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PLC, I/O & HMI
1756-EN2T
Allen-Bradley
Allen-Bradley 1756-EN2T sourcing reference. Send the complete nameplate details and required quantity for review.
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Reference details
- Manufacturer / brand
- Allen-Bradley
- Model / reference
- 1756-EN2T
- Series / type
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- Condition
- Confirm with inquiry
- Quantity
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- Lead time
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Product information
Product Overview
The 1756-EN2T is the standard EtherNet/IP bridge module for the ControlLogix 1756 platform. It connects a 1756 chassis to 10/100 Mbps twisted-pair Ethernet networks and supports 128 TCP connections and 256 CIP connections, with 128 + 128 CIP unconnected messages per side (backplane and Ethernet). For 5570/5561-generation controllers without an embedded port, the EN2T is the primary route to EtherNet/IP; in 5580-based systems it remains useful for adding an independent second Ethernet network.
Technical Specifications (Official Rockwell Data)
| Product family | ControlLogix communication module |
|---|---|
| Network | EtherNet/IP |
| Interface | 1 × copper RJ45, 10/100 Mbps (IEEE 802.3 Cat 5) |
| TCP connections, max | 128 |
| CIP connections, max | 256 |
| CIP unconnected messages | 128 + 128 (backplane + Ethernet) |
| Current draw | 1 A @ 5.1 V DC, 3 mA @ 24 V DC |
| Power dissipation | 5.1 W (17.4 BTU/h) |
| Operating temperature | 0…60 °C (32…140 °F) |
| Storage temperature | -40…85 °C (-40…185 °F) |
| Isolation | 30 V continuous, basic insulation, Ethernet/USB to backplane |
| Slot width | 1 |
| Product series | Series D |
| Lifecycle status (Rockwell) | Active |
Lifecycle Status & Availability
Rockwell lists the 1756-EN2T as Active (Series D). It is the current-generation 100 Mbps EtherNet/IP bridge for the 1756 platform, superseding the discontinued 1756-ENBT (64 TCP / 128 CIP connections). Gigabit-class networking inside the controller itself arrived with the ControlLogix 5580 embedded port.
Typical Applications
- Adding EtherNet/IP to 5570/5561-generation ControlLogix controllers without embedded ports
- Creating an independent machine-level Ethernet network alongside a 5580 controller’s embedded port
- Bridging remote I/O adapters, drives and HMI panels to the ControlLogix backplane
Related & Compatible Models
Direct predecessor: 1756-ENBT (discontinued, 64 TCP / 128 CIP). Higher-density siblings: 1756-EN2TR (with Device Level Ring redundancy) and 1756-EN4TR (4-port Gigabit with ring support) for network-resilient topologies. Works with all 1756 controllers and chassis.
Requesting a Quotation
Send the complete catalog number with series letter from the label (e.g. Series C vs D firmware differences matter), required quantity, and whether you need ring-redundancy capability (EN2TR) so the correct variant is quoted. Availability and pricing are confirmed individually by quotation.
Frequently Asked Questions
EN2T vs ENBT — can I swap directly?
The EN2T is the functional successor: same RJ45 10/100 Mbps interface, doubled connection capacity (128 TCP / 256 CIP vs 64/128). In most chassis it is a slot-compatible replacement, but firmware revision and AOP/EDS versions should be matched to your controller baseline — include your controller model and firmware in the quotation request.
How many devices can one EN2T handle?
Official ratings: 128 TCP connections and 256 CIP connections, with 128 + 128 CIP unconnected messages (backplane and Ethernet sides). Real capacity depends on your I/O update rates and message mix.
Does it support Gigabit Ethernet?
No — the EN2T is 10/100 Mbps. For Gigabit, use the 1756-EN4TR, or move to ControlLogix 5580 controllers whose embedded port runs at 1 Gbps.
Can I use it for CIP Safety?
The EN2T itself is a standard bridge. CIP Safety routing depends on the safety devices and controller in your system; confirm your safety architecture before ordering.
MODEL INQUIRY
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