Allen-Bradley 1756-EN2TR 2-Port High-Capacity EtherNet/IP Module – ControlLogix Series
When a ControlLogix chassis loses its EtherNet/IP communication bridge, the consequences cascade instantly: HMI screens go blank, SCADA systems lose visibility, peer-to-peer I/O messaging halts, and production lines freeze — all without a single mechanical failure. In process-critical environments such as oil & gas, automotive assembly, and water treatment, even seconds of unplanned downtime translate into tens of thousands of dollars in losses and potential safety incidents. The Allen-Bradley 1756-EN2TR exists precisely to prevent this scenario, delivering a hardened, high-throughput EtherNet/IP gateway that keeps your ControlLogix system communicating under the most demanding industrial conditions.
Within the 1756 ControlLogix family — Rockwell Automation’s flagship programmable automation controller platform — the 1756-EN2TR occupies the high-capacity tier of EtherNet/IP communication modules. Its dual RJ-45 twisted-pair ports with Device Level Ring (DLR) support distinguish it from the single-port 1756-EN2T, making it the preferred choice for ring-topology networks where fault recovery must occur in under 3 milliseconds. Globally, the ControlLogix platform powers millions of automation nodes across discrete manufacturing, process industries, and critical infrastructure, and the 1756-EN2TR is one of its most widely deployed communication backbones.
Technical Specifications
- Catalog Number: 1756-EN2TR
- Series: ControlLogix (1756)
- Communication Protocol: EtherNet/IP
- Network Ports: 2 × RJ-45 (10/100 Mbps, twisted-pair)
- Topology Support: Linear, Star, Device Level Ring (DLR)
- DLR Fault Recovery: < 3 ms (typical)
- Backplane Communication: ControlLogix 1756 backplane
- Supported Connections: Up to 256 TCP connections
- Messaging: Produced/Consumed tags, MSG instructions, CIP routing
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% non-condensing
- Power Consumption: Refer to Rockwell Automation publication 1756-TD001
- Certifications: UL, CE, C-Tick, ATEX (zone 2 with appropriate enclosure)
- Firmware: Field-upgradeable via ControlFLASH
Note: All specifications are sourced from Rockwell Automation official documentation. Konmask.com does not fabricate or alter manufacturer specifications.
Key Features & Benefits
- Dual-Port DLR Support: Enables Device Level Ring topology for sub-3 ms automatic fault recovery — critical for continuous-process applications where network interruption is unacceptable.
- High Connection Capacity: Supports up to 256 TCP connections simultaneously, accommodating large distributed I/O networks, multiple HMI clients, and SCADA integrations without bottlenecking.
- CIP Routing: Acts as a bridge between the ControlLogix backplane and the EtherNet/IP network, enabling seamless MSG instruction routing to remote chassis, drives, and field devices.
- Produced/Consumed Tag Support: Facilitates peer-to-peer data exchange between ControlLogix controllers across the network without PLC-to-PLC programming overhead.
- Firmware Upgradeable: Field-upgradeable firmware via ControlFLASH ensures long-term compatibility with evolving Studio 5000 / RSLogix 5000 environments.
- Compact 1756 Form Factor: Single-slot ControlLogix module — maximizes chassis density in space-constrained control panels.
- Broad Protocol Compatibility: Supports EtherNet/IP Class 1 (I/O) and Class 3 (explicit messaging) connections for maximum device interoperability.
Industry & Equipment Applications
- Automotive Manufacturing: Body-in-white welding lines, paint shop conveyors, and powertrain assembly cells requiring deterministic ring-network communication.
- Oil & Gas: Wellhead control panels, pipeline SCADA nodes, and compressor station PLCs where network redundancy is a safety requirement.
- Water & Wastewater Treatment: Pump station controllers, SCADA-integrated treatment plant PLCs, and distributed I/O networks across large facilities.
- Food & Beverage: High-speed packaging lines and CIP (Clean-in-Place) systems requiring reliable EtherNet/IP connectivity with washdown-rated field devices.
- Pharmaceutical: Batch process controllers in FDA-regulated environments where network uptime directly impacts GMP compliance.
- Power Generation & Distribution: Substation automation and turbine control systems integrated with ControlLogix-based DCS architectures.
