PRODUCT INFORMATION
Product Overview
Revision scope: These specifications describe 1756-EN3TR/A (Series A). Check the corresponding technical data before specifying another hardware series.
The Allen-Bradley 1756-EN3TR is a ControlLogix communication module for industrial EtherNet/IP networks. It operates as a network interface within a standard ControlLogix chassis. The module features two RJ45 Ethernet ports to support linear and Device Level Ring topologies. It provides connectivity for controller messaging, distributed I/O control, and supervisory systems.
This Series A hardware interface manages up to 128 CIP connections and 256 TCP connections. A front full-speed USB port provides temporary local programming and diagnostic access. The unit occupies one chassis slot and draws 1.2 A at 5.1V DC. It dissipates 6.12 W of power and produces 20.9 BTU per hour during operation. Network transmission operates at 10/100 Mbps using twisted-pair copper media.
TECHNICAL DATA
Technical Specifications
These specifications describe 1756-EN3TR/A (Series A). Check the corresponding technical data before specifying another hardware series.
| Parameter | Specification |
|---|
| Communication Rate | 10/100 Mbps |
|---|
| Ethernet Ports | 2 RJ45 Category 5 |
|---|
| CIP Connections | 128 |
|---|
| TCP Connections | 256 |
|---|
| CIP Unconnected Messages | 128 backplane + 128 Ethernet |
|---|
| Current Draw @ 5.1V DC | 1.2 A |
|---|
| Current Draw @ 24V DC | 3 mA |
|---|
| Power Dissipation | 6.12 W |
|---|
| Thermal Dissipation | 20.9 BTU/hr |
|---|
| Slot Width | 1 slot |
|---|
| Module Location | Chassis-based, any slot |
|---|
| USB Port | USB full speed (12 Mbps) |
|---|
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
|---|
| Storage Temperature | -40 °C to 85 °C (-40 °F to 185 °F) |
|---|
| Relative Humidity | 5% to 95% noncondensing |
|---|
| Operating Vibration | 2 g @ 10 to 500 Hz |
|---|
| Operating Shock | 30 g |
|---|
| Temperature Code | T4 |
|---|
| Enclosure Type Rating | None (open-style) |
|---|
TECHNICAL INFORMATION
Order Information
| Revision Part # | Also known as | Reference Price |
|---|
| 1756-EN3TR Ser A | 1756-EN3TR/A, Series A | USD 955.00, indicative (Used/Refurbished) |
Reference prices are observed third-party market prices for the stated revision, not a final Aituos quotation.
TECHNICAL INFORMATION
Features
- Provides two 10/100 Mbps RJ45 Ethernet ports for network connections.
- Supports Device Level Ring and linear network architectures.
- Accommodates up to 128 simultaneous CIP connections.
- Supports up to 256 TCP communication links.
- Features a front full-speed USB port for temporary programming.
- Includes built-in duplicate IP address detection across all revisions.
TECHNICAL INFORMATION
Applications
- Industrial EtherNet/IP distributed I/O network communication.
- Device Level Ring topology for media fault tolerance.
- Supervisory HMI connectivity and plant-floor messaging.
- Inter-chassis ControlLogix controller produced and consumed tag exchange.
TECHNICAL INFORMATION
Connections / Interfaces
- Two RJ45 Ethernet ports supporting Category 5 copper media.
- One full-speed 12 Mbps USB port for temporary local connections.
- ControlLogix backplane connector for chassis bus power and communication.
TECHNICAL INFORMATION
Installation Guidelines
- Install the module into any available slot of a ControlLogix chassis.
- Verify that total backplane current draw remains within power supply ratings.
- Use Category 5 shielded or unshielded twisted-pair Ethernet cables.
- Route communication cabling away from sources of high electrical noise.
- Maintain ambient operating temperatures between 0 °C and 60 °C.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure network parameters using Studio 5000 or RSLogix 5000 software.
- Unicast produced and consumed tags require RSLogix 5000 version 18.02.00 or later.
- Enable duplicate IP detection during device setup.
- Set up ring nodes when implementing a Device Level Ring network.
TECHNICAL INFORMATION
Compatibility
- Compatible with ControlLogix chassis models 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17.
- Works with standard power supplies 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75, 1756-PC75, and 1756-PH75.
- Supports redundant power supplies 1756-PA75R, 1756-PB75R, and 1756-PSCA2.
TECHNICAL INFORMATION
Compliance and Certifications
- CISPR 11 (IEC 61000-6-4) Class A emissions compliant.
- Temperature code rating T4.
- Open-style enclosure rating.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with ControlLogix chassis models 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17. Works with standard power supplies 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75, 1756-PC75, and 1756-PH75. Supports redundant power supplies 1756-PA75R, 1756-PB75R, and 1756-PSCA2.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What network topologies are supported by the 1756-EN3TR/A module?
The module supports linear topologies and Device Level Ring architectures using its two RJ45 ports.
How many simultaneous CIP connections does the 1756-EN3TR/A support?
The module supports up to 128 CIP connections and 256 TCP connections across Ethernet.
What is the reference price for an Allen-Bradley 1756-EN3TR/A?
Market observations indicate a reference price of approximately $955.00 for refurbished units. Pricing figures are indicative market reference pricing only and are not a final quotation.
What software version is required for unicast tags with the 1756-EN3TR?
Unicast produced and consumed tags require RSLogix 5000 software version 18.02.00 or later.
