Product Overview

The WESTINGHOUSE 1C31234G01 is a high-reliability digital input module engineered for integration into Westinghouse’s legacy WDPF(Westinghouse Distributed Processing Family)II and III distributed control systems,which have long served as the backbone of automation in nuclear,fossil-fuel,and combined-cycle power plants worldwide.Designed to capture discrete on/off signals from field devices such as limit switches,relay contacts,and auxiliary contacts of breakers or valves,the WESTINGHOUSE 1C31234G01 converts these binary states into logic-level data for processing by the central WDPF controller—enabling real-time monitoring,interlocking,and safety shutdown functions critical to plant integrity.

Built to meet the stringent electromagnetic compatibility(EMC)and environmental resilience requirements of mission-critical energy infrastructure,the WESTINGHOUSE 1C31234G01 features robust isolation circuitry,transient suppression,and optical coupling to protect the control system from ground loops,voltage spikes,and electrical noise prevalent in high-voltage industrial settings.Its compact,card-edge form factor allows seamless insertion into standard WDPF I/O chassis,supporting both simplex and redundant configurations.As a key component in maintaining operational continuity during plant life extension or obsolescence mitigation programs,the WESTINGHOUSE 1C31234G01 delivers proven performance,backward compatibility,and ease of integration—making it indispensable for utilities managing aging but still-functional WDPF installations.

Technical Specifications

Parameter Name Parameter Value

Product Model 1C31234G01

Manufacturer Westinghouse Electric Company

Product Type Digital Input Module(Discrete I/O)

Input Channels 16 isolated channels

Nominal Input Voltage 24 VDC(wetted or dry contact compatible)

Input Threshold ON:≥15 VDC;OFF:≤5 VDC

Isolation Voltage 500 VAC RMS(channel-to-backplane)

Response Time<10 ms per channel

Backplane Interface Proprietary WDPF parallel bus

Operating Temperature 0°C to+60°C

Degree of Protection IP20(for use inside control cabinets)

Mounting Slide-in card for WDPF I/O chassis(e.g.,1C31199G01 backplane)

Main Features and Advantages

Robust signal acquisition for safety-grade applications:The 1C31234G01 employs galvanic isolation on all 16 input channels,preventing fault propagation from field wiring into the sensitive logic of the WDPF controller.Each channel includes built-in LED status indicators visible through the front panel,enabling rapid visual diagnostics during commissioning or troubleshooting—critical in environments where unplanned outages carry significant safety and financial consequences.The module supports both dry contact(passive)and wetted contact(active 24 VDC sourced)inputs,offering flexibility in interfacing with diverse field instrumentation without requiring external relays.

Designed for longevity in demanding power generation environments:Unlike commercial-grade I/O modules,the 1C31234G01 is constructed with industrial-grade components rated for continuous operation under thermal stress,vibration,and high electromagnetic interference—common in turbine halls and switchyards.Its conformal-coated PCB and ruggedized edge connector ensure decades of service life,aligning with the 30–40-year design basis of many nuclear facilities still operating on WDPF platforms.The module requires no configuration jumpers or software setup;once installed in a compatible chassis,it is automatically recognized by the WDPF system database.

Seamless obsolescence management and lifecycle support:As original WDPF hardware ages,the 1C31234G01 remains a vital spare for sustaining plant operations.Many units available today are either NOS(New Old Stock)or professionally refurbished to OEM specifications,ensuring functional equivalence to original production.Its mechanical and electrical compatibility eliminates the need for costly system-wide upgrades,allowing operators to extend the life of their control architecture while maintaining regulatory compliance.For engineering teams managing legacy automation,the 1C31234G01 represents a reliable,drop-in solution that preserves system integrity without introducing integration risk.

