Product Overview

The Honeywell 8937-HN is a specialized Fiber Optic Extender Module engineered for the Series 8 I/O architecture within Distributed Control Systems (DCS). This module serves a dual purpose: it facilitates high-speed signal extension over fiber optic media while managing high-precision analog output tasks. By utilizing fiber optics, the 8937-HN enables long-distance I/O communication that is entirely immune to electromagnetic interference (EMI) and radio frequency interference (RFI). It is specifically designed for high-performance automation environments where maintaining signal integrity over distance and ensuring rapid update rates for actuators and control elements are critical operational requirements.

Hardware Parameters

The 8937-HN combines advanced conversion electronics with ruggedized optical interfacing to meet stringent industrial standards.

• Module Function: Fiber Optic Extender / Analog Output Interface

• I/O Capacity: 8 High-Speed Channels

• Resolution: 16-bit Digital-to-Analog conversion

• Precision: ±0.1% Full Scale

• Output Ranges: 0-10 V, ±10 V, 0-20 mA, and 4-20 mA

• Update Frequency: Up to 10 kHz per channel

• Common Mode Rejection: >100 dB at 50/60 Hz

• Network Support: Fault Tolerant Ethernet (FTE) and IO-Link protocols

• Power Requirement: 24 VDC

• Operating Temperature: -20°C to +60°C

• Environmental Resistance: IEC 60068-2 compliant (Shock and Vibration)

• Dimensions: 125 mm x 100 mm x 75 mm

Industrial Applications

The 8937-HN is an essential component for distributed architectures where field devices are located far from the central control room or in areas with high electrical noise.

• Remote I/O Extension: Linking Series 8 I/O racks across large plant floor distances without the risk of ground loops.

• Turbine Control: Providing ultra-fast analog signals for valve positioning and governor control in power generation.

• Refinery Operations: Managing signal distribution in areas with high-density cabling where copper-based interference is a concern.

• Hazardous Area Isolation: Using fiber optics to provide total galvanic isolation between different plant segments for increased safety.