EtherNet/IP Network Communication Solution – Allen-Bradley 1756-EN2T/D | ControlLogix Series
The Allen-Bradley 1756-EN2T/D is a high-performance EtherNet/IP bridge module designed for the ControlLogix platform. Series D delivers enhanced network throughput, deterministic communication, and seamless integration into modern industrial Ethernet architectures — making it the preferred choice for engineers specifying reliable I/O and controller-to-controller communication in demanding automation environments.
Where This Product Is Used
The 1756-EN2T/D is deployed across a wide range of industrial sectors where deterministic, high-speed EtherNet/IP communication is critical:
- Automotive Manufacturing — Body-in-white welding lines, paint shop conveyors, and assembly cell coordination requiring sub-millisecond I/O response times.
- Oil & Gas Processing — Upstream wellhead control, midstream pipeline SCADA integration, and downstream refinery DCS-to-PLC bridging over EtherNet/IP.
- Food & Beverage — High-speed packaging lines, CIP (Clean-in-Place) system control, and multi-zone temperature management with distributed I/O.
- Water & Wastewater Treatment — SCADA-connected pump station control, remote lift station monitoring, and plant-wide network segmentation.
- Pharmaceutical & Life Sciences — Batch process control under FDA 21 CFR Part 11 environments, requiring validated, auditable network communication.
- Material Handling & Logistics — Sortation systems, automated storage and retrieval (AS/RS), and conveyor network coordination.
- Power Generation & Utilities — Substation automation, turbine control integration, and grid-edge device communication via EtherNet/IP.
Technical Specifications
| Catalog Number | 1756-EN2T/D |
| Series | D |
| Platform | ControlLogix (1756 Chassis) |
| Communication Protocol | EtherNet/IP (CIP over TCP/IP) |
| Network Speed | 10/100 Mbps, Auto-negotiate |
| Ethernet Ports | 1 × RJ-45 (10/100BASE-T) |
| Max CIP Connections | 256 (Class 1 + Class 3 combined) |
| Max I/O Connections | 128 Class 1 (I/O) connections |
| Max Explicit Connections | 128 Class 3 (messaging) connections |
| Backplane Current Draw | 1.0 A @ 5 VDC; 3.0 mA @ 24 VDC |
| 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 |
| Dimensions (H × W × D) | 94.0 × 44.5 × 99.1 mm |
| Weight | Approx. 0.18 kg |
| Firmware | Upgradeable via ControlFLASH |
| Chassis Slots Required | 1 |
| IP Rating | IP20 (panel-mount enclosure required) |
Why Engineers Specify This Model
- Series D Enhancements — Improved firmware stability, enhanced diagnostics, and better interoperability with Studio 5000 Logix Designer v21+.
- 256 CIP Connections — Supports large-scale distributed I/O topologies without requiring additional bridge modules, reducing BOM cost and chassis slot consumption.
- Dual-Role Operation — Functions simultaneously as a scanner (for remote I/O) and adapter (for controller-to-controller messaging), eliminating the need for separate modules.
- Integrated Web Server — Built-in HTTP diagnostics page for real-time connection status, IP configuration, and module health — no additional software required.
- IGMP Snooping Support — Enables multicast traffic management on managed switches, critical for large EtherNet/IP networks with multiple producers.
- ControlFLASH Upgradeable — Field firmware updates without module replacement, protecting long-term investment in installed base.
- Drop-in Replacement — Series D is backward-compatible with Series A/B/C installations; no re-wiring or chassis modification required.