Application Field

The 1C31234G01 is predominantly deployed within power generation facilities utilizing Westinghouse’s WDPF control platform,especially in nuclear power plants across North America and Asia where WDPF systems were historically standard.In these environments,the 1C31234G01 interfaces with critical safety-related equipment—such as reactor coolant pump status contacts,containment isolation valve feedback,and emergency diesel generator run signals—feeding essential binary data into the plant’s process control and protection logic.Its reliability ensures that discrete events are captured accurately,forming the foundation for automatic trip sequences or operator alerts during abnormal conditions.

Beyond nuclear applications,the 1C31234G01 also serves in fossil fuel power stations,where it monitors boiler flame scanners,pulverizer status,and fan interlocks in coal-fired units,or gas turbine enclosure door switches and lube oil pressure switches in combined-cycle plants.In industrial cogeneration and district heating facilities retrofitted with WDPF controls,the 1C31234G01 continues to provide dependable digital input handling for auxiliary systems.Even as newer DCS platforms emerge,many utilities opt to maintain WDPF in non-safety portions of the plant due to its stability,making the 1C31234G01 a strategic spare for minimizing downtime during component failures.Its role is not merely functional but foundational—ensuring that the digital“eyes”of the control system remain open,vigilant,and responsive.

Related Products

1C31229G01:Analog input module for WDPF II/III systems(4–20 mA signals)

1C31235G01:Digital output module counterpart to 1C31234G01,used for actuating relays or alarms

1C31199G01:WDPF I/O chassis/backplane that houses 1C31234G01 and other I/O cards

1C31182G01:WDPF processor module that communicates with 1C31234G01 via backplane bus

1C31234G02:Revised version of 1C31234G01 with updated component sourcing or minor firmware tweak

1C31217G01:High-speed pulse counter module for turbine speed monitoring in WDPF systems

1C31204G01:Communication interface module linking WDPF to external networks or HMIs

1C31238G01:Redundant power supply module for WDPF I/O chassis supporting 1C31234G01

1C31176G01:WDPF operator console interface card used in legacy workstation setups

1C31240G01:Thermocouple input module for temperature monitoring in boiler/turbine applications

Installation and Maintenance

Pre-installation preparation:Before installing the 1C31234G01,verify compatibility with the target WDPF I/O chassis(typically models like 1C31199G01)and confirm that the system database includes the correct I/O mapping for the slot.Ensure the chassis power is de-energized and follow lockout/tagout procedures,as improper insertion under power may damage backplane traces.Inspect the card-edge connector for oxidation or debris,and handle the module by its edges to avoid electrostatic discharge(ESD)damage to sensitive CMOS circuitry.Confirm that field wiring adheres to WDPF grounding and shielding practices—particularly for safety-related inputs—to prevent noise-induced false triggers.

Maintenance recommendations:The 1C31234G01 is solid-state and requires no routine calibration,but periodic visual inspection of front-panel LEDs during normal operation can reveal stuck or intermittent channels.If a channel fails to respond,check field wiring continuity and contact resistance before assuming module fault.In high-humidity environments,consider cabinet desiccant or climate control to prevent corrosion on connectors.When replacing a failed 1C31234G01,document the old unit’s serial number and failure mode for root-cause analysis.Refurbished units should be tested under simulated load conditions prior to installation in critical loops.Given the long lifecycle of WDPF systems,maintaining a spares inventory of 1C31234G01 is strongly advised to mitigate supply chain risks associated with legacy hardware.

Product Guarantee

Every 1C31234G01 we provide undergoes rigorous functional testing on authentic WDPF test benches,including channel-by-channel input validation,isolation integrity checks,and backplane communication verification.We guarantee that each unit—whether new surplus or expertly refurbished—meets Westinghouse’s original electrical and mechanical specifications for reliable operation in power plant control systems.All 1C31234G01 modules are backed by a 12-month warranty against manufacturing defects and include full technical documentation upon request.Our engineering team,with decades of WDPF platform experience,offers direct support for integration queries or failure analysis.Because in critical infrastructure,component reliability isn’t optional—it’s non-negotiable—we stand behind every 1C31234G01 with confidence,expertise,and unwavering commitment to your operational continuity.

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