Allen-Bradley 1756-EN2TXT EtherNet/IP Bridge Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-EN2TXT is a ControlLogix® platform EtherNet/IP communication bridge module designed for extreme-temperature environments (Logix XT series). It enables high-speed EtherNet/IP connectivity between ControlLogix chassis and plant-floor devices, SCADA systems, and peer controllers in harsh industrial conditions where standard modules cannot operate reliably.
This page is your complete replacement and equivalent selection guide for the 1756-EN2TXT. Whether you are sourcing a direct drop-in replacement, evaluating a functional equivalent, or comparing cross-brand alternatives, the information below will help you make a confident, compatible choice. Buyers searching for a 1756-EN2TXT substitute or equivalent EtherNet/IP bridge will find all critical decision criteria here.
Technical Specifications
| Part Number | 1756-EN2TXT |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | ControlLogix® Logix XT (Extreme Temperature) |
| Protocol | EtherNet/IP (CIP) |
| Network Speed | 10/100 Mbps, auto-negotiate, full/half duplex |
| Ports | 2 × RJ-45 (dual-port, Device Level Ring / linear/star topology) |
| Operating Temperature ⚠️ | -25 °C to +70 °C (key differentiator for replacement decisions) |
| Storage Temperature | -40 °C to +85 °C |
| Backplane Current Draw | 1.0 A @ 5 VDC; 3.0 mA @ 24 VDC |
| Connections (max) | 256 CIP connections |
| I/O Messaging | Produced/consumed tags, explicit messaging, DLR support |
| Firmware | Updateable via ControlFlash |
| Certifications | UL, CE, cUL, ATEX (zone 2), Class I Div 2 |
| Form Factor | 1756 ControlLogix chassis module (1-slot) |
| Weight | ~450 g |
⚠️ The extended temperature range is the most critical parameter when evaluating any replacement or equivalent model.
Compatible Replacement & Equivalent Models
1. Direct Drop-in Replacements (same form, fit, function)
- 1756-EN2T – Standard-temperature variant (0 °C to +60 °C). Drop-in replacement only if ambient temperature is within standard range. Identical backplane pinout and firmware.
- 1756-EN2TR – Standard-temp with Device Level Ring (DLR) support. Suitable substitute if DLR topology is required and temperature is within 0–60 °C.
- 1756-EN2TRXT – XT variant with DLR. True drop-in equivalent for 1756-EN2TXT when DLR ring topology is also needed in extreme-temperature environments.
2. Functional Equivalents (same protocol, different generation or form factor)
- 1756-EN3TR – Next-generation dual-port EtherNet/IP module with enhanced diagnostics and higher connection count (500 connections). Functional equivalent for new installations; verify firmware compatibility with existing Logix project.
- 1756-ENBT – Legacy single-port EtherNet/IP bridge. Functional equivalent for older systems; lower connection count (128). Not recommended for new designs.
3. Cross-Brand Alternatives (different manufacturer, compatible protocol)
- Siemens CP 343-1 / CP 443-1 – EtherNet/IP-capable communication processors for S7-300/400. Cross-brand alternative requiring gateway configuration; not a physical substitute.
- Moxa MGate EIP3000 series – EtherNet/IP gateway for non-AB PLCs. Suitable as a protocol bridge in mixed-brand architectures.
⚠️ Always verify operating temperature, connection count, topology support, and Logix firmware version before finalizing any replacement or equivalent selection. Contact Konmask for a compatibility review.
Why Choose the Original 1756-EN2TXT
- Certified Extreme Temperature Performance: Factory-rated to -25 °C / +70 °C — no derating, no workarounds required for harsh environments.
- Full Rockwell Certification: UL, CE, ATEX Zone 2, and Class I Div 2 certifications ensure regulatory compliance in hazardous locations.
- Seamless ControlLogix Compatibility: Native backplane integration with all 1756 chassis; zero configuration overhead versus cross-brand alternatives.
- Rockwell Technical Support: Full OEM support, ControlFlash firmware updates, and TechConnect service contract eligibility.
- Warranty & Traceability: Genuine modules carry OEM warranty and full serialization for asset management and audit compliance.
