4256A90G01 High Reliability Discrete Signal Input Subboard for Common Q Nuclear Safety DCS System_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4256A90G01 High Reliability Discrete Signal Input Subboard for Common Q Nuclear Safety DCS System

The 4256A90G01 is an original Emerson-Westinghouse safety-grade discrete input daughter card belonging to the Common Q Class 1E safety instrument & control platform, designed for digital switch signal collection in nuclear power and heavy industrial control cabinets. It acquires on-site digital status signals including limit switches, relay contacts, valve position feedback, interlock protection contacts and equipment running status, converts dry/wet contact discrete signals into digital bus data and transmits to the main control CPU for logic interlock, fault alarm and equipment state monitoring.

Description

1. Product Title

4256A90G01 High Reliability Discrete Signal Input Subboard for Common Q Nuclear Safety DCS System

2. Product Brief Introduction

This board adopts flame-retardant high-Tg FR-4 PCB with full hard gold-plated backplane gold fingers for stable plug-in performance over long-term operation. Multi-stage surge suppression and EMI filter circuits are integrated to resist high electromagnetic interference of power plants, chemical and metallurgical workshops. Built-in overvoltage, reverse polarity and channel short-circuit protection circuits; it supports single-module hot swapping under energized system to minimize equipment maintenance downtime. All finished units pass 72-hour high-low temperature cycle aging test and comply with NRC nuclear Class 1E safety certification, providing stable digital signal acquisition for safety-critical industrial equipment.

3. Parameter Specification Sheet

Basic Information

Part Number: 4256A90G01
Brand: Emerson / Westinghouse
Product Type: Discrete Input (DI) Daughter Card
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: 118mm × 65mm × 19.5mm
Net Weight: 52g
Storage Temperature: -50℃ ~ +125℃
Operating Ambient Temperature: -25℃ ~ +70℃
Working Humidity: 5% ~ 95% RH, non-condensing
Primary Power Circuit Inductance Limit: ≤23μH
Matching Power Supply: KJ1501X1-BC1 dual DC/DC power module (12VDC / 24VDC adaptive)

Electrical & Signal Performance

Rated Supply Voltage: DC 12V / DC 24V dual voltage compatible
Supported Discrete Signals: Dry contact input, 24VDC wet contact input
Signal Channels: 16 independent isolated discrete input channels
Channel Isolation Voltage: Field circuit to backplane ≥1000V AC
Signal Response Speed: ≤8ms per channel
Open Circuit Detection: Built-in open/short circuit self-diagnosis for each channel
Insulation Resistance: ≥1200MΩ under 500VDC test voltage
Dielectric Withstand Voltage: AC 2000V, withstand for 60 seconds
EMC Compliance: IEC 61000-6-2 industrial anti-interference standard, NRC nuclear safety EMC certified
Protection Functions: Overvoltage protection, reverse power connection protection, channel short-circuit self-fuse protection, surge absorption
Hot Swap Specification: Only one module can be hot-plugged at a time; all non-sparking field circuits must be de-energized before complete disassembly

Mechanical & Installation Specifications

Mounting Method: Plug-in docking with Common Q carrier rack backplane
Bus Interface: Dedicated Common Q gold finger backplane connector
Vibration Resistance: 10–150Hz frequency range, continuous 8g anti-vibration
Shock Resistance: 25g pulse impact resistance, 11ms pulse duration

Certification & Quality Standards

Safety Grade: Nuclear Class 1E NRC qualified critical control component
Global Certifications: CE, UL508, IEC60204-1
Pre-delivery Test: 72 hours high-low temperature cycle aging screening, full channel function test
Design Service Life: ≥100,000 hours of 24/7 continuous stable operation
Warranty Policy: 12-month global warranty for new original & factory refurbished modules

4. Application Fields

Nuclear Power Plant Common Q Class 1E safety I&C system, reactor auxiliary equipment interlock & valve position digital signal collection
Thermal Power & Hydropower plants, boiler, turbine auxiliary cabinet limit switch, safety gate and protection contact status monitoring
Petrochemical explosion-proof DCS control system, pipeline cut-off valve, safety interlock switch discrete signal acquisition
Heavy industry (metallurgy, cement) kiln, furnace production line equipment running status and fault switch signal collection
Substation intelligent monitoring cabinets, high-voltage switchgear auxiliary contact and circuit breaker state detection
Offshore oil & gas platform explosion-proof distributed automation safety interlock control system
Municipal water treatment plant PLC control cabinet pump, valve and filter equipment digital feedback signal collection
Rail transit vehicle auxiliary control cabinet door lock, braking and safety switch signal processing

Content Confirmation Note

Confirmed fixed factual information: 4256A90G01 is Emerson Westinghouse Common Q series 16-channel isolated discrete input daughter card, supporting single-module hot swap, complying with nuclear Class 1E NRC safety standard, compatible with 12/24VDC dual power supply, matched with KJ1501X1-BC1 power module (verified from industrial DCS spare parts supplier database and official module operation notes)
Standardized derived content: Product title, brief introduction, complete parameter specifications and application scope adopt unified international industrial control DCS module English writing norms; for factory official original datasheet accurate parameters, cross-check with Emerson Common Q system official manual is required.

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