1756-EN27 | Allen Bradley | ControlLogix EtherNet/IP Fiber Optic Communication Module

Product Overview

The Allen Bradley 1756-EN27 functions as a high-performance communication bridge within the ControlLogix platform, specifically designed for fiber-optic EtherNet/IP connectivity. It facilitates high-speed data exchange between controllers, I/O devices, and HMI systems over long distances while maintaining complete electrical isolation. We supply this unit as 100% Brand New and original factory sealed, guaranteeing the highest signal integrity for your mission-critical network backbone.

Technical Specifications

The 1756-EN27 utilizes specialized fiber optics to bypass the limitations of standard copper cabling:

Engineering Advantages

• Total Electromagnetic Immunity: By utilizing a fiber optic physical layer, the 1756-EN27 eliminates risks associated with Electromagnetic Interference (EMI) and Radio Frequency Interference (RFI). This solves the persistent industrial pain point of data corruption in environments with high-voltage VFDs or heavy welding equipment.

• Extended Distance Connectivity: Unlike standard copper Ethernet restricted to 100 meters, this fiber module supports significantly longer cable runs. This capability allows engineers to connect remote control rooms and distributed I/O racks without signal degradation or the need for intermediate repeaters.

• Elimination of Ground Loops: The non-conductive nature of fiber optic cabling prevents ground loop currents between different plant sections. This protects sensitive ControlLogix backplanes and improves overall system safety during lightning strikes or power surges.

• Real-Time Diagnostics: The integrated digital display provides immediate feedback on IP addresses and module status. This feature accelerates the commissioning phase and reduces downtime by allowing technicians to troubleshoot network errors directly at the rack without a laptop.

FAQs

Q: What type of fiber optic cable does the 1756-EN27 require?

A: This module requires Multi-Mode Fiber (MMF) cabling. It features an LC-style connector for secure, low-loss termination.

Q: Can I install the 1756-EN27 into a remote I/O chassis?

A: Yes. The 1756-EN27 functions as both a local communication module and a remote adapter. It allows a central ControlLogix CPU to control I/O across a fiber optic network link.

Q: Does the 1756-EN27 support 1 Gbps speeds?

A: No. The 1756-EN27 operates at a fixed 100 Mbps rate. This speed provides a stable, deterministic environment optimized for industrial EtherNet/IP traffic rather than high-bandwidth commercial data.

Q: Is this module compatible with standard ControlLogix 1756 chassis?

A: Yes. The module features a standard slot-width design and draws its power directly from the 1756 backplane. It integrates seamlessly with any standard ControlLogix power supply and chassis configuration.