Allen‑Bradley 1756‑ENBT EtherNet/IP Communication Bridge Module

The Allen‑Bradley 1756‑ENBT is an EtherNet/IP bridge communication module for Rockwell ControlLogix PLC systems. It offers one 10/100Mbps RJ45 twisted‑pair port, enabling real‑time I/O control, message communication and HMI data exchange between ControlLogix controllers and EtherNet/IP field devices.

This rack‑mount plug‑in module supports up to 64 TCP/IP connections and SNMP network management function. It is end‑of‑life original hardware, widely stocked as spare parts for retrofitting and maintenance of existing automation cabinets in manufacturing, water‑treatment and petrochemical sites.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation); Model: 1756‑ENBT; Type: EtherNet/IP Bridge Module
• Applicable System: ControlLogix PLC automation platform
• Core Tasks: EtherNet/IP real‑time I/O communication, controller interconnection, HMI data access, network diagnostic
• Signal Interface: Single RJ45 10/100Mbps Ethernet port, ControlLogix backplane connector
• Installation: Plug‑in slot‑mount on standard ControlLogix chassis rack
• Supported Protocols: EtherNet/IP, SNMP, TCP/IP, maximum 64 TCP connections
• Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing, industrial anti‑vibration grade
• Mechanical: Standard ControlLogix module form‑factor, IP20 cabinet‑mount installation
• Certifications: CE, compliant with Rockwell industrial automation EMC requirements

Core Functions

• Act as EtherNet/IP communication gateway for ControlLogix controller, realizing real‑time I/O interaction with drives, remote adapters and other EtherNet/IP nodes.
• Support controller‑to‑controller message communication and HMI data access for supervisory monitoring and production data acquisition.
• Built‑in network status LED indicators and SNMP function for link monitoring, IP conflict detection and on‑site fault troubleshooting.
• Transmit data between Ethernet network and ControlLogix backplane bus to complete high‑speed data forwarding for the whole rack.
• Compact rack‑plug‑in design for quick installation and replacement inside ControlLogix automation cabinets.
• Industrial‑hardened circuit board ensures stable continuous operation for long‑term existing production‑site retrofitting projects.

Application Scenarios

• Spare‑part replacement for legacy ControlLogix automation cabinets in manufacturing, water‑treatment and petrochemical industrial sites.
• EtherNet/IP network interface hardware for connecting ControlLogix CPU with remote I/O adapters, variable‑frequency drives and operator stations.
• Maintenance backup inventory for renovation and after‑sales maintenance projects of end‑of‑life Rockwell ControlLogix automation equipment.
• Matching communication module cooperating with ControlLogix CPU, power supply unit and rack chassis assemblies.
• Retrofit replacement for aged Ethernet modules with network dropout, link instability and port‑damage faults.

• Global aftermarket spare supply for automation maintenance teams maintaining Rockwell legacy industrial‑control equipment worldwide.