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Allen-Bradley 1756-EN2TR ControlLogix EtherNet/IP Dual Port Communication Module

SKU 1756-EN2TR

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12-month warranty
Free returns within 30 days

Manufacturer: Allen-Bradley
Product No.: 1756-EN2TR
Origin United States
Product Type: EtherNet/IP Communication Module
Barcode: 8537101190
Payment: T/T, Western Union
Weight: 0.3 kg
Dimensions: 35 x 145 x 140 mm (W x H x D)
Shipping port: Xiamen
Warranty: 12 months

Product Documentation

Technical Datasheet (PDF) Complete specifications and technical drawings.

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Product Description

Description

The Allen-Bradley 1756-EN2TR is a dual-port EtherNet/IP communication module designed for ControlLogix industrial Ethernet networks.

It combines an embedded Ethernet switch with two 10/100 Mbps copper ports. The module supports Device Level Ring (DLR) and linear EtherNet/IP network topologies.

The 1756-EN2TR provides communication between the ControlLogix backplane and EtherNet/IP devices. It supports real-time I/O messaging, controller data exchange, produced and consumed tags, and CIP communication.

Features

Allen-Bradley 1756-EN2TR provides dual-port EtherNet/IP communication for ControlLogix control systems.
Embedded Ethernet switch architecture supports Device Level Ring (DLR) and linear network topologies.
Connects ControlLogix controllers with remote I/O, HMIs, drives, and other EtherNet/IP devices.
Handles real-time I/O communication, explicit CIP messaging, and controller data exchange.
Produced and consumed tag functions support deterministic data sharing between compatible Logix controllers.
EtherNet/IP socket services and SNMP functions provide additional network communication and diagnostic capabilities.
Precision Time Protocol (PTP) and CIP Sync support synchronized operation in compatible Logix architectures.
Integrated Motion on EtherNet/IP is supported with applicable firmware and ControlLogix controller configurations.
Redundant I/O capability is available with supported firmware revisions.
Electronic Keying and explicit protected mode provide configuration control within supported ControlLogix installations.
Front-panel status display and network indicators provide module, CIP connection, and Ethernet link diagnostics.

Applications

ControlLogix EtherNet/IP communication networks.
Controller-to-remote-I/O communication.
Device Level Ring network architectures.
Linear EtherNet/IP network architectures.
Controller-to-controller data exchange.
HMI and supervisory communication.
Produced and consumed tag communication.
Industrial Ethernet messaging applications.
EtherNet/IP motion-control networks.
PTP and CIP Sync time synchronization.
Redundant I/O architectures with supported firmware.
Industrial network diagnostics and maintenance.

Ordering Information

Ordering Parameter	Information
Catalog Number	1756-EN2TR
Product Family	ControlLogix
Product Type	EtherNet/IP Communication Module

Technical Specifications

General

Parameter	Specification
Manufacturer	Allen-Bradley
Model	1756-EN2TR
Product Family	ControlLogix
Product Type	Communication Module
Application	EtherNet/IP
Display	Digital alphanumeric status display
Enclosure	None, open-style
Mounting	ControlLogix chassis
Module Location	Chassis based, any slot
Slot Width	1
Temperature Code	T4

Ethernet Communication

Parameter	Specification
Communication Protocol	EtherNet/IP
Ethernet Protocol	TCP/IP
Network Function	EtherNet/IP bridge with embedded switch
Ethernet Ports	2
Port Type	Copper RJ45
Communication Rate	10/100 Mbps
Ethernet Media	Dual copper
Ethernet Cable	802.3 compliant shielded or unshielded twisted pair
Ethernet Port Cable Category	Category 5
Device Level Ring	Supported
Linear Topology	Supported
TCP Connections, Maximum	128
CIP Connections, Maximum	256
CIP Unconnected Messages	128 + 128, backplane + Ethernet
Socket Services	Supported
SNMP	Supported
Duplicate IP Detection	Supported
Produced/Consumed Tags	Supported
Multicast Produced Tags, Maximum	32
Unicast Support	RSLogix 5000 version 17.01.02 or later

Performance

Parameter	Specification
I/O Packet Rate, Firmware 2.x	10,000 packets/second
I/O Packet Rate, Firmware 5.x or Later	25,000 packets/second
HMI/MSG Packet Rate	2,000 packets/second
Integrated Motion, Firmware 5.x or Later	Up to 8 axes with applicable ControlLogix controller

Network and System Functions

Parameter	Specification
Precision Time Protocol	Supported from firmware revision 3.004
CIP Sync	Supported from firmware revision 3.004
Backplane DDR Communication	Supported from firmware revision 3.006
Redundant I/O	Supported from firmware revision 4.002
Explicit Protected Mode	Supported from firmware revision 11.001
Electronic Keying	Supported

