Description

The WESTINGHOUSE 1C31169G02 is a high-reliability digital input (DI) module engineered for the OVATION™ Distributed Control System (DCS), originally developed by Westinghouse and now maintained under Emerson’s automation portfolio. Designed for mission-critical applications in power generation, oil & gas, and heavy process industries, the WESTINGHOUSE 1C31169G02 provides robust, isolated acquisition of up to 32 discrete field signals—such as breaker status, valve position, or equipment run feedback—at 24 VDC logic levels. Its architecture ensures electrical isolation between field wiring and the internal system bus, protecting the controller from ground loops, surges, and noise common in electrically noisy plant environments.

As part of the OVATION I/O family, the WESTINGHOUSE 1C31169G02 integrates seamlessly into redundant I/O chassis, supporting hot-swap capability and online diagnostics that minimize unplanned outages. The module features LED indicators for real-time channel status monitoring and communicates with the OVATION controller via a high-speed, deterministic backplane protocol. Its ruggedized design meets stringent industry standards for electromagnetic compatibility (EMC) and environmental resilience, making it a staple in nuclear safety-related systems and fossil fuel boiler controls where signal integrity and long-term availability are non-negotiable. Decades after its initial release, the WESTINGHOUSE 1C31169G02 remains in active service worldwide due to its proven reliability and Emerson’s commitment to long-life support for legacy DCS hardware.

WESTINGHOUSE 1C31169G02

Technical Specifications

Main Features and Advantages

High Channel Density with Group Isolation:
The WESTINGHOUSE 1C31169G02 delivers 32 digital inputs in a single-width I/O slot, maximizing panel space efficiency in large-scale control cabinets. Inputs are organized into four isolated groups of eight channels each, allowing flexible grounding strategies and reducing cross-channel interference—critical when interfacing with mixed-voltage field devices.

Robust Design for Mission-Critical Environments:
Built to withstand the rigors of power plants and industrial facilities, the WESTINGHOUSE 1C31169G02 features conformal-coated circuitry, wide operating temperature tolerance, and immunity to EMI/RFI per IEC 61000 standards. Its opto-isolated inputs reject common-mode noise and prevent fault propagation from field wiring to the control system backbone.

Seamless Integration with OVATION Architecture:
The WESTINGHOUSE 1C31169G02 requires no configuration jumpers or DIP switches—module identity and channel mapping are handled automatically by the OVATION controller during startup. This plug-and-play behavior simplifies spares management and enables rapid replacement during maintenance windows without engineering rework.

Diagnostics and Maintainability:
Each channel on the WESTINGHOUSE 1C31169G02 includes a front-panel LED for instant visual verification of signal state, accelerating troubleshooting. The module supports hot-swapping in redundant OVATION I/O chassis, allowing replacement without powering down the entire I/O rack—a key advantage in continuous-process operations.

Long-Term Lifecycle Support:
Despite being part of a legacy product line, the WESTINGHOUSE 1C31169G02 benefits from Emerson’s industrial lifecycle policy, ensuring availability of genuine replacements and technical documentation for decades beyond initial production—essential for asset owners managing 30+ year plant lifespans.

Application Field

The WESTINGHOUSE 1C31169G02 is extensively deployed in thermal power generation facilities, including coal-fired, natural gas combined-cycle, and nuclear plants, where it monitors critical binary states such as turbine trip signals, generator breaker positions, pump running status, and flame detection relays. In these environments, the module’s noise immunity and isolation integrity ensure that transient events—like switchgear arcing or motor startups—do not cause false trips or data corruption in the control system.

Beyond power, the WESTINGHOUSE 1C31169G02 is also found in oil refineries and petrochemical complexes, interfacing with emergency shutdown (ESD) panels, compressor status circuits, and tank level switches. Its compliance with functional safety practices (though not a certified SIL device itself) makes it suitable for basic process control layers that feed into higher-level safety instrumented systems (SIS).

In municipal infrastructure, such as wastewater treatment plants, the WESTINGHOUSE 1C31169G02 acquires signals from motor control centers (MCCs) and remote I/O panels across vast geographic footprints. The module’s ability to operate reliably over extended cable runs—thanks to its high input threshold and noise rejection—reduces the need for intermediate signal conditioners. Across all these sectors, the WESTINGHOUSE 1C31169G02 continues to serve as a dependable, cost-effective solution for discrete signal acquisition in legacy OVATION DCS installations undergoing life extension rather than full migration.

WESTINGHOUSE 1C31169G02

Related Products

• 1C31166G01: OVATION I/O carrier chassis that hosts the1C31169G02 and other I/O modules

• 1C31170G02: 32-channel digital output (DO) module—complementary counterpart to the1C31169G02

• 1C31189G01: 16-channel analog input (AI) module for 4–20 mA signals in the same OVATION platform

• 1C31203G01: Redundant power supply module for OVATION I/O chassis

• 1C31169G01: Earlier revision of the same 32-channel DI module (verify compatibility before substitution)

• OVATION CPU Modules (e.g., 1C31115G01): Central controllers that communicate with the1C31169G02 via backplane

• Emerson DeltaV S-series DI Cards: Modern alternative for new projects migrating from OVATION