1756-ENBT Allen-Bradley ControlLogix EtherNet/IP Network Module

Product Overview

The Allen-Bradley 1756-ENBT is a ControlLogix EtherNet/IP communication bridge module engineered by Rockwell Automation. This interface card establishes high-speed network links between ControlLogix chassis, decentralized I/O systems, and enterprise architectures.

Functional Operation

This communication card transmits critical control data across standard plant networks via the Common Industrial Protocol (CIP). It enables high-speed messaging, distributed I/O control, and real-time data collection from various industrial devices. The unit slots directly into any available position within a standard ControlLogix chassis. Consequently, plant engineers can deploy peer-to-peer interlocking systems between separate automation zones. The module also facilitates configuration transitions by bridging data seamlessly across the chassis backplane to alternative networks like ControlNet or DeviceNet.

Network Architecture and Security Capabilities

The adapter automatically negotiates link speeds of either 10 Mbps or 100 Mbps via its single RJ45 port. It manages up to 128 concurrent Logix communication connections to maximize data transmission capacity. Additionally, the network card supports CIP Safety bridging protocols alongside standard data packets. This feature permits secure data transmission between integrated GuardLogix safety controllers across multiple production areas. The device utilizes standard internal backplane current without requiring external power wiring during installation.

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Model Number: 1756-ENBT
• Product Type: EtherNet/IP Communication Bridge Module
• Network Transmission Rate: 10/100 Mbps, auto-sensing
• Maximum Logix Connections: 128 connections
• Maximum TCP/IP Connections: 64 connections
• Ports: 1 RJ45 Ethernet port
• Backplane Current Draw at 5.1V DC: 700 mA
• Backplane Current Draw at 24V DC: 3 mA
• Maximum 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)
• Relative Humidity: 5 to 95% non-condensing
• Module Dimensions: 5.7 x 10.5 x 13.0 cm
• Net Weight: 0.2 kg
• Country of Origin: United States
• Harmonized Tariff Code (HS Code): 8517620050