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- ControlLogix ControlNet Communication Module
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Industrial Communication Module Technical Report
Model: 1756-EN2T EtherNet/IP Communication Module
1. Product Overview
The 1756-EN2T is a ControlLogix EtherNet/IP communication module used for high-speed industrial Ethernet networking. It enables a PLC controller to communicate with distributed automation devices such as I/O modules, HMIs, drives, and SCADA systems over an Ethernet-based industrial network.
This module supports real-time data exchange using the EtherNet/IP protocol and is widely used in modern industrial automation systems due to its high connection capacity, stability, and integration flexibility.
It is designed as a single-slot chassis module and connects directly to the ControlLogix backplane, acting as a bridge between controller logic and Ethernet networks.
2. Brand and Series Information
- Brand: Industrial automation control platform
- Series: ControlLogix 1756 Series
- Product Family: EtherNet/IP Communication Modules
- Module Type: Ethernet Communication Bridge Module
The 1756 series provides modular PLC architecture, allowing users to configure communication, control, and I/O modules within a unified chassis system.
3. Product Description
The 1756-EN2T module provides 10/100 Mbps EtherNet/IP communication using copper RJ45 interfaces. It supports both scheduled and unscheduled messaging, enabling deterministic control as well as standard TCP/IP communication.
It can handle high numbers of industrial connections, making it suitable for large distributed systems. It also supports CIP protocol communication, which is widely used in industrial automation for real-time control and diagnostics.
The module is typically used in ControlLogix systems where Ethernet is the main backbone for communication between controllers and field devices.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocol | EtherNet/IP (CIP) |
| Network Type | Industrial Ethernet (Copper RJ45) |
| Data Rate | 10/100 Mbps |
| Number of Ports | 1 Ethernet port (RJ45) |
| Logix Connections | up to 256 |
| TCP/IP Connections | up to 128 |
| USB Port | 1 configuration port |
| Power Consumption | 5.1 W |
| Current Draw | 1.0–1.2 A @ 5.1V DC |
| Auxiliary Current | 3 mA @ 24V DC |
| Thermal Dissipation | 17.4 BTU/hr |
| Isolation Voltage | 30 V continuous |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5% – 95% non-condensing |
| Vibration Resistance | 2 G (10–500 Hz) |
| Shock Resistance | 30 G operating |
| Chassis Compatibility | 1756 ControlLogix chassis |
| Slot Width | 1 slot |
| Dimensions | 140 × 145 × 35 mm |
| Weight | 0.5 kg (approx.) |
5. Product Applications
The 1756-EN2T is widely used in industrial automation systems requiring Ethernet-based communication:
- Factory automation and production lines
- SCADA monitoring and control systems
- Power generation control networks
- Oil and gas processing systems
- Automotive manufacturing systems
- Material handling and logistics systems
- Distributed I/O control networks
- Industrial machine-to-machine communication
It is especially suitable for real-time control systems using Ethernet as the main industrial backbone.
6. Product Advantages
- High-speed industrial Ethernet communication (10/100 Mbps)
- Supports large number of connections (up to 256 Logix connections)
- Stable real-time CIP communication
- Flexible integration into ControlLogix architecture
- Supports both control and diagnostic data exchange
- Compact single-slot design
- Reliable operation in industrial environments
- Strong compatibility with modern automation systems
- Supports both PLC and SCADA integration
- Proven long-term industrial stability
7. Same Series / Related Models (ControlLogix Ethernet Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-EN2T | Standard EtherNet/IP module | 10/100 Mbps, 256 connections, ~0.5 kg |
| 1756-EN2TR | Redundant Ethernet module | Dual ports, ring redundancy support |
| 1756-EN2F | Fiber Ethernet module | Fiber optic communication, EMI resistant |
| 1756-ENBT | Legacy Ethernet module | Basic Ethernet/IP communication |
| 1756-EWEB | Web-enabled Ethernet module | Web diagnostics and monitoring |
8. Other Popular Modules in Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC controller module | High-performance CPU, large memory |
| 1756-L72 | Advanced PLC controller | Faster processing and extended capacity |
| 1756-IF8 | Analog input module | 8-channel analog signal acquisition |
| 1756-OB16E | Digital output module | 16-point electronic output control |
| 1756-IB16 | Digital input module | 16-channel industrial input module |
9. Engineering Summary
The 1756-EN2T is a core EtherNet/IP communication module used in modern industrial automation systems. It provides high-speed, reliable, and scalable Ethernet communication between PLC controllers and distributed devices.
Compared with older communication technologies, it significantly improves network flexibility, system integration capability, and data throughput.
It remains one of the most widely used Ethernet modules in ControlLogix systems due to its balance of performance, stability, and compatibility.