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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-EN3TR |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Type | ControlLogix EtherNet/IP Communication Module |
| Ethernet Ports | 2 × RJ45, 10/100 Mbps |
| Integrated Motion Axes | Up to 128 |
| Maximum TCP Connections | 128 |
| Maximum CIP Connections | 256 |
| Backplane Current (5.1V DC) | 1 A |
| Backplane Current (24V DC) | 3 mA |
| Power Dissipation | 5.1 W |
| Thermal Dissipation | 17.4 BTU/hr |
| Isolation Voltage | 30V continuous (Ethernet to backplane); tested at 980V AC for 60s |
| Operating Temperature | 0…60 °C (32…140 °F) |
| Slot Width | 1 |
| Enclosure Rating | None (open-style) |
| Certifications | ATEX/IECEx Ex nA IIC T4 Gc; ABS Marine approved |
Main Features and Advantages
Extended Integrated Motion capacity: The defining advantage of the 1756-EN3TR over the standard 1756-EN2TR is its motion axis support. While the EN2TR handles standard EtherNet/IP I/O and messaging, the 1756-EN3TR extends the platform to coordinate up to 128 integrated motion axes on the same network . This capability allows machine builders and system integrators to consolidate motion and standard control traffic onto a single EtherNet/IP infrastructure, reducing cabling complexity and eliminating the need for separate motion networks in applications ranging from packaging machinery to material handling systems.
Dual-port redundancy with DLR and PRP support: The 1756-EN3TR provides two RJ45 Ethernet ports that support both Device Level Ring and Parallel Redundancy Protocol topologies . DLR allows the module to participate in a ring network where a single cable break does not disrupt communication—the ring supervisor detects the fault and redirects traffic through the alternate path. PRP provides seamless redundancy by transmitting duplicate frames over two independent networks simultaneously. These redundancy options make the 1756-EN3TR suitable for continuous-process applications where network availability directly affects production uptime.
High connection density for complex architectures: With support for 128 TCP connections and 256 CIP connections, the 1756-EN3TR can manage communication with a large number of devices—remote I/O adapters, drives, HMIs, and peer controllers—without requiring additional communication modules . This connection capacity is particularly valuable in large ControlLogix systems where a single chassis serves as the central controller for an entire production line or process area.
Marine and hazardous location certifications: The 1756-EN3TR carries ABS Marine approval for monitoring and control systems on vessels with DPS, ACC, and ACCU notations, as well as ATEX/IECEx certification for Zone 2 hazardous locations (Ex nA IIC T4 Gc) . These certifications extend the module’s applicability to offshore platforms, marine vessels, and industrial environments where flammable atmospheres may be present under abnormal conditions.
