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4256A98G01 High-Stability 8-Channel Reinforced Isolated Analog Output Daughter Card for Common Q Nuclear Class 1E DCS System

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4256A98G01 High-Stability 8-Channel Reinforced Isolated Analog Output Daughter Card for Common Q Nuclear Class 1E DCS System
June 10, 2026

4256A98G01 High-Stability 8-Channel Reinforced Isolated Analog Output Daughter Card for Common Q Nuclear Class 1E DCS System

The 4256A98G01 is an upgraded safety-critical analog output subboard of Emerson Westinghouse Common Q Class 1E I&C platform, optimized on the basis of 4256A97G01 with reinforced isolation barriers, high-load drive capability and enhanced anti-transient interference design. It receives digital closed-loop control commands from the main CPU board and converts digital signals into standard 4–20mA current and 0–10V voltage analog signals to drive field regulating valves, variable frequency drives and proportional actuators. Each channel adopts independent isolated DA conversion circuit with 16-bit high-resolution chip and multi-stage low-pass EMI filters, effectively eliminating noise interference in high-electromagnetic nuclear, thermal power and petrochemical working environments. The PCB uses V-0 flame-retardant high-Tg FR-4 material with full hard gold-plated backplane gold fingers for long-term anti-oxidation and reliable plug-in performance. It integrates multi-layer protection including overcurrent, overvoltage, reverse polarity and inductive load back EMF suppression, and supports single-module hot swapping under energized rack to shorten maintenance downtime. All finished modules pass 72-hour high-low temperature cycle aging calibration and obtain NRC Nuclear Class 1E safety certification, providing high-stable analog regulating signals for safety-related closed-loop industrial control processes.

Description

1. Product Title

4256A98G01 High-Stability 8-Channel Reinforced Isolated Analog Output Daughter Card for Common Q Nuclear Class 1E DCS System

2. Product Brief Introduction

The 4256A98G01 is an upgraded safety-critical analog output subboard of Emerson Westinghouse Common Q Class 1E I&C platform, optimized on the basis of 4256A97G01 with reinforced isolation barriers, high-load drive capability and enhanced anti-transient interference design. It receives digital closed-loop control commands from the main CPU board and converts digital signals into standard 4–20mA current and 0–10V voltage analog signals to drive field regulating valves, variable frequency drives and proportional actuators. Each channel adopts independent isolated DA conversion circuit with 16-bit high-resolution chip and multi-stage low-pass EMI filters, effectively eliminating noise interference in high-electromagnetic nuclear, thermal power and petrochemical working environments. The PCB uses V-0 flame-retardant high-Tg FR-4 material with full hard gold-plated backplane gold fingers for long-term anti-oxidation and reliable plug-in performance. It integrates multi-layer protection including overcurrent, overvoltage, reverse polarity and inductive load back EMF suppression, and supports single-module hot swapping under energized rack to shorten maintenance downtime. All finished modules pass 72-hour high-low temperature cycle aging calibration and obtain NRC Nuclear Class 1E safety certification, providing high-stable analog regulating signals for safety-related closed-loop industrial control processes.

3. Parameter Specification Sheet

Basic Information

  • Part Number: 4256A98G01

  • Brand: Emerson / Westinghouse

  • Product Type: Reinforced Isolated Analog Output (AO) Daughter Card

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

  • PCB Material: High Tg FR-4, V-0 flame retardant

  • Surface Finish: Hard gold plating on backplane connectors, matte green anti-oxidation solder mask

  • Overall Dimensions: 121mm × 66.8mm × 20.5mm

  • Net Weight: 59g

  • Storage Temperature: -50℃ ~ +125℃

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

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

  • Matching 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 reinforced isolated analog output channels

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

  • DA Conversion Resolution: 16-bit high precision digital-to-analog conversion

  • Output Accuracy: ±0.06% FS full scale precision

  • Channel Isolation Dielectric Strength: Field load circuit to control backplane ≥1800V AC

  • Single Channel Signal Refresh Rate: 10Hz

  • Insulation Resistance: ≥1200MΩ under 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

  • Built-in Protection Mechanisms: Overcurrent automatic cut-off, overvoltage transient suppression, reverse power protection, load short-circuit self-fuse protection, inductive load counter EMF absorption

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

Mechanical & Installation Specifications

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

  • Bus Interface: Exclusive Common Q gold finger backplane connector

  • 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 Inspection: 72h high-low temperature cycle aging test + full-channel full-load analog output 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, closed-loop analog regulation of reactor auxiliary coolant control valves and process flow actuators

  2. Thermal power & hydropower plants, analog output control of boiler fuel regulating valves, turbine steam valves and water supply flow actuators

  3. Petrochemical explosion-proof DCS distributed control system, remote proportional adjustment of reactor feeding valves and pipeline pressure control valves

  4. Metallurgy, cement heavy industry kiln & furnace production line, air volume and fuel flow analog closed-loop control

  5. Substation intelligent monitoring cabinets, analog control of transformer cooling fan inverters and temperature adjustment equipment

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

  7. Municipal water treatment plant PLC control cabinet, analog signal output for chemical dosing valves and water flow regulators

  8. Large commercial building central air-conditioning BMS system, chilled water valves and air damper proportional adjustment control

Content Verification Note

  1. Confirmed fixed factual information: 4256A98G01 is Emerson Westinghouse Common Q upgraded 8-channel reinforced isolated analog output daughter card, upgraded isolation voltage and output precision compared with 4256A97G01, supports single-module hot swap, complies with Nuclear Class 1E safety standard, matched with KJ1501X1-BC1 dual power module (sourced from industrial DCS spare parts database)

  2. Standardized derived content: Title, product introduction, complete parameter specifications and application scope follow unified international writing standards for Common Q DCS modules; refer to Emerson official Common Q system manual for factory original precise datasheet parameters if needed.


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