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Product Overview

Brand: Allen-Bradley (A-B)
Model: 1756-EN2TR
Product Type: ControlLogix EtherNet/IP Communication Module
Ports: 2 × RJ45 Ethernet
Network Speed: 10/100 Mbps
Network Topology: DLR / Linear
Chassis: ControlLogix
Slot Width: 1 slot
Status: Active

Key Technical Specifications

Parameter	Specification
Communication Protocol	EtherNet/IP
Ethernet Ports	2 × RJ45
Ethernet Speed	10/100 Mbps
Network Topology	DLR, Linear
TCP Connections	Max. 128
CIP Connections	Max. 256
Integrated Motion Axes	Up to 8
Current Draw	1 A @ 5.1 VDC
24 VDC Current	3 mA
Power Dissipation	5.1 W
Isolation Voltage	30 V continuous
Ethernet Cable	Cat 5 twisted pair
Mounting	ControlLogix Chassis
Slot Width	1 slot
Enclosure	Open Style
Operating Temperature	0 to 60°C
Humidity	5–95%, non-condensing

Rockwell specifies the 1756-EN2TR as a dual-port 10/100 Mbps EtherNet/IP module with up to 128 TCP connections and 256 CIP connections.

Advantages & Features

Dual Ethernet ports simplify network connections and device integration.
Supports Device Level Ring (DLR) for single-fault-tolerant network architectures.
Supports linear network topology.
Provides EtherNet/IP communication between ControlLogix controllers, remote I/O, drives, HMIs and other industrial devices.
Supports real-time I/O messaging and explicit messaging.
Supports up to 8 integrated motion axes on EtherNet/IP.
Compact one-slot ControlLogix design.
Suitable for high-performance industrial Ethernet applications.

Typical Applications

Industrial automation
ControlLogix PLC systems
Remote I/O communication
Servo and motion-control systems
HMI and SCADA communication
Packaging machinery
Manufacturing and production lines
Material handling
Process automation

Important Precautions

Install the module in a compatible ControlLogix chassis.
Use suitable Category 5 or better twisted-pair Ethernet cabling.
Configure the IP address and network parameters correctly before commissioning.
For DLR applications, connect the two Ethernet ports according to the required ring topology.
Check controller, firmware and module-series compatibility before replacement; Rockwell documents different firmware requirements by module series.
Disconnect power before installing or removing the module.
The module is open-style, so install it inside an appropriate control enclosure.