Allen-Bradley 1756-EN2T ControlLogix EtherNet/IP Bridge Module 10/100 FE | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-EN2T is a ControlLogix EtherNet/IP communication bridge module supporting 10/100 Mbps Fast Ethernet. It enables seamless integration of ControlLogix systems into EtherNet/IP networks, providing high-speed, deterministic communication for industrial automation environments. This page serves as a comprehensive selection, replacement, and compatibility reference for engineers and procurement teams.
Technical Specifications
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Part Number: 1756-EN2T
- Series: ControlLogix
- Communication Protocol: EtherNet/IP
- Network Speed: 10/100 Mbps Fast Ethernet (FE)
- Port Type: RJ-45 (single port)
- Backplane Current Draw: 1.0 A @ 5 VDC
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5% to 95% (non-condensing)
- Chassis Compatibility: 1756 ControlLogix chassis
- Firmware: Upgradeable via ControlFLASH
- Certifications: UL, CE, cUL
- Form Factor: Single-slot ControlLogix module
Compatible Replacement & Equivalent Models
When the 1756-EN2T is unavailable or end-of-life, the following models are commonly used as direct or functional replacements:
- 1756-EN2TR — Dual-port ring topology variant; drop-in replacement with added DLR support. Recommended upgrade path.
- 1756-EN2TXT — Extended-temperature version (-25°C to 70°C); suitable for harsh environments.
- 1756-EN2TRXT — Dual-port + extended temperature; highest-spec replacement.
- 1756-EN3TR — Gigabit Ethernet (1 Gbps) dual-port; for high-bandwidth applications requiring future-proofing.
- 1756-ENBT — Legacy predecessor; single-port 10/100 FE, older firmware baseline. Not recommended for new designs.
- 1756-EN2F — Fiber optic variant (100 Mbps); for long-distance or EMI-sensitive installations.
Note: Always verify firmware compatibility and chassis slot requirements before substitution. Contact Konmask for pre-sales compatibility verification.
Why Choose the Original Model
- Proven reliability in millions of installed ControlLogix systems worldwide.
- Native EtherNet/IP support with CIP (Common Industrial Protocol) compliance — no gateway required.
- Rockwell Software integration: fully supported in Studio 5000 Logix Designer and RSLinx Classic.
- Deterministic communication for time-sensitive motion and process control applications.
- Broad ecosystem support: compatible with Stratix switches, Kinetix drives, PowerFlex VFDs, and third-party EtherNet/IP devices.
- Long service history with extensive field documentation, spare parts availability, and Rockwell TechConnect support.
Typical Applications
- Automotive assembly line control and robot cell integration
- Oil & gas SCADA and DCS integration via EtherNet/IP
- Food & beverage packaging line automation
- Pharmaceutical batch process control (FDA 21 CFR Part 11 environments)
- Water/wastewater treatment plant PLC networking
- Power generation and utility substation automation
- Material handling and conveyor system control
- Building automation and HVAC integration
System Compatibility
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17 (all standard ControlLogix chassis)
- Controllers: 1756-L6x, 1756-L7x, 1756-L8x series Logix controllers
- Software: Studio 5000 Logix Designer v21+, RSLogix 5000 v16+, RSLinx Classic v2.57+
- Network Switches: Stratix 5700, 5400, 8000; Cisco IE series; unmanaged switches (limited features)
- Protocols: EtherNet/IP (CIP), Modbus TCP (via gateway), SNMP v1/v2c for network management
- I/O Adapters: 1734 POINT I/O, 1769 CompactLogix I/O, 1756 ControlLogix I/O over EtherNet/IP
Selection Guide
Use the following criteria to determine whether the 1756-EN2T is the right module — or which replacement best fits your application:
- Single-port, standard temp, 10/100 Mbps, linear topology → 1756-EN2T (this model)
- Need Device Level Ring (DLR) redundancy → Upgrade to 1756-EN2TR
- Operating below 0°C or above 60°C → Select 1756-EN2TXT or 1756-EN2TRXT
- Gigabit bandwidth required (>100 Mbps throughput) → Select 1756-EN3TR
- Long cable runs (>100 m) or high EMI environment → Select 1756-EN2F (fiber)
- Legacy system maintenance only → 1756-ENBT (not recommended for new projects)
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels with full traceability.
- Each module undergoes visual inspection, label verification, and functional power-on testing prior to shipment.
- Counterfeit detection protocols applied: hologram verification, PCB marking cross-check, firmware version validation.
- Original factory packaging preserved where available; anti-static packaging used for all shipments.
- Certificate of Conformance (CoC) and test reports available upon request.
- Warranty: 90-day replacement warranty on all stocked units.
How to Order
- Part Number: 1756-EN2T
- Add to cart directly on this page, or contact us for bulk/project pricing.
- Lead time: In-stock units ship within 1–3 business days; sourced units 5–15 business days.
- Payment: T/T (wire transfer), PayPal, credit card, and trade credit (approved accounts).
- Export: We ship worldwide. Export documentation (commercial invoice, packing list, COO) provided.
- RFQ: Email support@konmask.com with quantity, required delivery date, and project details.
Replacement & Compatibility FAQ
Q: Is the 1756-EN2TR a direct drop-in replacement for the 1756-EN2T?
A: Yes. The 1756-EN2TR is backward compatible and fits the same chassis slot. It adds a second RJ-45 port and DLR support. No firmware changes are required on the controller side for basic operation.
Q: Can I use the 1756-EN2T with a CompactLogix system?
A: No. The 1756-EN2T is designed exclusively for the 1756 ControlLogix chassis. For CompactLogix, use the built-in Ethernet port on 1769-L3x/L4x/L5x controllers or a 1769-AENTR adapter.
Q: What is the maximum number of 1756-EN2T modules per chassis?
A: There is no hard limit per chassis, but backplane current budget and controller connection limits apply. Typically 1–4 modules per chassis in most applications.
Q: Does the 1756-EN2T support PROFINET or Modbus TCP natively?
A: No. It supports EtherNet/IP (CIP) natively. Modbus TCP and PROFINET require a third-party gateway or protocol converter.
Q: How do I update the firmware on a 1756-EN2T?
A: Use Rockwell Automation’s ControlFLASH or ControlFLASH Plus utility. Firmware files are available via the Rockwell Automation Product Compatibility and Download Center (PCDC).
Q: Is the 1756-EN2T still in production?
A: Rockwell Automation has transitioned to newer variants (EN2TR, EN3TR). The 1756-EN2T may be available as new-surplus or refurbished stock. Contact Konmask for current availability.
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