3A99190G01 Remote I/O Interface Board｜English Specification_Ningde Androld Automation Equipment Co.,Ltd.

June 05, 2026

3A99190G01 Remote I/O Interface Board｜English Specification

3A99190G01 is a dedicated remote I/O interface module of Emerson Ovation DCS system, developed from legacy Westinghouse control hardware, used as communication gateway between central controller main rack and field distributed remote I/O racks. It converts Ovation backplane Multibus protocol into proprietary remote field bus signal, realizes bidirectional real-time data exchange between CPU and dispersed analog/digital I/O modules, widely deployed on thermal power, nuclear power plant DCS boiler, turbine, auxiliary equipment control cabinet to shorten field wiring length and expand system layout range. Standard single-width plug-in structure, fully compatible with universal Ovation system rack, supports hot swap and redundant dual-card configuration for critical remote control loops.

Description

1. Product Overview

It converts Ovation backplane Multibus protocol into proprietary remote field bus signal, realizes bidirectional real-time data exchange between CPU and dispersed analog/digital I/O modules, widely deployed on thermal power, nuclear power plant DCS boiler, turbine, auxiliary equipment control cabinet to shorten field wiring length and expand system layout range.

Standard single-width plug-in structure, fully compatible with universal Ovation system rack, supports hot swap and redundant dual-card configuration for critical remote control loops.

2. Core Electrical Parameters

Backplane power supply: +5VDC from rack backplane bus, typical power consumption ≤2W
Communication interface: Front panel dedicated field bus terminal port (proprietary differential bus, RS485 physical layer based), single bus can link multiple remote I/O sub-racks
Bus transmission rate: Fixed Ovation remote bus baud rate for real-time I/O data sync; built-in bus short-circuit isolation & transient surge suppression circuit
Onboard diagnosis circuit: Hardware fault self-check, bus communication error detection, power abnormal lockout protection
Signal isolation: Galvanic isolation between backplane internal circuit and field remote bus to avoid site interference surge backfeed damage main controller

3. Environmental & Mechanical Specification

Operating temperature: 0℃ ~ +60℃ inside control cabinet; storage: -40℃ ~ +85℃
Humidity: 5%~95%RH non-condensing, full PCB three-layer conformal coating (moisture-proof, anti-mold, anti-salt spray) for power plant harsh cabinet environment
EMC standard: Comply with IEC61000 industrial electromagnetic compatibility standard
Dimension: Standard Ovation single slot board size, unified installation dimension same as 3A99166/3A99168 series I/O cards

4. Front Panel Indicator & Installation Feature

LED indicators: POWER (green, board power status), BUS COMM (yellow, remote bus normal communication), FAULT (red, hardware/bus failure alarm)
Front edge dedicated bus terminal connector for field remote cable wiring, no extra adapter needed
Hot-swap design: Replaceable online without main rack power cut; important remote control loops adopt dual redundant 3A99190G01 to prevent single card failure causing remote I/O offline

5. Application & Troubleshooting

Main Application

Connect scattered remote I/O racks of boiler feed pump, fan, valve actuators, turbine auxiliary system to central DCS controller, collect field DI/DO/AI/AO signals centrally.

Common Fault Check

All remote rack offline: Red FAULT light steady on → backplane power failure or front bus cable open/short circuit
Partial remote subrack lost communication: Loose field bus wiring or terminal oxidation
Power LED off: Rack backplane +5V power supply abnormal or onboard power circuit damaged

6. Spare Part Info

OEM original serial production discontinued; available supply: new surplus original stock & fully bench-tested refurbished modules with standard 12-month warranty.

Contact Info