Allen‑Bradley 1756‑EN2T ControlLogix EtherNet/IP Communication Module

1756‑EN2T is a single-port EtherNet/IP communication module designed exclusively for Rockwell Allen‑Bradley ControlLogix 1756 chassis systems. It acts as a high-speed network gateway, establishing bidirectional data links between ControlLogix controllers, remote I/O racks, HMI touchscreens, SCADA servers and variable frequency drives over standard industrial Ethernet networks, supporting both real-time implicit I/O messaging and explicit TCP/IP data exchange.

This single-slot pluggable module features one 10/100Mbps RJ45 copper Ethernet port and a front USB configuration port for offline IP setup. Built-in galvanic isolation separates the industrial Ethernet network from the ControlLogix backplane to suppress EMI interference. Hot-swap replacement is supported without full rack shutdown, delivering stable high-bandwidth communication for process manufacturing, power generation and automated motion control facilities.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation); Model: 1756‑EN2T; Series: ControlLogix 1756 Communication Modules
• Ethernet Interface: Single Category 5 RJ45 port, auto-sensing 10/100 Mbps full/half duplex transmission
• Connection Capacity: Max 128 TCP connections, total 256 CIP connections for I/O and messaging tasks
• Backplane Power Draw: 1.0 A @ 5.1 VDC, 3 mA @ 24 VDC, total power dissipation 5.1 W
• Isolation Rating: 980 VAC 60-second reinforced isolation between Ethernet port and chassis backplane
• Configuration Port: Front USB mini port for quick IP address assignment via Rockwell software tools
• Physical Structure: Single 1756 chassis slot, IP20 cabinet protection, standard industrial modular form factor
• Operating Environment: 0℃ ~ +60℃ continuous working temperature, 5%–95% RH non-condensing, shock and vibration resistant
• Diagnostic Indicators: Front-panel LINK, NET, OK LED lights to display link status, network activity and module health
• Certifications: CE, UL, ODVA EtherNet/IP conformance certified, compliant with global industrial automation standards

Core Functions

• Transmit real-time implicit I/O data between ControlLogix CPU and distributed EtherNet/IP remote I/O racks for fast closed-loop process control.
• Process explicit TCP/IP messages to exchange production data, fault logs and parameter sets with upper SCADA and HMI monitoring systems.
• USB front port enables technicians to configure static IP addresses, upload firmware and troubleshoot network faults without connecting to the main controller.
• Hardware isolation circuits block industrial surge voltage and electromagnetic noise to protect the ControlLogix backplane and core CPU unit.
• Multi-status LED indicators provide instant visual diagnosis of cable disconnection, network overload and module internal faults for rapid on-site maintenance.
• Hot-swappable single-slot design allows independent module replacement without powering down the entire automation chassis to minimize production downtime.

Application Scenarios

• EtherNet/IP communication spare replacement for ControlLogix PLC racks in automotive assembly, packaging and food & beverage production lines.
• Network gateway module for thermal power plants, combined cycle power stations and hydropower auxiliary control automation cabinets.
• Maintenance backup inventory for petrochemical compressor control systems, mining conveyor monitoring and water treatment distributed I/O networks.
• Matching communication module paired with ControlLogix L7/L8 series CPUs, digital/analog I/O modules and EtherNet/IP drives.
• Retrofit replacement for aging control systems suffering network disconnection, slow data transmission and communication link failure faults.

• Global aftermarket spare supply for industrial automation maintenance teams managing Rockwell ControlLogix equipment worldwide.