Westinghouse 7381A93G05 PCB Circuit Board

Technical Dossier

Product Details And Specifications

Westinghouse 7381A93G05 Series: Comprehensive Module Range and Technical Overview

The Westinghouse 7381A93G05 PCB circuit board is a control-grade printed circuit assembly deployed across heavy industrial sectors including petrochemical refineries, nuclear power generation facilities, and continuous-process chemical plants. Westinghouse Electric's industrial automation division produced this board as part of its WDPF (Westinghouse Distributed Processing Family) and OVATION DCS platform ecosystem — systems that remain installed in hundreds of baseload power generation and process control facilities worldwide. The 7381A series boards serve as functional logic, signal conditioning, and I/O interface layers within these distributed control architectures. Their long operational lifespan — often exceeding 20 years in service — means demand for spare and replacement units persists well beyond the original production window.

The Evolution of 7381A Series Architecture

The 7381A board family was developed during Westinghouse Electric's transition from relay-logic and analog panel instrumentation to fully digital distributed control in the late 1970s through the 1990s. Early revisions of the 7381A series were designed for the WDPF platform, which used a proprietary data highway (Westnet II) operating at 1 Mbit/s. These boards handled analog input conditioning, discrete I/O interfacing, and controller-to-field wiring termination within WDPF cabinets.

As the platform matured into the OVATION system (developed jointly after the CBS/Westinghouse merger and subsequent Emerson acquisition), the 7381A board variants were adapted for backward compatibility within hybrid WDPF/OVATION migration projects. Boards in this family use ISA-bus and proprietary backplane connectors, making direct substitution with modern equivalents non-trivial. Facilities running WDPF or early OVATION systems must source original-specification boards to maintain system integrity. The 7381A93G05 specifically represents a fifth-generation revision (G05) of the 93-series sub-family within the 7381A range, indicating incremental hardware corrections or component substitutions from earlier G01–G04 revisions.

7381A Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Westinghouse 7381A and closely related WDPF/OVATION PCB board families. Each entry reflects a distinct functional role within the control system architecture:

7381A93G01: Revision 1 PCB assembly, WDPF analog signal conditioning board, early production variant.
7381A93G02: Revision 2 PCB, component-level corrections to G01, same functional footprint.
7381A93G03: Revision 3 PCB, updated passive component specification for thermal stability.
7381A93G04: Revision 4 PCB, modified trace routing for EMI compliance improvement.
7381A93G05: Revision 5 PCB, current reference revision; signal conditioning and logic interface board.
7379A16G01: WDPF discrete input module, 24 VDC field input, 16-channel DI board.
7379A16G02: Revision 2 discrete input board, updated optoisolator specification.
7380A12G01: Analog output module, 4–20 mA, 12-channel AO interface board.
7380A12G02: Revision 2 AO board, revised DAC component for improved linearity.
7382A08G01: WDPF controller CPU board, 8-bit processing core, primary logic execution.
7382A08G02: Revision 2 CPU board, EPROM update for firmware revision compatibility.
7383A04G01: Communication adapter board, Westnet II data highway interface, 4-port.
7383A04G02: Revision 2 comm adapter, updated transceiver components for signal integrity.
7384A02G01: Power supply regulation board, 24 VDC/5 VDC dual-rail output, backplane power.
7385A01G01: Termination assembly board, field wiring marshalling, passive terminal block interface.
7386A06G01: Redundancy switchover board, bumpless transfer logic for redundant controller pairs.
7387A10G01: Analog input module, 4–20 mA, 10-channel AI conditioning board.
7387A10G02: Revision 2 AI board, updated instrumentation amplifier for common-mode rejection.
7388A03G01: Pulse input / frequency counter board, 3-channel, turbine speed measurement.
7389A01G01: Watchdog and system health monitor board, fault detection and alarm relay output.

Sourcing Hard-to-Find & Obsolete 7381A Series Parts

The Westinghouse WDPF platform reached end-of-life support under Emerson Process Management, and the 7381A board series is no longer manufactured. Original equipment manufacturers do not provide new-build replacements. Facilities requiring the 7381A93G05 or related boards must source from the secondary market — refurbished, tested surplus, or decommissioned plant inventory.

DriveKNMS maintains a dedicated inventory program for WDPF and early OVATION PCB assemblies. Our sourcing network covers decommissioned power plant and refinery control room equipment globally. For the 7381A series specifically, we provide: verified-original boards with traceable decommission documentation; functional test reports prior to shipment; revision-matched units (G01 through G05) to ensure backplane and firmware compatibility; and long-lead procurement support for facilities operating under planned maintenance windows. We do not substitute non-original boards or cross-reference incompatible part numbers into this series.

Quality Control for the 7381A Series Range

PCB assemblies in the 7381A family present specific test challenges due to their proprietary backplane bus architecture and mixed analog/digital signal paths. DriveKNMS applies the following test protocol to all 7381A series boards prior to dispatch:

Visual and physical inspection: Component-level examination for corrosion, cracked solder joints, damaged traces, and capacitor degradation — common failure modes in boards with 15–25 years of service life.
Powered functional test: Each board is energized on a WDPF-compatible test bench. Supply rail voltages (5 VDC, 24 VDC) are verified within ±2% tolerance.
Signal path verification: Analog input and output channels are exercised across the full 4–20 mA range. Linearity error and offset are measured and recorded.
Bus communication test: Boards with Westnet II interface logic are tested for correct data highway framing and acknowledgment behavior.
Thermal soak: Boards are operated at elevated ambient temperature (50°C) for a minimum of 4 hours to screen latent component failures.
Final documentation: Each unit ships with a test record including measured parameters, technician ID, and test date.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.