Allen-Bradley 1756-EN2TXT | Direct Replacement for EN2T

Description

Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.

3. Product Introduction

As the extended-temperature member of the 1756-EN2T family, the 1756-EN2TXT puts a single EtherNet/IP port into a ControlLogix chassis. It bridges the backplane to the network, letting the controller exchange tags with drives, remote I/O, and peer controllers. The coated board and wider ambient range suit cabinets where condensation and heat are part of the job. Match firmware before you swap — a module that boots can still reject the project if the revision sits outside the controller’s support matrix.

1756-EN2TXT

1756-EN2TXT

1756-EN2TXT

4. Key Technical Specifications

5. Field Application & Technical Pitfalls (The Engineer’s Guide)

Where this module is critical:

• Remote I/O over EtherNet/IP on packaging and assembly lines, where a single-port bridge ties a ControlLogix chassis to distributed I/O blocks and drives.
• Peer-to-peer controller messaging in material handling cells, where several ControlLogix processors exchange handoff tags over the plant network.
• Heat- and humidity-exposed cabinets where the conformal coating and extended ambient range keep the bridge alive when a standard module would corrode.

Three pitfalls that bite during replacement:

• Firmware revision and project compatibility. Warning: a module with a newer firmware revision can join the backplane, show a green OK LED, and still refuse the controller’s project if the revision sits outside the support matrix. Check the revision in the engineering tool before you mount the spare.
• IP address, subnet, and duplicate-node conflicts. Warning: a replacement carrying the old module’s IP is fine — a replacement carrying a test-bench IP is not. Confirm the address against the network drawing, and scan for duplicates before you energize. At 10/100 Mbps, a duplicate address turns into intermittent CIP timeouts that look like a failing bridge.
• Coating damage, RJ45 latch, and ESD. Warning: the conformal coating is the reason this module exists in harsh cabinets. Do not scrape it with a probe tip or clean it with solvent. Ground yourself before handling the board, and confirm the RJ45 latch clicks into the port — a partially seated cable produces link flapping that mimics a bad module.

Lesson learned: A technician replaced a failed bridge with a spare pulled from another line, powered up, and watched half the remote I/O drop offline every few minutes. Root cause — the spare carried a duplicate IP address and a firmware revision two steps behind the controller. The hardware was good; the identity and revision were not. Two hours of troubleshooting for a five-minute label and address check.

6. Quality Control (QC) SOP & Transparency

1. Inbound Verification. Each module is checked against the OEM packing list, label typography, serial number format, and date-code range. Firmware revision and coating condition are logged before the unit enters stock.
2. Live Rig Testing. The module is seated in a 1756 10-slot test chassis with a known-good ControlLogix controller and an EtherNet/IP test network. We power on, confirm backplane recognition, verify the OK LED, and run a tag exchange with a remote I/O simulator.
3. Parameter Testing. Backplane current draw, RJ45 link status, and isolation are checked against the OEM datasheet where published. Undocumented values are flagged for buyer confirmation rather than guessed.
4. Final QA & Packaging. The module ships in an anti-static bag with a QC-passed label, a test record showing the firmware revision we verified, and photos of the front-face label when available.

7. Frequently Asked Questions (FAQ)

Can I hot-swap this module in a live ControlLogix rack? Do not assume so. Some 1756 slots support live removal, but the OEM manual and your site procedure decide. If live removal is not explicitly permitted for that slot, remove rack power first.

Is it a direct replacement for the 1756-EN2T? Mechanically and functionally it fits the same slot, but firmware and connection limits decide whether your project accepts it. Send the old label photo and controller firmware revision, and we will confirm what we can before shipment.

What’s the warranty? 12 months from delivery for functional failure under normal operation. Cables and other consumables carry a 90-day replacement guarantee.

How can I tell genuine OEM from refurbished? Genuine units carry the original Allen-Bradley label with consistent typography and a traceable serial number. Refurbished units carry our QC tag in addition to the OEM label, and we disclose condition on the quote.

Does it support dual-port ring topology like the EN2TR? No — this is a single-port bridge. If your drawing calls for device-level ring or dual-port media redundancy, you need the dual-port member of the family, not the TXT single-port version.

Does it ship with a configuration file? No. We ship a test record, not your Studio 5000 project. The module must be configured with the correct IP address, subnet, and connection budget for your network.

What do you need to quote the right replacement? Controller firmware revision, old label photo, network drawing with IP addresses, and the connection count on the module. That five-minute upload prevents most wrong-part returns.