A-B-1756-EN2T ControlLogix EtherNet/IP Communication Module

Description

Comprehensive Technical Parameters

‑ Slot requirement: Single‑slot installation, fits any vacant slot on 1756‑series chassis, incompatible with CompactLogix racks ‑ Network interface: 1×RJ45 10/100Mbps auto‑negotiation port; 1×USB port for local parameter setting and firmware upgrade ‑ Protocol support: EtherNet/IP, CIP, TCP/IP; maximum 128 TCP connections resourceRockwell A… ‑ IP configuration methods: Top rotary switch, BOOTP‑DHCP server, or configuration software RSLinx / Studio 5000ManualsLib ‑ Backplane load: 1A @5.1VDC, power consumption approx 6.2WRockwell A… ‑ Status display: Digital code display plus LNK, NET, OK LED indicator lights ‑ Compatible software: Studio 5000 / RSLogix5000 V18 and above, RSLinx Classic, ControlFLASH for firmware updateRockwell A… ‑ Environmental condition: 0‑60℃ cabinet‑mount installation, non‑condensing; basic insulation between Ethernet side and backplane circuitRockwell A… ‑ Note: Single‑port hardware, does not support DLR ring network function, select 1756‑EN2TR if ring topology is required

Practical Application Features

Real‑time EtherNet/IP I/O connection realizes data interaction with remote distributed I/O racks, reducing long‑distance field wiring workload. CIP message function supports data exchange with other PLC, HMI, barcode readers and third‑party EtherNet/IP field devices. USB port facilitates on‑site fast IP assignment and firmware refresh without relying on factory network environment. Replace the old‑type 1756‑ENBT module as mainstream upgrade spare‑part for old ControlLogix systems. Built‑in simple web page for quick viewing of module running status and network fault information.

Field Installation & Commissioning Guidance

Power off the chassis before plug‑in, insert the module into any empty slot and lock the latch securely. Set IP address via rotary switch or BOOTP tool; restore factory defaults by setting rotary switch to 888 and power‑cycling the rackManualsLib. Import correct module profile inside Studio 5000 hardware configuration, match firmware revision with project requirements. Adopt CAT5e or higher‑grade shielded Ethernet cable for industrial cabinet; separate network wiring from high‑power cables to avoid EMI interference. Plan CIP connection quantity reasonably; avoid exhausting 128 TCP connection resources caused by excessive HMI and I/O devices. Complete network communication test, verify remote I/O and HMI data reading‑writing function before formal production operation.

In‑Site Troubleshooting Reference

1. OK indicator off: Module abnormal; check chassis backplane power supply, seating status, or firmware version mismatch.
2. LNK light unlit: Ethernet cable damage, wrong crystal‑crimping standard, or remote switch port failure.
3. NET indicator abnormal: Invalid IP address, subnet conflict, or network broadcast storm on site.
4. Intermittent EtherNet/IP I/O timeout: Too short RPI request interval, over‑limit connection quantity, unmanaged switch causing multicast jam.
5. Cannot connect via USB: Bad USB cable, driver missing, module hardware fault.
6. Communication drops occasionally: Poor cabinet ground, heavy electromagnetic interference; optimize shielding and network switch configuration.