Westinghouse 7379A21 Modules: 7379A21G02 Specs, Models & Availability

Technical Dossier

Product Details And Specifications

Westinghouse 7379A21 Series: Comprehensive Module Range and Technical Overview

The Westinghouse 7379A21 series represents a core family of electronics modules deployed within the Westinghouse Distributed Processing Family (WDPF) and its successor, the Emerson Ovation DCS platform. These modules have accumulated decades of installed base across heavy industrial sectors including coal-fired and nuclear power generation, petroleum refining, chemical processing, and large-scale utility operations. The 7379A21 family handles analog and digital signal conditioning, process I/O interfacing, and controller-level computation tasks within redundant, high-availability control architectures. Their continued presence in operating plants — many with 20–40 year design lifespans — makes sourcing and lifecycle support a critical operational requirement for maintenance engineers worldwide.

The Evolution of 7379A21 Architecture

The 7379A21 module family originated within the Westinghouse WDPF (Westinghouse Distributed Processing Family) platform, introduced in the late 1970s and widely deployed through the 1980s and 1990s. WDPF used a proprietary data highway (WEStation bus) for inter-module communication, with the 7379A21 series serving as the primary analog electronics interface layer. When Westinghouse's power generation division was acquired by CBS and subsequently by Emerson Electric, the platform evolved into the Ovation DCS. Ovation retained backward compatibility with many WDPF module form factors, allowing 7379A21-series hardware to coexist in hybrid WDPF/Ovation installations. By the 2000s, Emerson introduced the Ovation 3.x architecture with updated I/O modules (5X00xxx series), but the 7379A21 family remained in active service at sites that had not completed full platform migration. As of 2026, the 7379A21 series is classified as mature/end-of-life by Emerson, with no new production. All procurement is sourced from surplus inventory, refurbished stock, or long-term maintenance agreements. Compatibility issues arise primarily at the backplane connector level when mixing early WDPF and later Ovation chassis generations.

7379A21 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified part numbers within the Westinghouse WDPF / Ovation electronics module ecosystem. Each entry reflects a distinct functional role within the control system architecture.

7379A21G01: Analog input electronics module, 4–20 mA signal conditioning, WDPF backplane compatible.
7379A21G02: Analog input electronics module, variant G02 with revised gain-stage configuration for thermocouple/RTD inputs.
7379A21G03: Analog input module, G03 revision with enhanced EMI filtering for high-noise plant environments.
7379A21G04: Analog output electronics module, 4–20 mA drive capability, WDPF bus interface.
7379A21G05: Analog output module, G05 revision with expanded output range and improved linearity specification.
7379A21G06: Analog I/O combination module, dual-channel input/output on single PCB assembly.
7379A21G07: Digital input electronics module, 24 VDC discrete signal acquisition, WDPF data highway interface.
7379A21G08: Digital output electronics module, relay-driven discrete output, 24 VDC/120 VAC compatible.
7379A22G01: Pulse input electronics module, frequency/count signal acquisition for turbine speed and flow measurement.
7379A22G02: Pulse input module, G02 revision with extended frequency range up to 10 kHz.
7381A31G01: Controller processor module, WDPF drop controller, coordinates I/O scanning and data highway communication.
7381A31G02: Controller processor module, G02 revision with expanded memory and faster scan cycle.
5X00058G01: Ovation analog input module, 16-channel, 4–20 mA, successor platform compatible with WDPF hybrid installations.
5X00106G09: Ovation digital output module, 16-channel relay output, used in WDPF-to-Ovation migration projects.
1C31234G01: Ovation I/O module, analog input, 4–20 mA, 8-channel, direct WDPF chassis slot replacement.
1C31227G01: Ovation analog output module, 8-channel, 4–20 mA, used as 7379A21G04 functional replacement.
1C31233G01: Ovation digital input module, 32-channel, 24 VDC, compatible with WDPF field wiring terminations.
5X00119G01: Ovation power supply module, 24 VDC regulated output, supports WDPF/Ovation hybrid chassis configurations.

Sourcing Hard-to-Find & Obsolete 7379A21 Parts

DriveKNMS maintains a dedicated inventory program for end-of-life Westinghouse WDPF and Ovation modules, including the full 7379A21 series. Because Emerson has discontinued new production of these part numbers, procurement channels are limited to: (1) surplus stock from decommissioned power plants and refinery control room upgrades; (2) refurbished units that have been disassembled, cleaned, and component-level tested; and (3) cross-reference substitution using verified Ovation-generation equivalents where backplane and signal compatibility has been confirmed. DriveKNMS sources 7379A21G01 through G08 variants from a global network of industrial surplus suppliers and maintains traceability documentation for each unit. For customers operating WDPF systems under long-term maintenance agreements, DriveKNMS offers consignment stock arrangements and priority allocation for critical spare parts. Lead times for rare variants such as 7379A21G06 and 7379A22G02 are quoted individually based on current inventory status.

Quality Control for the 7379A21 Range

The 7379A21 series uses a multi-layer PCB assembly with a proprietary WDPF backplane edge connector. Quality control procedures at DriveKNMS are adapted to the specific failure modes of this module family. Each unit undergoes: (1) visual inspection of PCB traces, capacitor condition, and connector pin integrity; (2) powered bench test using a WDPF-compatible test chassis to verify data highway communication handshake; (3) analog channel calibration verification against NIST-traceable reference standards for all I/O variants; (4) digital I/O functional test using simulated 24 VDC discrete signals; (5) thermal cycling to identify latent component failures common in aged electrolytic capacitors. Modules that fail calibration tolerance are either recapped and retested or quarantined. All units shipped by DriveKNMS include a test report with measured channel accuracy data and a 12-month warranty against functional failure under normal operating conditions.