The Allen-Bradley 1756-ENBT is an EtherNet/IP communication bridge module used in the ControlLogix PLC system from Rockwell Automation. It provides Ethernet connectivity between ControlLogix controllers and industrial devices such as HMIs, SCADA systems, drives, and distributed I/O.
It is one of the earlier Ethernet modules in the ControlLogix platform and supports 10/100 Mbps copper Ethernet communication (RJ45).
The 1756-ENBT is widely used in industrial automation systems for real-time data exchange and system integration across Ethernet networks.
Technical Specifications
| Parameter | Details |
|---|---|
| Product Type | EtherNet/IP Communication Module |
| Model | 1756-ENBT |
| System Compatibility | Allen-Bradley ControlLogix |
| Network Type | EtherNet/IP |
| Communication Speed | 10/100 Mbps |
| Port Type | 1 × RJ45 Ethernet (copper) |
| Protocols | EtherNet/IP, TCP/IP |
| Max TCP Connections | 64 |
| Max CIP Connections | 128 |
| Backplane Interface | ControlLogix chassis backplane |
| Power Consumption | ~3.7 W |
| Current Draw | ~700 mA @ 5.1 V DC |
| Isolation Voltage | 30 V continuous |
| Installation Type | Chassis slot-mounted module |
| Operating Temperature | 0°C to 60°C |
The module supports Ethernet-based control, diagnostics, and I/O communication within a ControlLogix system.
Physical Dimensions & Weight
- Dimensions (H × W × D): 53 mm × 182 mm × 235 mm
- Weight: ~0.32 kg
Compact single-slot module designed for standard ControlLogix chassis installation.
Function in ControlLogix System
The 1756-ENBT is used to:
- Connect ControlLogix controllers to EtherNet/IP networks
- Enable communication with PLCs, HMIs, SCADA systems, and drives
- Support real-time I/O messaging and data transfer
- Integrate distributed industrial systems over Ethernet
- Provide network access for diagnostics and monitoring
Recommended Related Models
- Allen-Bradley 1756-EN2T (newer copper Ethernet module)
- Allen-Bradley 1756-EN2TR (dual-port DLR module)
- Allen-Bradley 1756-EN2F (fiber Ethernet module)
- Allen-Bradley 1756-CNB / CN2 ControlNet modules
- Allen-Bradley 1756-L7x / L8x ControlLogix controllers
