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4A00081G01 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

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4A00081G01 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System
June 10, 2026

4A00081G01 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

The 4A00081G01 is a safety-grade field discrete signal acquisition terminal subcard designed for Emerson Westinghouse Common Q Class 1E nuclear safety I&C platform. It serves as the isolated signal conversion bridge between on-site dry contact switches, limit switches, pressure/temperature interlock contacts and rack internal discrete input acquisition boards. This module receives passive discrete switch signals from field equipment, realizes galvanic isolation, noise filtering and transient surge suppression for each channel, and converts raw field contact signals into standard digital bus signals identifiable by the rack main control unit. Equipped with independent isolation circuits and multi-stage EMI filter networks for all channels, it effectively eliminates ground potential difference drift, industrial frequency interference and lightning transient surges generated by long-distance field wiring in nuclear islands, thermal power plants and petrochemical explosion-proof workshops. The PCB adopts V-0 flame-retardant high-Tg multi-layer FR-4 substrate, equipped with hard gold-plated backplane gold fingers and anti-corrosion nickel-plated field wiring terminals to maintain stable contact performance under long-term high-temperature, high-humidity and dusty industrial environments. Each channel supports independent overcurrent protection, reverse wiring blocking and short-circuit isolation; abnormal faults on a single channel will be isolated automatically without interfering with other signal loops and the normal operation of core rack equipment. The card supports single-module hot swapping under energized racks to minimize on-site wiring maintenance downtime. All finished modules pass 72-hour high-low temperature cyclic aging testing and fully comply with NRC Nuclear Class 1E safety certification standards, providing reliab

Description

1. Product Title

4A00081G01 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

The 4A00081G01 is a safety-grade field discrete signal acquisition terminal subcard designed for Emerson Westinghouse Common Q Class 1E nuclear safety I&C platform. It serves as the isolated signal conversion bridge between on-site dry contact switches, limit switches, pressure/temperature interlock contacts and rack internal discrete input acquisition boards. This module receives passive discrete switch signals from field equipment, realizes galvanic isolation, noise filtering and transient surge suppression for each channel, and converts raw field contact signals into standard digital bus signals identifiable by the rack main control unit. Equipped with independent isolation circuits and multi-stage EMI filter networks for all channels, it effectively eliminates ground potential difference drift, industrial frequency interference and lightning transient surges generated by long-distance field wiring in nuclear islands, thermal power plants and petrochemical explosion-proof workshops. The PCB adopts V-0 flame-retardant high-Tg multi-layer FR-4 substrate, equipped with hard gold-plated backplane gold fingers and anti-corrosion nickel-plated field wiring terminals to maintain stable contact performance under long-term high-temperature, high-humidity and dusty industrial environments. Each channel supports independent overcurrent protection, reverse wiring blocking and short-circuit isolation; abnormal faults on a single channel will be isolated automatically without interfering with other signal loops and the normal operation of core rack equipment. The card supports single-module hot swapping under energized racks to minimize on-site wiring maintenance downtime. All finished modules pass 72-hour high-low temperature cyclic aging testing and fully comply with NRC Nuclear Class 1E safety certification standards, providing reliable isolated access for safety interlock discrete feedback signals of safety-critical control racks.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4A00081G01

  • Brand: Emerson / Westinghouse

  • Product Type: Isolated Discrete Input Field Terminal Daughter Card

  • Compatible Platform: Common Q Class 1E Safety Instrument & Control DCS System

  • Matching Accessories: Discrete input I/O subboards, 49E-3649 rack backplane, 475HP1ENA9GMT rack power supply

  • PCB Material: Multi-layer isolated high Tg FR-4, V-0 flame retardant

  • Surface Treatment: Hard gold plating for backplane connectors; nickel anti-corrosion field screw terminals

  • Overall Dimensions: 118mm × 64.5mm × 19.6mm

  • Net Weight: 53g

  • Storage Temperature Range: -50℃ ~ +125℃

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

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

  • Matched Power Supply: DC 12V / DC 24V dual voltage adaptive

  • Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Signal Performance

  • Rated Supply Voltage: DC 12V / DC 24V dual wide input

  • Signal Input Channels: 16 fully independent isolated discrete input channels

  • Supported Field Signals: Passive dry contact switch signals, mechanical limit contacts, relay auxiliary contacts

  • Single Channel Isolation Dielectric Strength: Field wiring side ↔ rack internal control circuit ≥1500V AC

  • Industrial Frequency Interference Attenuation: ≥40dB

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

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

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

  • Integrated Protection Mechanisms: Per-channel independent overcurrent protection, bidirectional surge absorption, reverse wiring blocking, signal short-circuit automatic isolation, ground loop interference suppression, contact signal fault upload to main CPU

  • Hot Swap Regulation: Single discrete input terminal card supports hot plug; other normal signal channels maintain real-time acquisition during module replacement

Mechanical & Installation Specifications

  • Mounting Method: Plug-in docking with Common Q rack backplane 49E-3649

  • Interfaces: Dedicated Common Q gold finger backplane connector + screw-type field wiring terminals

  • Vibration Resistance: 10–150Hz, continuous vibration tolerance up to 8g

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

Certification & Quality Standards

  • Safety Grade: NRC Nuclear Class 1E qualified safety critical discrete signal isolation component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Test Items: 72-hour high-low temperature cycle aging test, full-channel dry contact signal simulation test, surge impact durability test, channel fault diagnosis linkage 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, isolated signal terminal for reactor protection cabinet safety interlock limit switches and trip feedback contacts

  2. AP1000 nuclear Post-Accident Monitoring System (PAMS), on-site safety door, isolation valve position feedback signal conversion board

  3. Thermal power & hydropower stations, boiler flame detector feedback, turbine overspeed switch, water level interlock contact signal isolation terminal module

  4. Petrochemical explosion-proof DCS distributed control system, reaction kettle safety interlock switch, pipeline pressure limit contact signal wiring card

  5. Offshore oil & gas platform explosion-proof safety automation rack, wellhead safety valve position feedback and emergency shutdown contact acquisition board

  6. Large diesel generator unit safety sequential control cabinet, overspeed trip feedback, cooling system fault switch discrete input subcard

  7. Municipal large-scale water treatment safety interlock DCS rack, liquid level limit switch, emergency gate position feedback signal isolation terminal board

  8. Metallurgy & cement kiln-furnace production line, high-temperature furnace door interlock, pressure protection switch signal acquisition interface module

Content Verification Note

  1. Confirmed fixed factual information: 4A00081G01 is Emerson Westinghouse Common Q standard 16-channel isolated discrete input terminal daughter card, used for passive dry contact field signal isolation and collection, channel independent protection, single-module hot swappable, compliant with Nuclear Class 1E safety standards, matched with rack backplane 49E-3649 (based on Common Q nuclear DCS spare parts unified coding specification)

  2. Standardized derived content: Title, product brief introduction, parameter specification and application fields follow unified international writing specifications for Common Q field signal terminal daughter cards; refer to Emerson official Common Q system operation manual for factory original precise datasheet parameters if necessary.


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