- Material Handling & Logistics: Conveyor sortation systems, AS/RS (Automated Storage and Retrieval Systems), and AGV fleet management networks.
System Integration & Compatible Parts
The 1756-EN2TR is designed to operate within the broader Rockwell Automation ControlLogix ecosystem. Common compatible and complementary components include:
- Controllers: 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75R, 1756-PB75R
- Redundancy Modules: 1756-RM2, 1756-RM2XT (for redundant controller configurations)
- Remote I/O Adapters: 1734-AENTR (POINT I/O), 1738-AENTR (ArmorPOINT I/O)
- Managed Switches: Stratix 5700, Stratix 8000 (for DLR ring infrastructure)
- Programming Software: Studio 5000 Logix Designer v21 and above
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1756-EN2TR module we supply undergoes a structured verification process before shipment:
- Source Verification: Units are sourced from authorized distributors, certified surplus channels, or directly from Rockwell Automation-approved supply chains. We do not deal in counterfeit or grey-market goods.
- Visual & Physical Inspection: Each module is inspected for physical damage, connector integrity, label authenticity, and firmware revision markings.
- Functional Testing (where applicable): Surplus units undergo bench-level power-on and communication testing prior to dispatch.
- Secure Packaging: Modules are shipped in ESD-safe packaging with appropriate cushioning to prevent transit damage.
- Documentation: Datasheets, firmware revision notes, and test records are available upon request.
How to Order
- Submit an Inquiry: Use the contact form on this page or email support@konmask.com with your required quantity and delivery timeline.
- Receive a Quote: Our team will respond within 1 business day with pricing, lead time, and availability confirmation.
- Confirm & Pay: We support T/T (bank transfer), PayPal, and other B2B payment arrangements. Proforma invoice provided upon order confirmation.
- Shipping & Tracking: We ship globally via DHL, FedEx, UPS, and sea freight for bulk orders. Real-time tracking provided.
- After-Sales Support: Our engineering team is available post-delivery for integration questions and technical guidance.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and industrial automation components — not a generalist marketplace.
- Global B2B Supply: Serving system integrators, OEMs, and plant maintenance teams across Asia, Europe, the Middle East, and the Americas.
- Fast Response: Dedicated sales engineers respond to inquiries within 24 hours, with technical support available for complex integration questions.
- Competitive Pricing: Direct supplier relationships and efficient sourcing allow us to offer competitive pricing on both new and certified surplus inventory.
- Reliable Logistics: Proven export experience with proper commercial documentation (commercial invoice, packing list, COO) for smooth customs clearance.
Frequently Asked Questions
Q: What is the difference between the 1756-EN2T and the 1756-EN2TR?
A: The 1756-EN2TR has two RJ-45 ports and supports Device Level Ring (DLR) topology for sub-3 ms fault recovery. The 1756-EN2T has a single RJ-45 port and does not support DLR. Choose the EN2TR for ring-topology networks requiring automatic fault recovery.
Q: Is the 1756-EN2TR compatible with all ControlLogix controllers?
A: Yes, the 1756-EN2TR is compatible with all 1756 ControlLogix controllers (L6x and L8x series) and fits any standard 1756 chassis slot. Studio 5000 Logix Designer v21 or later is recommended for full feature support.
Q: Can the 1756-EN2TR be used in a redundant controller system?
A: Yes. When paired with a 1756-RM2 redundancy module and a redundant controller pair (e.g., 1756-L8xE series), the 1756-EN2TR supports ControlLogix redundancy configurations. Refer to Rockwell publication 1756-UM535 for detailed redundancy setup guidance.
Q: How many I/O connections can the 1756-EN2TR support?
A: The module supports up to 256 TCP connections, which encompasses I/O connections, HMI connections, MSG instruction connections, and produced/consumed tag connections combined.
Q: Do you supply new or surplus 1756-EN2TR modules?
A: Konmask.com supplies both new (factory-sealed) and certified surplus (tested, inspected) units depending on availability. Please specify your preference when submitting an inquiry and we will confirm stock status.
Q: What is the lead time for the 1756-EN2TR?
A: Lead time varies by stock availability. In-stock units typically ship within 2–5 business days. For out-of-stock items, our sourcing team will provide an estimated lead time upon inquiry.
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