1. Product Overview
Part No.: 3A98608G03
Manufacturer: Westinghouse (subsequently acquired by Emerson Automation)
Product Type: VME bus SCSI serial communication interface module designed exclusively for WEStation workstation, WDPF and early Ovation DCS host rack, G03 is the mature third upgraded revision of the series. It is a single-slot VME plug-in board responsible for SCSI peripheral data link and auxiliary serial channel communication of DCS host unit, mechanically compatible with standard VME64 Eurocard slot, direct pin-to-pin replacement for former G01/G02 versions without chassis or backplane modification. Original OEM mass production is permanently discontinued; available products include factory-certified refurbished modules and tested surplus original spare units for power plant DCS maintenance retrofit.
2. Electrical & Environmental Specifications
Working input power sourced from VME backplane bus: +5VDC / +12VDC / -12VDC bus power supply, typical total operating power consumption ≤7.2W. Equipped with one internal SCSI controller channel and two independent RS232 serial ports at front panel; SCSI interface complies with SCSI-2 industrial standard, supporting connection of system hard disk, tape storage and peripheral storage devices for DCS historical data backup. All communication ports integrate surge suppression, ESD protection and overvoltage blocking circuit against field interference.
Operating ambient temperature: 0℃ ~ +55℃ inside sealed control cabinet; storage temperature: -40℃ ~ +85℃; relative humidity: 5%~95% non-condensing. The module meets CE EMC industrial electromagnetic compatibility and UL component safety standards for thermal power and petrochemical DCS control cabinet deployment. Front-panel multi-color LED indicators separately display VME bus power status, SCSI link active signal, serial port transmit/receive pulse and internal fault alarm status.
3. Core Functional Features
VME bus master-slave communication function: Realizes high-speed data exchange between WEStation host CPU and external SCSI storage equipment via onboard SCSI protocol processing chip, undertaking DCS configuration file storage, historical trend data archiving and event log saving tasks.
Dual independent RS232 serial channels: Used for local debugging terminal connection, printer data output and third-party auxiliary equipment serial data interaction of DCS workstation.
Built-in hardware fault self-diagnosis circuit: Automatically detects VME bus access error, SCSI bus short/open circuit and serial port abnormal overload; fault codes can be uploaded to host CPU via VME bus for system fault recording and HMI alarm prompt.
Standard single-width VME structure supports hot-swap replacement under partial rack power-off state, avoiding full workstation shutdown during on-site maintenance and minimizing system outage duration. Full PCB conformal three-proof coating improves anti-moisture, dust-proof and anti-corrosion performance under harsh industrial cabinet environment.
4. G03 Version Upgrade Optimization
Optimized SCSI signal filtering circuit to reduce transmission error rate caused by cabinet power frequency interference and variable-frequency equipment electromagnetic noise compared with G01/G02 early revisions.
Upgraded industrial-grade high-temperature durable crystal oscillator and control IC components to enhance long-term continuous running stability under full-load working condition.
Improved serial port ESD protection grade to resist up to ±15kV contact electrostatic impact from field maintenance operation.
Revised PCB wiring layout for better heat dissipation, lowering internal component operating temperature and extending service life.
5. Typical Application Scenarios
Serving as dedicated communication spare part for WEStation host cabinet of coal-fired power plant, cogeneration unit and petrochemical factory equipped with Westinghouse classic WDPF and early-generation Ovation DCS system, mainly deployed on DCS operator station, historical server and engineering workstation rack for storage and serial peripheral expansion.
6. Installation & Maintenance Requirements
All plug/unplug operations must follow strict ESD anti-static grounding specification; disconnect corresponding VME slot power before module replacement. After installation and power-on, verify SCSI storage identification and serial port communication transmission normally before loading DCS operating software. Conduct regular dust removal for PCB surface and front port terminals every six months to guarantee heat dissipation and interface contact reliability. Spare modules shall be stored in constant-temperature dry ESD warehouse; quarterly short-time powered aging test is recommended to prevent component performance degradation caused by long-term idle storage.
7. Market Supply Status
Emerson has stopped original new production of 3A98608G03; current available procurement resources are certified refurbished modules and inspected pre-owned original spare parts with standard after-sales warranty.
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