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4A00081H01 High-Isolation 16-Channel Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS System

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4A00081H01 High-Isolation 16-Channel Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS System
June 10, 2026

4A00081H01 High-Isolation 16-Channel Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS System

The 4A00081H01 is an upgraded high-reliability discrete input terminal subcard of Emerson Westinghouse Common Q Class 1E nuclear safety I&C platform, iteratively optimized based on baseline model 4A00081G01 with reinforced galvanic isolation, enhanced high-energy surge suppression and built-in full-channel real-time fault self-diagnosis. It acts as a safety isolation conversion interface between field passive dry contact switches, valve position limit contacts, safety interlock relays and rack internal discrete input acquisition boards. The module collects passive switch state signals from long-distance field wiring, performs independent filtering, surge clamping and ground loop elimination for each channel, and converts raw contact signals into standardized digital bus signals readable by the main CPU. Adopting multi-stage LC low-pass filter circuits and high-withstand isolation transformers, it resists severe electromagnetic interference, lightning transients and potential drift in nuclear islands, thermal power boiler houses and petrochemical explosion-proof areas. Its PCB is multi-layer V-0 flame-retardant high-Tg FR-4 with thickened hard gold-plated backplane gold fingers and anti-corrosion nickel-gold field screw terminals, maintaining stable contact under continuous high temperature, high humidity and dusty harsh environments. Every channel is equipped with independent fast overcurrent protection, reverse wiring blocking and short-circuit automatic cut-off; fault information of each channel can be uploaded to the rack diagnostic board without interfering with other signal loops. The card supports single-module hot swapping under energized racks to cut field wiring maintenance downtime. All finished units pass 72-hour full-load high-low temperature cyclic aging calibration and fully satisfy NRC Nuclear Class 1E safety certification, delivering higher anti-interference and diagnostic performance for safety interlock discrete feedback signal access of nuclear-grade control racks.

Description

1. Product Title

4A00081H01 High-Isolation 16-Channel Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear Safety DCS System

2. Product Brief Introduction

The 4A00081H01 is an upgraded high-reliability discrete input terminal subcard of Emerson Westinghouse Common Q Class 1E nuclear safety I&C platform, iteratively optimized based on baseline model 4A00081G01 with reinforced galvanic isolation, enhanced high-energy surge suppression and built-in full-channel real-time fault self-diagnosis. It acts as a safety isolation conversion interface between field passive dry contact switches, valve position limit contacts, safety interlock relays and rack internal discrete input acquisition boards. The module collects passive switch state signals from long-distance field wiring, performs independent filtering, surge clamping and ground loop elimination for each channel, and converts raw contact signals into standardized digital bus signals readable by the main CPU. Adopting multi-stage LC low-pass filter circuits and high-withstand isolation transformers, it resists severe electromagnetic interference, lightning transients and potential drift in nuclear islands, thermal power boiler houses and petrochemical explosion-proof areas. Its PCB is multi-layer V-0 flame-retardant high-Tg FR-4 with thickened hard gold-plated backplane gold fingers and anti-corrosion nickel-gold field screw terminals, maintaining stable contact under continuous high temperature, high humidity and dusty harsh environments. Every channel is equipped with independent fast overcurrent protection, reverse wiring blocking and short-circuit automatic cut-off; fault information of each channel can be uploaded to the rack diagnostic board without interfering with other signal loops. The card supports single-module hot swapping under energized racks to cut field wiring maintenance downtime. All finished units pass 72-hour full-load high-low temperature cyclic aging calibration and fully satisfy NRC Nuclear Class 1E safety certification, delivering higher anti-interference and diagnostic performance for safety interlock discrete feedback signal access of nuclear-grade control racks.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4A00081H01

  • Brand: Emerson / Westinghouse

  • Product Type: High-Isolation Discrete Input Field Terminal Daughter Card

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

  • Matching Modules: All discrete input acquisition subboards, 49E-3649 rack backplane, 475HP1ENA9GMT redundant rack power supply

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

  • Surface Treatment: Thick hard gold plating for backplane connectors; nickel-gold anti-oxidation field wiring terminals

  • Overall Dimensions: 119mm × 65mm × 20mm

  • Net Weight: 55g

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

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

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

  • Rated Power Input: DC 12V / DC 24V dual voltage adaptive

  • Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Signal Performance

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

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

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

  • Single Channel Isolation Dielectric Strength: Field wiring side ↔ rack internal logic circuit ≥1800V AC (upgraded from G01’s 1500V AC)

  • Power Frequency Interference Attenuation: ≥45dB

  • 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 & Diagnosis Functions: Per-channel independent overcurrent fuse protection, bidirectional surge transient absorption, reverse wiring blocking, signal short-circuit automatic isolation, ground potential difference suppression, real-time channel fault detection and timestamped fault code upload

  • Hot Swap Instruction: Single discrete input terminal card supports hot plug operation; remaining signal channels keep uninterrupted real-time signal acquisition during module replacement

Mechanical & Installation Specifications

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

  • Interfaces: Dedicated exclusive gold finger backplane connector + anti-loosening screw-type field wiring terminals

  • Vibration Resistance: 10–150Hz frequency range, 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, lightning surge durability test, channel fault diagnosis linkage test

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

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

4. Application Fields

  1. Nuclear power plant Common Q Class 1E safety I&C system, high-isolation signal terminal for reactor protection cabinet safety interlock limit switches and trip feedback contacts

  2. AP1000 nuclear Post-Accident Monitoring System (PAMS), safety door interlock, isolation valve position feedback signal conversion and diagnostic interface board

  3. Thermal power & hydropower stations, boiler flame detection feedback, turbine overspeed switch, water level interlock contact high-stability signal terminal module

  4. Petrochemical explosion-proof DCS distributed control system, reactor safety interlock switch, pipeline pressure limit contact anti-surge wiring card

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

  6. Large diesel generator 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 high-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 definite information: 4A00081H01 is the upgraded high-isolation version of 4A00081G01 under Emerson Common Q nuclear DCS series, featuring higher channel isolation voltage, stronger surge protection and built-in channel fault self-diagnosis, supporting single-module hot swap, compliant with NRC Nuclear Class 1E safety standards, compatible with rack backplane 49E-3649 (based on Common Q nuclear-grade spare parts unified coding rules)

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


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