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

Technical Dossier

Product Details And Specifications

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

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

Solving the Critical Spare Hardware Challenge

The Allen-Bradley 1756-EN2TR is deployed across thousands of ControlLogix installations in automotive, oil & gas, food & beverage, and water treatment facilities worldwide. Its dual-port DLR capability makes it the standard choice for fault-tolerant network topologies where a single cable break cannot be permitted to halt production.

Facilities that have extended the service life of their ControlLogix systems by 5–10 years beyond the original design horizon share a common practice: they maintain a minimum of two spare 1756-EN2TR units on-site, sourced independently of the OEM channel. This single procurement decision has, in documented cases, prevented full system replacements that were being driven not by functional obsolescence but by parts unavailability.

Compatible legacy systems include: Allen-Bradley ControlLogix L6x, L7x, and L8x series processors; existing DLR ring topologies; SCADA and MES integrations built on EtherNet/IP protocol.

Condition & Reliability Assurance

• Step 1 – Visual & Physical Inspection: Backplane connector pin integrity check; housing inspection for cracks, burn marks, or corrosion on RJ-45 ports and board surfaces.
• Step 2 – Capacitor Health Assessment: Electrolytic capacitor inspection for bulging, leakage, or ESR deviation — a primary failure mode in modules stored beyond 5 years.
• Step 3 – Firmware Version Verification: Firmware revision is documented and disclosed. Customers requiring a specific revision for compatibility with existing RSLogix 5000 / Studio 5000 projects are advised to confirm prior to order.
• Step 4 – Functional Communication Test: Module is bench-tested for EtherNet/IP communication response and DLR port functionality where test infrastructure permits.
• Step 5 – Packaging & ESD Protection: Units are shipped in anti-static packaging with desiccant. Condition grade (New, Refurbished-Grade A, or Tested-Used) is clearly stated on the invoice.

Key Features for System Maintenance

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.

Q: How do I confirm the unit is genuine Allen-Bradley and not a counterfeit?
A: All units are sourced through traceable supply channels. We provide documentation of unit origin upon request. Customers are encouraged to verify the catalog label, series letter, and firmware revision against Rockwell Automation's published records upon receipt.

Q: Can you support multi-unit or repeat RFQ requests?
A: Yes. Send the model list, target quantity and destination so DRIVEKNMS can review sourcing options and quote the requirement as a project RFQ.

Q: What if I need a specific firmware revision for compatibility?
A: Firmware revision compatibility is a legitimate concern for DLR ring configurations and specific Studio 5000 project versions. Disclose your required revision at the time of inquiry and we will confirm availability before committing to supply.

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.