Allen-Bradley 1756-EN2TR/C EtherNet/IP Communication Module – Obsolete ControlLogix Spare Part

Technical Dossier

Product Details And Specifications

Allen-Bradley 1756-EN2TR/C EtherNet/IP Communication Module – Obsolete ControlLogix Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The 1756-EN2TR/C is not a generic communication card. Its dual-port architecture with Device Level Ring support was designed to provide fault-tolerant Ethernet connectivity within ControlLogix systems — a topology that single-port EtherNet/IP modules cannot replicate without network redesign. Facilities that built ring redundancy into their architecture around this module cannot substitute a different revision or a different module family without re-engineering the ring topology, re-validating all CIP connections, and in regulated industries, re-executing the full validation protocol.

This module is embedded in production infrastructure across automotive body and paint lines built between 2008 and 2016, food and beverage batch control systems running PlantPAx, oil and gas pipeline SCADA architectures with redundant Ethernet rings, and pharmaceutical manufacturing lines subject to FDA 21 CFR Part 11 validation — where any hardware substitution triggers a full revalidation cycle that can take months and cost more than the original system installation.

For plant managers receiving end-of-support notices from Rockwell or facing corporate IT pressure to retire legacy platforms, the practical question is not whether to migrate eventually — it is whether to migrate on a planned schedule or under emergency conditions following an unplanned failure. A verified spare 1756-EN2TR/C converts the second scenario into the first.

How to Extend Your ControlLogix Asset Life by 5–10 Years

Industrial automation infrastructure is not subject to the same obsolescence curve as commercial electronics. A ControlLogix chassis commissioned in 2010, with properly maintained communication and I/O modules, can operate reliably through 2030 and beyond. The constraint is not the platform — it is the availability of critical spare components. The 1756-EN2TR/C is one of those components.

The following maintenance strategy is applicable to any facility operating legacy ControlLogix systems under retirement pressure:

None of these steps require capital expenditure approval. They are operational maintenance decisions that protect existing capital assets — the category of action that separates facilities with sustained high uptime from those that absorb recurring unplanned shutdown costs.

Condition & Reliability Assurance

Sourcing discontinued industrial hardware from unverified channels carries documented risk: electrolytic capacitor degradation, firmware version mismatches, corroded backplane connectors, and counterfeit assemblies are known failure modes in the secondary market for legacy Rockwell modules. DriveKNMS applies a 5-step inspection protocol to every 1756-EN2TR/C unit before dispatch review.

1. Electrolytic Capacitor Assessment: Visual and ESR-based inspection for capacitor bulging, leakage, or elevated equivalent series resistance — the primary aging failure mode in modules stored beyond five years.
2. Firmware Version Verification: Each unit is powered and the firmware revision is confirmed and documented. Revision C firmware is verified against known valid build identifiers before the unit is cleared for sale.
3. Backplane Connector and Pin Inspection: All backplane edge connector pins are inspected under magnification for oxidation, mechanical deformation, and contamination. Units with affected pins are cleaned or rejected — not reworked and passed.
4. Ethernet Port Integrity Test: Both RJ-45 ports are tested for link establishment, auto-negotiation, and DLR ring supervisor function under powered conditions.
5. Functional Power-On Test: The module is installed in a 1756 chassis and confirmed to enumerate correctly on the backplane before packaging for shipment.

Units that do not pass all five stages are not sold. Condition is documented and disclosed at point of sale. Inspection records are available on request prior to shipment.

Key Features for System Maintenance

How do I confirm the unit is genuine and not counterfeit?
Every unit shipped by DriveKNMS includes documentation of the pre-shipment inspection, firmware version confirmation, and serial number. We source from decommissioned OEM equipment and authorized secondary market channels. Customers may request inspection photos and documentation prior to shipment.

Can this module be used with Studio 5000 Logix Designer?
Yes, with the caveat that newer versions of Studio 5000 may prompt a firmware upgrade during project download. Consult a qualified Rockwell integrator before performing any firmware update on a production system.