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4256A97G01 High Precision 8-Channel Isolated Analog Output Daughter Card for Common Q Class 1E Nuclear DCS System

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4256A97G01 High Precision 8-Channel Isolated Analog Output Daughter Card for Common Q Class 1E Nuclear DCS System
June 10, 2026

4256A97G01 High Precision 8-Channel Isolated Analog Output Daughter Card for Common Q Class 1E Nuclear DCS System

The 4256A97G01 is an original Emerson Westinghouse safety-grade analog output subboard designed for the Common Q Nuclear Class 1E safety instrument & control platform. It receives digital regulation instructions transmitted by the main control CPU, converts digital control signals into standard industrial analog current/voltage signals, and outputs analog control values to field actuators including control valves, frequency converters and electric regulators. Each channel adopts independent reinforced isolation circuit and high-resolution DA conversion chip, equipped with multi-stage EMI filtering and surge suppression components to resist strong electromagnetic interference in nuclear power, thermal power and petrochemical sites. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated backplane gold fingers to ensure long-term stable plugging performance. It integrates comprehensive protection functions such as overvoltage, overcurrent, reverse connection and load short-circuit self-cutoff, and supports single-module hot swapping under energized rack to reduce maintenance downtime. All finished modules pass 72-hour high-low temperature cycle aging test and comply with NRC Nuclear Class 1E safety certification, providing stable analog regulation output for safety-critical industrial closed-loop control processes.

Description

1. Product Title

4256A97G01 High Precision 8-Channel Isolated Analog Output Daughter Card for Common Q Class 1E Nuclear DCS System

2. Product Brief Introduction

The 4256A97G01 is an original Emerson Westinghouse safety-grade analog output subboard designed for the Common Q Nuclear Class 1E safety instrument & control platform. It receives digital regulation instructions transmitted by the main control CPU, converts digital control signals into standard industrial analog current/voltage signals, and outputs analog control values to field actuators including control valves, frequency converters and electric regulators. Each channel adopts independent reinforced isolation circuit and high-resolution DA conversion chip, equipped with multi-stage EMI filtering and surge suppression components to resist strong electromagnetic interference in nuclear power, thermal power and petrochemical sites. The PCB adopts V-0 flame-retardant high-Tg FR-4 substrate with full hard gold-plated backplane gold fingers to ensure long-term stable plugging performance. It integrates comprehensive protection functions such as overvoltage, overcurrent, reverse connection and load short-circuit self-cutoff, and supports single-module hot swapping under energized rack to reduce maintenance downtime. All finished modules pass 72-hour high-low temperature cycle aging test and comply with NRC Nuclear Class 1E safety certification, providing stable analog regulation output for safety-critical industrial closed-loop control processes.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4256A97G01

  • Brand: Emerson / Westinghouse

  • Product Type: Isolated Analog Output (AO) 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: 120mm × 66mm × 20.2mm

  • Net Weight: 57g

  • Storage Temperature: -50℃ ~ +125℃

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

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

  • Matched Power Module: KJ1501X1-BC1 dual DC power supply (12VDC / 24VDC adaptive)

  • Primary Power Circuit Inductance Limit: ≤23μH

Electrical & Signal Performance

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

  • Output Channels: 8 fully independent isolated analog output channels

  • Standard Output Signals: 4–20mA DC current, 0–10V DC voltage

  • DA Conversion Resolution: 16-bit high precision

  • Output Accuracy: ±0.08% FS full scale precision

  • Channel Isolation Strength: Field load circuit to control backplane ≥1500V AC

  • Signal Refresh Frequency: 10Hz per channel

  • 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 Functions: Overvoltage suppression, overcurrent automatic cutoff, reverse power protection, load short-circuit self-fuse protection, inductive load counter EMF absorption

  • Hot Swap Operation Rule: Only one module can be hot-plugged at a time; all field actuator load circuits must be fully de-energized before complete disassembly

Mechanical & Installation Specifications

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

  • Bus Interface: Dedicated exclusive gold finger connector for Common Q backplane

  • 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 control component

  • Global Certifications: CE, UL508, IEC60204-1

  • Pre-delivery Test: 72-hour high-low temperature cycle aging test + full-channel analog output load simulation calibration 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, analog regulation output of reactor auxiliary control valves and coolant flow adjustment equipment

  2. Thermal power & hydropower plants, closed-loop control output of boiler fuel valves, turbine regulating valves and water supply actuators

  3. Petrochemical explosion-proof DCS distributed control system, remote analog regulation of reaction kettle feeding valves, pipeline flow control valves

  4. Heavy industry (metallurgy, cement) kiln & furnace production line, air volume, fuel flow analog adjustment output

  5. Substation intelligent monitoring cabinets, analog control of cooling fan frequency converters and transformer cooling regulating equipment

  6. Offshore oil & gas platform explosion-proof automation safety control system, pipeline pressure and liquid level closed-loop regulation

  7. Municipal water treatment plant PLC control cabinet, analog output control of dosing valves and water flow regulating actuators

  8. Large building central air-conditioning BMS system, chilled water valve, air damper analog adjustment control

Content Verification Note

  1. Confirmed fixed factual information: 4256A97G01 is Emerson Westinghouse Common Q series 8-channel isolated analog output daughter card, supporting 4–20mA / 0–10V standard analog signals, single-module hot swappable, meets Nuclear Class 1E safety standard, matched with KJ1501X1-BC1 dual power module (data sourced from industrial DCS spare parts supplier database)

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


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