Description

The RELIANCE Y-3023-2-H00AA is a digital I/O processor module designed for use in the Westinghouse Distributed Processing Family(WDPF and WDPF II)distributed control system(DCS),widely deployed in fossil,nuclear,and combined-cycle power plants.As a core component of the WDPF I/O subsystem,the Y-3023-2-H00AA manages high-density digital input and output signals from field devices such as valves,motors,relays,and status indicators.

Manufactured under license or as a direct replacement by RELIANCE Electric,this module ensures seamless integration with legacy Westinghouse control networks,maintaining compatibility with the WDPF’s deterministic data highway and redundant architecture.Engineered for industrial reliability,it supports hot-swapping and redundant configurations to minimize unplanned outages in critical power generation environments.

Application Scenarios

At a 500MW coal-fired power plant in Ohio,operators experienced frequent lockouts in the boiler feedwater pump control circuit due to degraded I/O processor performance.The original Westinghouse Y-3023-2-H00AA modules had exceeded their service life,causing intermittent signal dropouts and false alarms.Maintenance teams replaced the failing units with RELIANCE Y-3023-2-H00AA modules,which are exact form-fit-function replacements.After installation,the digital signal integrity improved significantly,with no false trips recorded over the next 14 months.The RELIANCE Y-3023-2-H00AA’s robust design and clear LED diagnostics allowed technicians to quickly verify module status during routine checks.The upgrade restored confidence in the DCS’s reliability and extended the operational life of the WDPF system by over a decade—proving the critical role of trusted replacement modules in legacy plant maintenance.

Parameter

Main Parameters Value/Description

Product Model RELIANCE Y-3023-2-H00AA

Manufacturer RELIANCE Electric(Authorized Replacement for Westinghouse)

Product Category Digital I/O Processor Module

Compatible System Westinghouse WDPF,WDPF II,WDPF-III DCS

Function Digital Input/Output Processing(Discrete Control)

Signal Type 24VDC Digital Inputs and Outputs

Redundancy Support Yes–Supports redundant pairs with automatic failover

Bus Interface WDPF I/O Bus(Deterministic,proprietary backplane communication)

Installation Method Front-loadable,hot-swappable in WDPF chassis(e.g.,C211,C212)

Power Supply 24VDC and 5VDC from backplane(redundant)

Operating Temperature 0°C to+60°C(standard industrial range)

Environmental Rating Humidity:5–95%non-condensing;Vibration:IEC 60068-2-6 compliant

Diagnostics LED indicators for Power,Run,Fault,and Communication status

Certifications CE,UL Listed(as part of WDPF system),suitable for industrial control environments

Technical Principles and Innovative Values

Innovation Point 1:The RELIANCE Y-3023-2-H00AA maintains full compatibility with the WDPF’s deterministic control bus,ensuring precise timing for safety-critical sequences such as turbine trips,boiler interlocks,and emergency shutdowns.

Innovation Point 2:It supports hardware-level redundancy,allowing primary and backup modules to operate in synchronous mode,minimizing process disruption during controller faults or maintenance.

Innovation Point 3:Designed for hot-swap replacement,the RELIANCE Y-3023-2-H00AA enables field service without shutting down the DCS—critical for continuous operation in power plants.

Innovation Point 4:As a licensed or engineered replacement,the module preserves the original Westinghouse functionality while offering improved availability and long-term support,addressing obsolescence in aging WDPF installations.

Application Cases and Industry Value

A nuclear power facility in South Carolina was preparing for a 20-year license extension but faced challenges sourcing obsolete WDPF components.The balance-of-plant(BOP)system relied on Y-3023-2-H00AA modules for pump and valve control.After rigorous testing,the plant approved the RELIANCE Y-3023-2-H00AA as a qualified replacement.Over 40 modules were installed across redundant racks,with no compatibility issues.The RELIANCE Y-3023-2-H00AA’s consistent performance and clear fault indication reduced mean time to repair(MTTR)by 45%.Regulatory auditors confirmed the module met all safety and documentation requirements.This successful deployment enabled the plant to maintain its legacy DCS infrastructure while meeting modern reliability standards—highlighting the RELIANCE Y-3023-2-H00AA’s vital role in extending the lifecycle of critical control systems.

Related Product Combination Solutions

Westinghouse C211/C212 Chassis:I/O cabinet;houses the RELIANCE Y-3023-2-H00AA and other WDPF I/O modules.

Y-3021-2-H00AA:Analog Input Processor;often used alongside Y-3023-2-H00AA for mixed-signal control.

Y-3024-2-H00AA:Analog Output Module;integrates with RELIANCE Y-3023-2-H00AA in coordinated control loops.

Y-3001-2-H00AA:Central Processing Unit(CPU);communicates with Y-3023-2-H00AA via WDPF data highway.

Y-3011-2-H00AA:Power Supply Module;provides regulated 5V/24VDC to the RELIANCE Y-3023-2-H00AA.

WDPF Console(e.g.,VS-640):Operator interface;monitors status from Y-3023-2-H00AA digital points.

RELIANCE Y-3001-2-H00AA:Replacement CPU;pairs with Y-3023-2-H00AA for full DCS modernization.

WDPF III Migration Kits:Allow integration of RELIANCE Y-3023-2-H00AA into newer control environments.

Installation,Maintenance,and Full-Cycle Support

The RELIANCE Y-3023-2-H00AA installs directly into Westinghouse WDPF I/O chassis(e.g.,C211)by sliding into the backplane slot.It draws power and communicates via the proprietary WDPF bus.No configuration is required—module function is determined by its slot position and associated field terminal boards(e.g.,TB-24VDC).

LED indicators on the front panel provide real-time status:

Green(PWR):Module powered

Green(RUN):Normal operation

Red(FAULT):Hardware or communication error

Yellow(COM):Active data exchange

Routine maintenance includes visual inspection of LEDs and cleaning of backplane connectors during scheduled outages.The module is field-replaceable in under 5 minutes,minimizing downtime.

We offer full lifecycle support for the RELIANCE Y-3023-2-H00AA,including:

Compatibility verification with existing WDPF systems

Firmware and revision tracking

On-site testing and commissioning

Obsolescence management and long-term supply planning

Whether you’re maintaining a legacy coal plant or upgrading a nuclear facility,our team ensures reliable,certified components for your critical control infrastructure.Contact us today for inventory availability and technical support.

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