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PLC, I/O & HMI
1756-ENBT
Allen-Bradley
Allen-Bradley 1756-ENBT 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-ENBT
- Series / type
- Confirm against nameplate
- Condition
- Confirm with inquiry
- Quantity
- Confirm with inquiry
- Lead time
- Confirm with inquiry
Product information
Product Overview
The 1756-ENBT is a first-generation EtherNet/IP bridge module for the ControlLogix 1756 platform — 10/100 Mbps RJ45 interface with 64 TCP connections and 128 CIP connections (64 + 64 CIP unconnected messages per side). Rockwell’s official lifecycle status is Discontinued, with repair options available. It was the standard Ethernet route for 5561/5570-era ControlLogix systems and remains one of the most frequently searched spare-part numbers in the installed base.
Technical Specifications (Official Rockwell Data)
| Product family | ControlLogix communication module (first-generation EtherNet/IP) |
|---|---|
| Network | EtherNet/IP |
| Interface | 1 × copper RJ45, 10/100 Mbps (Cat 5) |
| TCP connections, max | 64 |
| CIP connections, max | 128 |
| CIP unconnected messages | 64 + 64 (backplane + Ethernet) |
| Current draw | 700 mA @ 5.1 V DC, 3 mA @ 24 V DC |
| Power dissipation | 3.7 W (12.6 BTU/h) |
| Operating temperature | 0…60 °C (32…140 °F) |
| Isolation | 30 V continuous, basic insulation, Ethernet to backplane |
| EFT/B immunity | ±2 kV @ 5 kHz on Ethernet ports |
| Lifecycle status (Rockwell) | Discontinued; repair options available |
Lifecycle Status & Availability
Rockwell officially lists the 1756-ENBT as Discontinued. The active replacement is the 1756-EN2T (double the connection capacity, same slot format). Discontinued status makes the ENBT a high-demand spare part: lines locked to first-generation Ethernet baselines still run millions of these modules worldwide, and buyers typically either source exact-revision spares or plan a controlled upgrade to EN2T.
Typical Applications
- Emergency replacement for failed Ethernet bridges in 5561/5570-era systems
- Revision-matched spares where a firmware jump to EN2T would require a controlled change procedure
- Bridge inventory during staged migrations from ENBT to EN2T/EN4TR
Related & Compatible Models
Direct successor: 1756-EN2T (Active, 128 TCP / 256 CIP). Ring-redundant successors: 1756-EN2TR / EN4TR. Used with ControlLogix 5561/5570 controllers (L6x/L7x families) and compatible with the whole 1756 chassis range.
Requesting a Quotation
For a discontinued module, revision matching is critical. Send a nameplate photo with the full catalog number, series letter and firmware revision, plus quantity. This page carries official Rockwell data only; stock, condition and price are confirmed per quotation.
Frequently Asked Questions
Is the 1756-ENBT discontinued?
Yes — Rockwell’s official lifecycle status is Discontinued (repair options available). The active replacement is 1756-EN2T. Remaining-stock availability is verified per request.
What should I replace it with?
The 1756-EN2T is slot-compatible and doubles connection capacity. For ring-redundant or Gigabit needs, see 1756-EN2TR or 1756-EN4TR. Verify firmware/AOP compatibility with your controller before cutover.
Why would I buy a discontinued module instead of upgrading?
Because many plants freeze Ethernet-bridge firmware baselines: swapping to EN2T can require program-side changes, AOP updates and a validation window. A revision-matched ENBT spare keeps the line running today while the upgrade is scheduled.
How do I confirm which revision I have?
The series letter and firmware revision are printed on the module label. A clear nameplate photo attached to your quotation request is the most reliable way to get a matched unit.
MODEL INQUIRY
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Include a nameplate photo or full specification when revisions may differ.