Complete System Bill of Materials
A typical ControlLogix EtherNet/IP node using the 1756-EN2T/D requires the following components:
- 1756-EN2T/D — EtherNet/IP Bridge Module (this item)
- 1756-L7x / 1756-L8x — ControlLogix Controller (e.g., 1756-L73, 1756-L83E)
- 1756-A7 / 1756-A10 / 1756-A13 / 1756-A17 — ControlLogix Chassis (7, 10, 13, or 17 slot)
- 1756-PA72 / 1756-PB72 — ControlLogix Power Supply (120/240 VAC or 18–32 VDC)
- 1756-TBCH / 1756-TBS6H — Chassis Mounting Hardware (if required)
- Stratix 5700 / 5400 — Managed Industrial Ethernet Switch (recommended for large topologies)
- 1756-IB16 / 1756-OB16E — Digital I/O Modules (application-dependent)
- 1756-IF8 / 1756-OF8 — Analog I/O Modules (application-dependent)
- CAT5e / CAT6 Shielded Cable — Industrial-grade Ethernet cabling
Compliance & Industry Standards
- UL Listed — UL 508 (Industrial Control Equipment)
- CE Marked — EN 61131-2, EMC Directive 2014/30/EU
- ODVA Conformance Tested — EtherNet/IP conformance certified by ODVA
- RoHS Compliant — Directive 2011/65/EU (Restriction of Hazardous Substances)
- ATEX / IECEx — Not rated for Zone 0/1; install in appropriate enclosure for hazardous locations
- IEC 61158 / IEC 61784 — Fieldbus and industrial network standards compliance
- SEMI E54 — Applicable for semiconductor fab automation environments
Quality Assurance & Sourcing
Konmask.com specializes in the procurement of genuine, traceable industrial automation components. Every 1756-EN2T/D unit we supply is subject to the following quality process:
- Authenticity Verification — Physical inspection of catalog label, series marking, date code, and Rockwell Automation holographic security features.
- Functional Pre-check — Module power-on test and LED status verification prior to shipment where applicable.
- Traceability Documentation — Certificate of conformance and supply chain documentation available on request.
- Packaging Integrity — ESD-safe anti-static packaging with moisture barrier for international shipment.
- Warranty — 12-month warranty against manufacturing defects; DOA replacement policy within 7 days of receipt.
How to Source This Part
To place an order or request a quotation for the 1756-EN2T/D:
- Online: Add to cart directly on this page for in-stock units.
- RFQ / Bulk Orders: Email [email protected] with your required quantity, delivery timeline, and project details.
- Phone / WhatsApp: +0086 19859288691 — available Monday–Saturday, 09:00–18:00 CST.
- Lead Time: In-stock units ship within 1–3 business days. Ex-stock sourcing typically 5–15 business days depending on origin.
- Export: We support DDP, DAP, EXW, and FOB Incoterms. Export documentation (CO, packing list, commercial invoice) provided for all international orders.
Application-Specific FAQ
Q: Can the 1756-EN2T/D be used in a redundant ControlLogix system?
A: Yes. When paired with a 1756-RM2/A redundancy module and a 1756-L7xR redundant controller, the EN2T/D supports seamless failover. Each chassis in the redundant pair requires its own EN2T/D module.
Q: What is the maximum RPI (Requested Packet Interval) supported?
A: The minimum RPI is 1 ms for Class 1 I/O connections. For most distributed I/O applications, 2–10 ms RPI is recommended to balance network load and response time.
Q: Is the 1756-EN2T/D compatible with Studio 5000 Logix Designer v33+?
A: Yes. Series D firmware is fully compatible with Studio 5000 v21 through v35+. Ensure firmware is updated to the latest revision via ControlFLASH for optimal compatibility.
Q: Can this module communicate with third-party EtherNet/IP devices (e.g., FANUC robots, Cognex cameras)?
A: Yes. The 1756-EN2T/D is ODVA-conformance tested and supports standard CIP messaging with any ODVA-certified EtherNet/IP device, including third-party robots, vision systems, drives, and sensors.
Q: What switch infrastructure is recommended for large EN2T/D deployments?
A: Rockwell Automation Stratix 5700 or 5400 managed switches are recommended. They support IGMP snooping, QoS, and DLR (Device Level Ring) topology — all critical for large ControlLogix EtherNet/IP networks.
Q: Does Konmask offer programming or commissioning support?
A: We focus on hardware supply. For commissioning support, we can refer you to certified Rockwell Automation system integrators in your region.
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