Allen-Bradley 1756-ENBT ControlLogix EtherNet/IP Bridge Communication Module

Product Description

The 1756-ENBT is a high-performance communication bridge designed for the Allen-Bradley ControlLogix platform. This module serves as a gateway between the ControlLogix backplane and an EtherNet/IP network, enabling high-speed data exchange, remote programming, and seamless integration with HMI/SCADA systems. It supports a wide range of industrial protocols, including messaging, I/O control, and distributed processing.

Engineered for reliability in demanding environments, the 1756-ENBT (Ser A/B) allows for real-time control of remote I/O chassis and drives. It features an integrated web server for module diagnostics and network statistics, accessible via any standard web browser. Its fanless, solid-state design ensures long-term operation within a standard ControlLogix 1756 chassis, making it a cornerstone of networked industrial automation architectures.

Detailed Technical Specifications

• Model Number: 1756-ENBT

• Brand: Allen-Bradley / Rockwell Automation

• Module Type: EtherNet/IP Communication Bridge

• Communication Rate: 10/100 Mbps (Auto-negotiation)

• EtherNet/IP Connections: 64 CIP connections; 128 TCP/IP connections

• I/O Packet Rate: 5,000 packets per second

• Backplane Current (5.1V DC): 700 mA

• Backplane Current (24V DC): 3 mA

• Power Dissipation: 3.7 Watts

• Connector Type: RJ45 Category 5

• Supported Protocols: EtherNet/IP, TCP/IP, UDP, SNMP, HTTP, BootP, DHCP

• Operating Temperature: 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit)

• Isolation Voltage: 30V (continuous), Basic Insulation Type

• Net Weight: 0.29 kg (0.64 lbs)

Industrial Application Scenarios

The 1756-ENBT is primarily utilized in plant-wide networking applications where multiple PLC chassis must communicate over a shared fiber or copper backbone. It is frequently found in high-speed bottling lines, automotive paint booths, and municipal water treatment plants, providing the necessary bandwidth for synchronized motion control and extensive data logging to centralized SQL databases.

Professional FAQ

• Does this module support "Ring" topologies like DLR?

  No, the 1756-ENBT is designed for star or linear topologies. For Device Level Ring (DLR) capabilities, the 1756-EN2TR is the recommended alternative.

• How do I set the IP address for the first time?

  The IP address can be assigned using the Rockwell BOOTP/DHCP utility, or if the module has a rotary switch (on specific hardware revisions), it can be set manually for the 192.168.1.x subnet.