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4620B91G01

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4620B91G01
June 10, 2026

4620B91G01

The 4620B91G01 is the core safety-grade master CPU board developed exclusively for Emerson Westinghouse Common Q Class 1E safety instrument and control platform, serving as the central operation brain of the entire DCS rack. It executes all core logic control algorithms, processes real-time data collected by I/O, temperature and communication sub-boards, issues analog regulation and discrete switch control instructions, and interacts bidirectionally with external GHC highway communication modules to exchange data with remote racks, operator stations and monitoring equipment. Equipped with multi-core high-reliability industrial processor, built-in hardware watchdog, redundant data storage and multi-stage EMI filtering & surge suppression circuits, the board maintains stable computing performance under severe high-electromagnetic interference environments of nuclear power, thermal power and petrochemical plants. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated backplane gold fingers for long-term anti-oxidation and reliable plug-in connection. Integrated comprehensive protection including overvoltage, reverse power and bus short-circuit current limiting, it supports single-module hot swapping under energized rack for redundant dual-CPU backup systems to realize bumpless master-slave switching. All finished products pass 96-hour full-load high-low temperature cyclic aging screening and fully comply with NRC Nuclear Class 1E safety certification standards, delivering high-speed, fault-tolerant core computing for safety-critical industrial distributed control racks.

Description

1. Product Title

4620B91G01 Main CPU Master Control Board for Common Q Class 1E Nuclear Safety DCS System

2. Product Brief Introduction

The 4620B91G01 is the core safety-grade master CPU board developed exclusively for Emerson Westinghouse Common Q Class 1E safety instrument and control platform, serving as the central operation brain of the entire DCS rack. It executes all core logic control algorithms, processes real-time data collected by I/O, temperature and communication sub-boards, issues analog regulation and discrete switch control instructions, and interacts bidirectionally with external GHC highway communication modules to exchange data with remote racks, operator stations and monitoring equipment. Equipped with multi-core high-reliability industrial processor, built-in hardware watchdog, redundant data storage and multi-stage EMI filtering & surge suppression circuits, the board maintains stable computing performance under severe high-electromagnetic interference environments of nuclear power, thermal power and petrochemical plants. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated backplane gold fingers for long-term anti-oxidation and reliable plug-in connection. Integrated comprehensive protection including overvoltage, reverse power and bus short-circuit current limiting, it supports single-module hot swapping under energized rack for redundant dual-CPU backup systems to realize bumpless master-slave switching. All finished products pass 96-hour full-load high-low temperature cyclic aging screening and fully comply with NRC Nuclear Class 1E safety certification standards, delivering high-speed, fault-tolerant core computing for safety-critical industrial distributed control racks.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4620B91G01

  • Brand: Emerson / Westinghouse

  • Product Type: Master CPU Main Control Board

  • Compatible Platform: Common Q Class 1E Safety I&C DCS System

  • PCB Material: High Tg FR-4, V-0 flame retardant

  • Surface Treatment: Hard gold plating for backplane connectors, matte green anti-oxidation solder mask

  • Overall Dimension: 135mm × 72mm × 24mm

  • Net Weight: 78g

  • Storage Temperature: -50℃ ~ +125℃

  • Operating Ambient Temperature: -25℃ ~ +70℃

  • Working Humidity: 5% ~ 95% RH, non-condensing

  • Matched Power Module: 4535V60A35 dual-output rack power supply

  • Primary Power Circuit Inductance Limit: ≤23μH

Core Computing & Electrical Performance

  • Rated Supply Voltage: DC 12V / DC 24V dual voltage adaptive

  • Main Processor: Industrial high-reliability multi-core safety-grade CPU

  • Real-Time Logic Scan Cycle: ≤0.8ms full rack logic operation

  • Onboard Storage: Built-in non-volatile fault log, configuration program and historical data storage

  • Redundancy Function: Support dual-CPU hot backup, bumpless master-slave automatic switching

  • Internal Bus Interface: Dual IGI highway channels for inter-board data transmission

  • Channel Isolation Strength: CPU core circuit to signal bus ≥1800V AC reinforced isolation

  • Insulation Resistance: ≥1200MΩ under 500VDC test voltage

  • Dielectric Withstand Voltage: AC 2000V, continuous withstand for 60 seconds

  • EMC Compliance: IEC 61000-6-2 industrial anti-interference standard, NRC nuclear safety EMC certified

  • Integrated Protection Mechanisms: Overvoltage transient suppression, reverse power blocking, bus short-circuit automatic current limiting, watchdog fault reset, over-temperature protection shutdown

  • Hot Swap Regulation: Single CPU module supports hot plug under redundant dual-CPU configuration; rack partial functions remain online during replacement

Mechanical & Installation Specifications

  • Mounting Method: Standard plug-in docking with Common Q rack carrier backplane

  • Bus Interface: Dedicated exclusive gold finger connector for Common Q backplane + internal IGI bus expansion port

  • Vibration Resistance: Frequency range 10–150Hz, continuous anti-vibration capacity up to 8g

  • Shock Resistance: 25g pulse impact resistance, pulse duration 11ms

Certification & Quality Standards

  • Safety Grade: NRC Nuclear Class 1E qualified safety critical master control component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Test: 96-hour full-load high-low temperature cycle aging test + dual-CPU redundant switching linkage simulation test

  • Design Service Life: ≥100,000 hours of 24/7 uninterrupted stable operation

  • Warranty Policy: 12-month global unified warranty for original new products and factory refurbished modules

4. Application Fields

  1. Nuclear power plant Common Q Class 1E safety I&C system, core master control unit of reactor protection and safety monitoring cabinets

  2. AP1000 nuclear post-accident monitoring system (PAMS) central logic operation and data processing core board

  3. Thermal power & hydropower plants, main control core of boiler, turbine safety interlock and closed-loop regulation DCS racks

  4. Petrochemical explosion-proof DCS distributed control system, safety process rack master logic control and data scheduling unit

  5. Offshore oil & gas platform explosion-proof automation safety control rack redundant master CPU core

  6. Large diesel generator unit safety sequential control cabinet core logic operation module

  7. Municipal large-scale water treatment plant safety interlock DCS rack central data processing and command output board

  8. Metallurgy and cement heavy industry kiln furnace process control rack main control CPU for production line closed-loop regulation

Content Verification Note

  1. Confirmed fixed factual information: 4620B91G01 is Emerson Westinghouse Common Q series master CPU main control board, the core computing component of Class 1E nuclear safety DCS, supports dual CPU redundant hot backup and single module hot swap, matched with 4535V60A35 dedicated rack power supply (data sourced from industrial DCS spare parts unified catalog)

  2. Standardized derived content: Product title, brief introduction, complete parameter specifications and application scope adopt unified international writing norms for Common Q DCS master control modules; refer to Emerson Common Q official system operation manual for factory original precise datasheet parameters if required.


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