Allen‑Bradley 1756-ENBTControlLogix EtherNet/IP Bridge Communication Module

Product Brief IntroductionThe 1756-ENBT is an entry-level EtherNet/IP communication bridge module for the ControlLogix platform. It provides single-port 10/100Mbps Ethernet connectivity, enabling data exchange between ControlLogix controllers and Ethernet-based devices, and supports basic CIP messaging and I/O control for small to medium automation systems.
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Technical Specifications

Ethernet interface: 1×RJ45 copper port, 10/100Mbps auto-negotiation. Communication protocols: EtherNet/IP, TCP/IP, CIP. Maximum TCP connections: 64. Maximum CIP connections: 128. Current draw: 700mA @ 5.1V DC, 3mA @ 24V DC. Power dissipation: 3.7W. Thermal dissipation: 12.6 BTU/hr. Isolation voltage: 30V continuous, basic insulation between network and backplane. Operating temperature range: 0°C to +60°C. Storage temperature range: -40°C to +85°C. Slot width: 1.

Functional Features

It delivers basic EtherNet/IP communication for program upload/download, data messaging, and remote monitoring. Front panel status indicators provide network and module status information. It supports BOOTP/DHCP IP configuration and electronic keying for module identification. Low power consumption reduces system heat load.

Application Scenarios

It applies to small and medium-sized automation systems, remote I/O chassis connections, programming terminal connectivity, basic SCADA integration, and legacy ControlLogix system network upgrades.

Performance Parameters

Communication rate: 10/100Mbps auto-sensing. Maximum TCP connections: 64. Maximum CIP connections: 128. Power dissipation: 3.7W. Operating temperature range: 0°C to +60°C. Vibration resistance: 2G @ 10Hz to 500Hz. Shock resistance: 30G.

Structural Characteristics

It adopts standard single-slot ControlLogix package with metal shielding housing, front panel RJ45 Ethernet port, status LED indicators, and backplane communication connector.

Working Principle

It functions as a protocol converter between the ControlLogix backplane bus and the EtherNet/IP network, translating data formats and transmitting control instructions and process data between the controller and networked devices to realize system networking.

Installation Requirements

Install in any available slot of a ControlLogix chassis. Use Category 5 twisted pair Ethernet cable. Configure IP address via BOOTP utility or manual programming. Ensure reliable system grounding. Keep away from strong electromagnetic interference sources.




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