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

Description

The Allen-Bradley 1756-ENBT is a chassis-based industrial communication module engineered for the ControlLogix hardware architecture. It functions as a dedicated bridge link between localized automation infrastructure and macro-level plant networks, handling explicit messaging and real-time distributed data transfers over EtherNet/IP links. Incorporating 1 standard copper RJ45 socket that handles 10/100 Mbps communication rates over Category 5 network infrastructure, the 1756-ENBT supports 64 TCP/IP connections alongside up to 128 simultaneous CIP connections to execute multi-node monitoring and distributed standard remote IO interfaces.

Employing a standardized open-style enclosure rated to occupy a single slot width inside any standard hardware rack, this communication module uses producer-consumer networking mechanisms to facilitate seamless data distribution across multiple distributed system controllers. Field personnel can perform diagnostic assessments directly via the onboard front digital indicator panel. The circuit framework provides up to 30V continuous operational isolation between the physical network cabling and the backplane logic components to insulate internal automation architectures against transient external electrical surges.

Features

• Bridges Control Network Architectures: Provides a specialized communication interface linking upstream factory networking layers with standard remote I/O sub-assemblies.
• Dual Connection Topologies: Features dual capability with support for a maximum of 64 TCP/IP connections alongside 128 physical CIP connection configurations.
• Integrated Hardware Diagnostics: Front-mounted localized digital indicators simplify system verification by reporting live hardware states and communication errors.
• Industrial Media Support: Built with a standard 10/100 Mbps copper RJ45 port compatible with shielded or unshielded category 5 twisted-pair media lines.

Applications

• Remote I/O station integration and localized distributed control rack telemetry.
• Standardized supervisory control and real-time plant data management links.
• Inter-chassis processor logic sharing and machine-to-machine data synchronization.
• Variable frequency drive monitoring and integrated remote peripheral instrumentation data paths.

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Module Insertion: Align the circuit board edge with the top and bottom channel guides of a free rack slot inside the target chassis. Push firmly inward until the securing mechanism locks completely.
• Network Media Routing: Secure the 802.3 compliant Category 5 Ethernet cable to the front RJ45 port. Implement appropriate cable management bends to avoid mechanical tension on the port assembly.
• Electrical Mitigation and Separation: Keep network lines segregated from motor supply leads and high-power AC conductors within the industrial cabinet to mitigate localized electromagnetic induction.
• Enclosure Cleanliness: Since the unit utilizes an open-style open-style chassis configuration, maintain ambient surrounding temperatures below 60 Celsius and guard against conductive foreign debris.

Compliance and Certifications

• ATEX
• China CCC
• Australian RCM
• American Bureau of Shipping
• Semiconductor Inds Immunit

Official Product Documentation

Access and download the official Allen-Bradley manufacturer publications for this module: