Westinghouse 7379A62G02 – 8-Channel Analog Input Card for WDPF Control Systems

The Westinghouse 7379A62G02 is an 8-channel analog input (AI) module designed for the WDPF (Westinghouse Distributed Processing Family) distributed control system—a foundational DCS platform deployed globally in nuclear, fossil fuel, and industrial power generation from the late 1970s through the 1990s. This module conditions and digitizes critical process signals such as 4–20 mA current loops, 1–5 V DC, or thermocouple/mV inputs (depending on terminal block configuration), enabling the WDPF to monitor and control variables like pressure, temperature, flow, and level.

As many WDPF systems remain operational under extended plant licenses—particularly in nuclear facilities—the 7379A62G02 continues to serve as a vital spare part for maintaining regulatory compliance, safety, and reliability in mission-critical control loops.

Application Scenarios

At a U.S. pressurized water reactor (PWR), feedwater temperature monitoring relied on a Westinghouse 7379A62G02 module to read signals from RTD sensors via compatible terminal blocks. During a routine surveillance test, one channel exhibited drift beyond calibration tolerance. With the original module long obsolete, the plant sourced a reconditioned 7379A62G02 that had been functionally tested and calibrated to NIST-traceable standards. After installation and loop validation, the system met all Technical Specification requirements—avoiding a potential LER (License Event Report) and ensuring continued safe operation. The incident highlighted the ongoing necessity of high-integrity legacy I/O like the 7379A62G02 in regulated environments.

Parameter

表格

– 4–20 mA (most common)

– 1–5 V DC

– ±10 V DC

– Thermocouple (J, K, etc.) or RTD (with appropriate TB) |

| Resolution | Typically 12-bit or higher |

| Isolation | Channel-to-channel and field-to-system isolation (opto/isolation amplifiers) |

| Accuracy | ±0.1% of span (typical, when paired with proper terminal blocks) |

| Update Rate | ～100 ms per channel (system-dependent) |

| Diagnostics | LED indicators per channel; fault reporting to WDPF DPU |

| Mounting | Plug-in card for WDPF I/O chassis (e.g., 7379-series backplane) |

| Operating Temperature | 0°C to +60°C |

| Status | Obsolete – No longer manufactured; available via surplus or reconditioned sources |

⚠️ Note: Exact signal compatibility depends on the associated terminal block (e.g., 7379Txx series). The 7379A62G02 itself is the processing card; signal conditioning is often shared with the terminal interface.

Technical Principles and Historical Significance

Innovation Point 1: Early Distributed Architecture

The 7379A62G02 was part of one of the first true DCS platforms, moving control logic from centralized panels to distributed nodes—improving reliability and maintainability in large plants.

Innovation Point 2: Modular Signal Flexibility

By pairing the same AI module with different terminal blocks, engineers could adapt the 7379A62G02 to diverse sensor types without changing the core I/O card—reducing spares complexity.

Innovation Point 3: Built for Harsh Environments

Designed with conformal coating, robust connectors, and wide power tolerances, these modules routinely exceed 30+ years of service in electrically noisy turbine halls.

Innovation Point 4: Bridge to Modernization

Many utilities retain 7379A62G02 modules during phased migrations, using protocol gateways (e.g., Modbus TCP converters) to integrate WDPF data into modern historian or Ovation systems.

Related WDPF Components

7379A61G01 / G02: Analog output (AO) modules—complementary to 7379A62G02

7379T62G01 / G02: Terminal blocks for 4–20 mA or voltage inputs (paired with 7379A62G02)

9942A30G13: Digital I/O module—used in same cabinets for discrete signals

1C31117H01 / H02: WDPF DPU (Distributed Processing Unit)—processes data from 7379A62G02

WDPF OIS (Operator Interface Station): Configuration and monitoring workstation

Emerson Ovation: Successor platform—often used in brownfield WDPF replacements

Sourcing, Testing, and Support

Since Westinghouse exited the DCS market (with WDPF assets eventually transitioning through ABB, then Emerson), the 7379A62G02 is no longer produced. However, certified suppliers offer:

New Old Stock (NOS): Original sealed inventory—rare but ideal for critical spares

Fully Reconditioned Units:

Functionally tested on WDPF-compatible rigs

Cleaned, inspected for capacitor leakage or trace corrosion

Calibrated with traceable documentation (optional)

Conformal coating reapplied if needed

As-Removed (Tested): Verified operational with full diagnostics report

We provide 7379A62G02 modules with:

8-channel input simulation test (4–20 mA sweep)

Communication handshake validation with DPU emulator

LED and fault-reporting verification

Compatibility confirmation based on your WDPF revision and terminal block type

All reconditioned units include a 12-month warranty and technical support from engineers with direct WDPF experience.

Final Note

While newer systems offer advanced features, the Westinghouse 7379A62G02 remains a workhorse in plants where reliability, regulatory compliance, and risk mitigation outweigh the push for modernization. Proper management of this legacy component ensures decades-old control strategies continue to protect people, equipment, and the grid.

Contact us for verified 7379A62G02 availability, calibration services, or assistance with your WDPF obsolescence roadmap. When every milliamp counts, trust the interface that’s stood the test of time.