applications：

• Mission-Critical Systems: Power Substations, Oil Pipeline SCADA
• Harsh Environments: Mining Equipment, Polar Research Devices
• Real-Time Control: Automotive Welding Lines, Semiconductor Wafer Handling

III.  Competitive Advantage and Market Positioning Analysis

Advantages：

Better suited for extreme temperatures & high vibration than standard CN2R

More flexible redundancy vs. Siemens S7-400H Profibus

Competitor References：

Siemens: ET 200SP PROFINET module (no redundant wide-temp version)

Schneider: Modicon X80 CANopen module (non-ControlNet ecosystem)

Selection Guide：

For high reliability in extreme environments → Choose 1756-CN2RXT

For standard factory networks → Standard 1756-CN2R is more cost-effective

(Note: Final selection should be based on Rockwell Automation’s official documentation.)