Allen‑Bradley 1756‑EN2T ControlLogix EtherNet/IP Communication Module

1756‑EN2T is a standard EtherNet/IP communication adapter for Rockwell ControlLogix 1756 series PLC racks, acting as the industrial Ethernet gateway for Logix controllers. It delivers 10/100Mbps twisted-pair network transmission, supporting tag-based producer/consumer communication, program upload/download, and data exchange with HMI, SCADA, remote I/O and multi-system PLCs via EtherNet/IP protocol.

This single RJ45 copper port module carries up to 128 TCP connections and 256 Logix communication paths, equipped with rotary IP address switches and front LED status indicators. It supports hot-swap rack installation, CIP security and SNMP network management, widely used as replacement spare for production line PLC network fault maintenance and automation system expansion projects.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation)
• Model: 1756‑EN2T, Series D, ControlLogix rack communication card
• Network Port: Single RJ45 copper, auto‑negotiate 10/100 Mbps EtherNet/IP
• Connection Capacity: Max 128 TCP sockets, 256 Logix tag communication links
• Backplane Power Draw: 1.0A @5VDC, 3mA @24VDC, single chassis slot width
• Configuration Tools: RSLogix 5000 / Studio 5000, rotary switch quick IP setup
• Core Features: Hot‑swap support, electronic keying, CIP security, SNMP monitoring
• Operating Temperature: 0℃ ~ +60℃, CE/UL industrial certification
• Diagnosis: Front panel LINK, NET, OK LED indicators for real-time network status
• Application: Spare part replacement for factory PLC industrial Ethernet communication hardware

Core Functions

• Realize high-speed tag producer/consumer communication between ControlLogix CPU and field EtherNet/IP devices
• Support PLC program upload/download, online monitoring and tag data access for programming workstations
• Build interconnection between multiple ControlLogix PLC stations, HMI touch screens and upper SCADA/MES systems
• Enable remote EtherNet/IP distributed I/O racks to extend digital and analog signal acquisition range
• CIP security and electronic keying prevent unauthorized device access and mismatched module configuration faults
• Hot‑swap design allows online card replacement without shutting down the entire control rack
• Front rotary switch enables fast IP address assignment without software pre-configuration on site

Application Scenarios

• Automotive assembly, packaging machinery and logistics conveyor ControlLogix PLC network cabinet layout
• Water treatment, HVAC and petrochemical batch process multi-station EtherNet/IP communication construction
• On-site faulty Ethernet module replacement and daily network maintenance of ControlLogix automation systems
• Old production line renovation to add high-speed industrial Ethernet interconnection capability
• Rockwell ControlLogix series communication spare parts inventory backup for manufacturing factories
• Process industry distributed I/O and upper monitoring system network hardware maintenance projects