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

Technical Dossier

Product Details And Specifications

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

DriveKNMS reviews sourcing options for this model through RFQ handling before quotation.

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/B was deployed extensively in process industries — oil & gas, automotive, food & beverage, and water treatment — during the period when Device Level Ring (DLR) topology became the standard for fault-tolerant EtherNet/IP networks. Facilities that built their control architecture around this module now face a specific problem: Rockwell Automation has discontinued it, and the current-generation replacement (1756-EN2T or 1756-EN3TR) is not always a drop-in substitute in older firmware environments.

How to extend your ControlLogix asset life by 5–10 years without a platform migration:

Condition & Reliability Assurance

Sourcing discontinued industrial hardware from the secondary market carries inherent risk. DriveKNMS applies a structured 5-step qualification process to every 1756-EN2TR/B unit before it is offered for sale.

1. Visual and mechanical inspection: Examination of the module housing, backplane connector pins, and RJ-45 port contacts for corrosion, mechanical damage, and counterfeit indicators (label quality, casting marks, serial number format).
2. Electrolytic capacitor assessment: Aged electrolytic capacitors are the most common latent failure mode in modules that have been in storage or light-duty service for extended periods. Units showing signs of capacitor bulge or electrolyte leakage are rejected.
3. Firmware version verification: The installed firmware version is recorded and disclosed. Buyers operating specific RSLogix 5000 versions can confirm compatibility before dispatch review.
4. Pin corrosion and contact resistance check: Backplane connector pins are inspected under magnification. Oxidized pins are treated or the unit is rejected, depending on severity.
5. Functional power-on test: Where test bench infrastructure permits, modules are powered and link-state verified on both Ethernet ports prior to packaging.

Condition is disclosed accurately — new surplus, tested refurbished, or as-removed — and reflected in pricing. No unit is represented as new unless it is factory-sealed with verifiable provenance.

Key Features for System Maintenance

Q: How do I confirm the unit is genuine and not counterfeit?
A: We disclose the full inspection record for each unit, including serial number, firmware version, and condition grade. Buyers are encouraged to cross-reference the serial number with Rockwell Automation's product authentication resources. We do not sell units that fail our counterfeit screening criteria.