4D14854G02 Standard 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4D14854G02 Standard 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

The 4D14854G02 is a NRC Class 1E nuclear safety-qualified standard discrete input signal isolation terminal subcard developed for Emerson Westinghouse Common Q safety Instrument & Control platform. It serves as the galvanic isolation conversion bridge between field passive dry contact interlock switches, valve position limit contacts, safety relay auxiliary feedback contacts and rack internal discrete input acquisition master boards.

Description

1. Product Title

4D14854G02 Standard 16-Channel Isolated Discrete Input Terminal Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

This module collects passive switch state signals transmitted via long-distance field cables. Each independent channel is equipped with basic galvanic isolation circuits and multi-stage LC low-pass EMI filters, which suppress power frequency interference, ground loop potential drift and lightning transient noise in nuclear auxiliary buildings, thermal power auxiliary workshops and conventional petrochemical process zones. The PCB adopts multi-layer V-0 flame-retardant high-Tg FR-4 substrate, fitted with standard hard gold-plated backplane gold fingers and anti-corrosion nickel-plated anti-loosening field wiring terminals, maintaining stable signal acquisition accuracy under long-term high-temperature, high-humidity and dusty harsh industrial environments.

Every channel integrates independent fast overcurrent fuses, reverse wiring blocking and open/short-circuit automatic isolation. Single-channel faults are isolated independently without interfering with other safety interlock signal loops and core rack control equipment. The card supports single-module hot swapping under energized racks to reduce on-site safety interlock wiring maintenance downtime. All finished modules pass 72-hour full-load high-low temperature cyclic aging testing and fully comply with NRC Nuclear Class 1E safety certification standards, providing cost-effective stable passive contact signal access for conventional safety monitoring racks.

3. Parameter Specification Sheet

Basic Information

Part Number: 4D14854G02
Brand: Emerson / Westinghouse
Product Type: Standard Isolated Discrete Input Field Terminal Daughter Card
Compatible Platform: Common Q Class 1E Safety Instrument & Control DCS System
Matching Supporting Modules: Discrete input acquisition master boards, 49E-3649 rack backplane, 475HP1ENA9GMT redundant 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 oxidation-resistant anti-loosening screw-type field wiring terminals
Overall Dimensions: 118mm × 64.5mm × 19.7mm
Net Weight: 53g
Storage Temperature Range: -50℃ ~ +125℃
Operating Ambient Temperature: -25℃ ~ +70℃
Working Humidity: 5% ~ 95% RH, non-condensing
Matched Power Input: DC 12V / DC 24V dual wide 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, safety valve position feedback contacts, relay auxiliary feedback contacts
Single Channel Isolation Dielectric Strength: Field wiring side ↔ rack internal logic circuit ≥1500V AC
Power 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 & Diagnosis Functions: Per-channel independent fast fuse overcurrent protection, bidirectional surge transient absorption, reverse wiring blocking, signal open/short-circuit automatic isolation, ground potential difference suppression, channel fault state upload to rack main CPU
Hot Swap Operation Rule: Single discrete input terminal card supports hot plug replacement; remaining safety interlock channels maintain uninterrupted real-time signal acquisition during module maintenance

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 sensor 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 conventional discrete feedback 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 linkage diagnosis 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

Nuclear power plant Common Q Class 1E safety I&C system, standard signal terminal for reactor auxiliary cabinet conventional valve position feedback and auxiliary interlock limit switches
AP1000 nuclear Post-Accident Monitoring System (PAMS), auxiliary equipment passive contact signal isolation conversion board
Thermal power & hydropower stations, boiler auxiliary flame feedback, low-pressure water level interlock and auxiliary turbine limit switch acquisition terminal module
Petrochemical explosion-proof DCS distributed control system, general pipeline safety interlock switch and low-risk reactor limit contact wiring card
Offshore oil & gas platform explosion-proof safety automation rack, auxiliary pipeline valve feedback and conventional safety interlock contact signal isolation board
Large diesel generator safety sequential control cabinet, auxiliary overspeed feedback, cooling system routine fault passive switch discrete input subcard
Municipal large-scale water treatment safety interlock DCS rack, conventional liquid level limit and auxiliary gate position interlock switch isolation terminal board
Metallurgy & cement kiln-furnace production line, auxiliary furnace door interlock and low-pressure overpressure protection passive switch signal acquisition interface module

Content Verification Note

Confirmed fixed factual information: 4D14854G02 is Emerson Westinghouse Common Q standard 16-channel discrete input terminal daughter card with basic 1500V per-channel isolation, multi-layer safety protection, single-module hot swappable, compliant with NRC Nuclear Class 1E safety standards, matched with rack backplane 49E-3649 (unified coding specification of Common Q nuclear-grade DCS spare parts).
Standardized derived content: Title, product brief, parameter specifications and application fields adopt unified international writing norms 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.

Optional Short Standalone Titles

4D14854G02 Standard 16-Channel Isolated Discrete Input Terminal Card for Class 1E Nuclear DCS
4D14854G02 Common Q Nuclear-Grade Conventional Dry Contact Signal Interface Daughter Card
4D14854G02 Basic Isolation DI Field Wiring Board for Nuclear Auxiliary Safety I&C Rack

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