Overview
The Allen-Bradley 1756-ENBT is a ControlLogix EtherNet/IP communication bridge module designed for high-speed Ethernet networking in industrial control systems. This module provides 1-port EtherNet/IP communication supporting 10/100 Mbps Ethernet and delivers 128 CIP connections for EtherNet/IP communication. As a legacy module, it occupies 1 slot in the ControlLogix chassis. This module enables distributed I/O, inter-controller messaging, and connectivity to HMIs and SCADA systems over standard Ethernet networks.
Key Features
- Handles up to 64 TCP and 128 CIP connections for efficient data exchange between controllers, I/O modules, and other devices on an EtherNet/IP network
- Supports 10/100 Mbps communication rates in half or full duplex mode through a single RJ45 port and includes a USB 1.1 port for configuration
- Web-enabled with diagnostic tools and configuration access via standard web browser
- Supports both implicit (I/O) and explicit (messaging) communication using the Common Industrial Protocol (CIP) for seamless integration of real-time control
- Compact form factor for space-constrained control cabinets
Technical Specifications
- Communication Rate: 10/100 Mbps
- Ethernet Port: 1 RJ45 Category 5
- Network Type: EtherNet/IP
- TCP Connections: 64
- CIP Connections: 128 CIP connections
- Current Draw @ 5.1 VDC: 700 mA
- Power Dissipation: 3.7 W
- Operating Temperature: 0 to 60°C (32 to 140°F)
- Storage Temperature: -40 to 85°C (-40 to 185°F)
- Humidity: 5% to 95% non-condensing
- Dimensions: 140 × 40 × 118 mm (5.51 × 1.57 × 4.65 inches)
- Weight: 0.23 kg (0.51 lbs)
- Certifications: UL Listed, CSA Certified, CE Marked, ATEX Certified
- Series: ControlLogix
- Module Status Indicators: Module Status, Network Status, Link Status, Activity Status
Typical Applications
- ControlLogix chassis gateway configurations for bridging multiple Ethernet networks
- Industrial Ethernet integration for distributed I/O and remote devices
- Inter-controller communication over EtherNet/IP networks
- Integration of HMIs, SCADA systems, and programming stations
- Manufacturing systems requiring deterministic Ethernet communication
- Food, beverage, automotive, and pharmaceutical automation environments
Compatibility & Replacements
Compatible With
- ControlLogix 1756 Modular Chassis (1756-A4, 1756-A10, 1756-A13, 1756-A17)
- RSLogix 5000 software and Studio 5000 Logix Designer application for programming
- Studio 5000 Engineering and Design Environment
- EtherNet/IP networks and devices supporting CIP protocol
- FactoryTalk View HMI software
- Rockwell CompactLogix and GuardLogix systems with EtherNet/IP support
Replaces / Drop-In Replacement For
- Older Allen-Bradley 1756-ENBT revision A units
- Legacy 1756-EWEB web server module (in gateway configurations)
- Note: The 1756-ENBT was discontinued as of December 31, 2021, with functional replacement product being 1756-EN2T
Works With
- EtherNet/IP Protocol (IEC 61158 Type 2)
- Common Industrial Protocol (CIP) – explicit and implicit messaging
- Studio 5000 Logix Designer / RSLogix 5000
- FactoryTalk software suite
- Standard Ethernet infrastructure (Category 5 or higher)
- Web browsers for configuration and diagnostics