Software Compatibility

Parameter	Specification
Firmware 2.x - RSLogix 5000	Version 17.01.02 or later
Firmware 2.x - RSLinx	Version 2.55 or later
Firmware 5.x or Later - RSLogix 5000	Version 18.02.00 or later
Firmware 5.x or Later - RSLinx	Version 2.56 or later
Firmware 5.028 Release - RSLogix 5000	Version 20.01.00 or later
Firmware 5.028 Release - RSLinx Classic	Version 2.56.00 or later
Firmware 5.028 Release - RSNetWorx for EtherNet/IP	Version 10.00.00 or later
Firmware 5.028 Release - ControlFLASH	Version 11.00.00 or later
Firmware 5.028 Release - USB CIP Driver	Version 3.09.00 or later

Electrical

Parameter	Specification
Current Draw	1 A @ 5.1V DC, 3 mA @ 24V DC
Power Dissipation	5.1 W
Thermal Dissipation	17.4 btu/h
Isolation Voltage	30V continuous, Basic Insulation Type
Isolation Type Test	980V AC @ 60s

The stated isolation specification applies to the 1756-EN2TR/C configuration identified in the supplied technical data.

Wiring

Parameter	Specification
Ethernet Port Wiring Category	2
USB Port Wiring Category	3

Connections/Interfaces

Interface	Function
Ethernet Port 1	10/100 Mbps copper EtherNet/IP network connection
Ethernet Port 2	10/100 Mbps copper EtherNet/IP network connection
ControlLogix Backplane	Communication with controllers and modules in the chassis
USB Interface	Local communication and firmware servicing
Module Status Display	Displays IP address, operating status, configuration messages, and faults
LINK 1 Indicator	Indicates link and activity status for Ethernet Port 1
LINK 2 Indicator	Indicates link and activity status for Ethernet Port 2
NET Indicator	Indicates CIP connection and EtherNet/IP network status on new-series modules
OK Indicator	Indicates module operating, configuration, and fault status

Installation Guidelines

Chassis Installation

Install the 1756-EN2TR in an available ControlLogix chassis slot.
Make sure the module is fully seated in the chassis and connected to the backplane.
Verify chassis power before beginning network configuration.

Ethernet Cabling

Connect the two RJ45 ports using 802.3-compliant twisted-pair Ethernet cable.
Shielded or unshielded Ethernet cable can be used according to the specified installation requirements.
Use both Ethernet ports when implementing Device Level Ring or linear network topologies.
Configure the module and connected switch with matching speed and duplex settings.
Use autonegotiation on both sides, or manually configure both sides for 100/Full operation.

IP Address Configuration

Prepare the programming workstation with the required EtherNet/IP or USB communication driver.
Obtain the module MAC ID from the device label before assigning the network address.
The X, Y, and Z rotary switches can set the final portion of the IP address.
Valid rotary-switch values range from 001 through 254.
The module reads the rotary-switch settings during power-up.

Commissioning

Verify the OK, LINK 1, and LINK 2 indicators after installation.
Confirm that each required Ethernet port establishes a physical network link.
Verify that the configured IP address is unique on the EtherNet/IP network.
Confirm CIP communication with the ControlLogix system before placing the network into service.

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What is the Allen-Bradley 1756-EN2TR used for?

The 1756-EN2TR provides EtherNet/IP communication between a ControlLogix chassis and industrial Ethernet devices. It handles real-time I/O, controller messaging, and produced/consumed tag communication.

Does the 1756-EN2TR support Device Level Ring networks?

Yes. Its embedded dual-port Ethernet switch supports Device Level Ring and linear EtherNet/IP topologies through two 10/100 Mbps copper network ports.

How many TCP and CIP connections does the module support?

The module supports up to 128 TCP connections and 256 CIP connections, plus 128 + 128 CIP unconnected messages across the backplane and Ethernet interfaces.

What Ethernet interfaces are available on the communication module?

The device provides two copper RJ45 Ethernet ports operating at 10/100 Mbps. The embedded switch enables direct participation in DLR and linear network architectures.

Does the module support PTP and CIP Sync time synchronization?

Yes. Precision Time Protocol and CIP Sync support were introduced with firmware revision 3.004 for compatible ControlLogix and Logix 5000 configurations.

How should the Ethernet switch speed and duplex settings be configured?

The module and switch port should use matching settings. Configure both for autonegotiation, or manually configure both sides for 100 Mbps full-duplex operation.

How is an IP address assigned with the module rotary switches?

The X, Y, and Z rotary switches set the final portion of the IP address. Valid rotary-switch values range from 001 through 254 and are read during power-up.

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