- Long-Term Availability: Active product lifecycle with Rockwell Automation; spare parts and repair services available through authorized channels including Konmask.
Typical Applications
- Oil & Gas: Wellhead control panels and pipeline SCADA in sub-zero or high-ambient environments requiring ATEX/Div 2 certification.
- Mining: Underground conveyor and ventilation control systems exposed to wide temperature swings and dust.
- Outdoor Utilities: Substation automation and water/wastewater treatment plants with unheated enclosures.
- Cold Storage & Food Processing: Refrigerated warehouse automation where standard modules fail below 0 °C.
- Steel & Metals: Furnace area control networks where ambient temperatures exceed standard module ratings.
- Automotive Manufacturing: Paint booth and body shop automation with solvent-rich, temperature-variable environments.
System Compatibility
- 1756-A7XT / 1756-A13XT – ControlLogix XT chassis (7-slot / 13-slot), required for XT module installation
- 1756-PA75R / 1756-PB75R – ControlLogix redundant power supplies compatible with XT chassis
- 1756-L7x / 1756-L8x – ControlLogix L7 and L8 series CPUs (Logix 5570 / 5580)
- 1756-DNB – DeviceNet bridge module for mixed-network architectures
- 1783-ETAP / 1783-ETAP2F – EtherNet/IP Tap for DLR topology monitoring
- Studio 5000 Logix Designer v21+ – Required software for configuration and online programming
Selection Guide
Answer these three questions to confirm the 1756-EN2TXT is the right module — or to identify the best replacement/equivalent:
- What is the actual ambient operating temperature range of your installation? If it falls within 0–60 °C, a standard 1756-EN2T or EN2TR may be a cost-effective equivalent. If it goes below 0 °C or above 60 °C, the XT variant is mandatory.
- Does your network topology require Device Level Ring (DLR)? If yes, select the 1756-EN2TRXT (XT + DLR) rather than the 1756-EN2TXT (XT, no DLR).
- What is your target connection count and Logix firmware version? Higher connection requirements may point to the 1756-EN3TR as a functional equivalent. Firmware compatibility must be verified against your existing Logix project.
Not sure? Contact Konmask at [email protected] or +0086 19859288691 — our engineers will review your system and recommend the optimal module.
Quality Assurance & Sourcing
Konmask sources the 1756-EN2TXT through verified industrial surplus, authorized distributor channels, and OEM-certified refurbishers. Every unit undergoes a 4-step inspection process:
- Visual & Physical Inspection: Enclosure integrity, label authenticity, connector condition, and serial number verification.
- Firmware & Boot Test: Module powered in a live 1756 chassis; firmware version confirmed and backplane communication verified.
- Functional Network Test: EtherNet/IP connectivity validated; CIP connection establishment and I/O messaging confirmed.
- Documentation Package: Test report issued with each unit.
Available documentation upon request: test reports, certificate of conformance, photos of actual unit, and traceability records.
How to Order
- Submit Your Inquiry: Email [email protected] with part number, quantity, required delivery date, and any compatibility questions.
- Receive Quote & Availability Confirmation: Konmask responds within 24 hours with pricing, lead time, and stock status.
- Confirm & Ship: Order confirmed upon payment; units shipped with full documentation and tracking.
Replacement & Compatibility FAQ
Q: Can the 1756-EN2T replace the 1756-EN2TXT?
A: Yes, as a functional equivalent — but only if your installation temperature stays within 0 °C to +60 °C. The 1756-EN2T is not a certified substitute in environments below 0 °C or above 60 °C where the XT rating is required.
Q: Is the 1756-EN2TRXT compatible with the same chassis as the 1756-EN2TXT?
A: Yes. Both modules are compatible with 1756 XT chassis (e.g., 1756-A7XT). The EN2TRXT adds DLR ring topology support and is a direct equivalent for applications requiring that feature.
Q: Are there cross-brand equivalents or substitutes for the 1756-EN2TXT in Siemens or Mitsubishi systems?
A: There is no direct physical substitute across brands due to proprietary backplane design. Cross-brand alternatives such as Siemens CP modules or Moxa gateways can replicate EtherNet/IP communication functionality but require additional engineering integration. Contact Konmask for a cross-brand compatibility assessment.
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