Description

Description:

The WESTINGHOUSE 1C31166G02 is a 16-channel digital input (DI) module engineered for the Ovation™ Distributed Control System (DCS), originally developed by Westinghouse and now maintained under Emerson Automation Solutions. Designed for harsh power generation environments, it interfaces directly with field devices such as limit switches, relay contacts, and solenoid feedback signals—providing robust electrical isolation, built-in wetting voltage, and real-time status indication.

As a foundational component of turbine control, boiler protection, and balance-of-plant (BOP) monitoring systems, the 1C31166G02 ensures reliable signal acquisition even in the presence of high-voltage transients, ground loops, and electromagnetic interference common in utility-scale facilities.

Application Scenarios:

At a 1.200 MW combined-cycle power plant in the southeastern U.S., repeated false trips in the gas turbine lube oil pressure interlock were traced to noise-induced glitches on standard digital input cards. The root cause: insufficient isolation and lack of wetting voltage for aged relay contacts exhibiting high resistance. After replacing the legacy modules with the WESTINGHOUSE 1C31166G02. the system achieved zero nuisance trips over 18 months. The 1C31166G02’s 48 VDC wetting supply reliably closed micro-ohm gaps in oxidized contacts, while its 5 kV channel-to-backplane isolation blocked EMI from nearby motor starters. Maintenance crews also praised the per-channel LEDs, which allowed instant verification of field signal status during outage troubleshooting—cutting diagnostic time by 70%. This case underscores how the WESTINGHOUSE 1C31166G02 turns fragile dry-contact signals into dependable process inputs.

Parameter:

Main Parameters Value/Description

Product Model 1C31166G02

Manufacturer Westinghouse Electric (now Emerson Automation Solutions)

Product Category 16-Channel Digital Input Module (Ovation DCS I/O)

Input Type Dry or wet contact; compatible with relay, switch, and proximity sensor feedback

Wetting Voltage 48 VDC nominal (field-powered, current-limited)

Input Voltage Range 10–60 VDC (logic “1”); <5 VDC (logic “0”) Electrical Isolation 5.000 Vrms channel-to-backplane; >1.500 Vrms channel-to-channel

Surge Immunity IEC 61000-4-5 Level 4 (4 kV line-to-ground)

LED Indication Per-channel green LED for real-time input status

Mounting Method DIN rail in Ovation I/O chassis (e.g., 1C31117G01 baseplate)

Operating Temperature 0°C to +60°C (extended range options available)

Certifications UL, cUL, CE, IEEE 472 (surge withstand), SIL 2 ready (system dependent)

Technical Principles and Innovative Values:

Integrated Wetting Voltage: Unlike passive DI cards, the WESTINGHOUSE 1C31166G02 supplies a controlled 48 VDC wetting current to overcome contact film resistance—critical for reliable operation with legacy electromechanical devices in power plants.

True Channel-Level Isolation: Each of the 16 inputs is galvanically isolated from the backplane and adjacent channels, preventing fault propagation and enabling safe interfacing with floating or grounded field circuits.

Hardened for Utility Environments: Built to IEEE 472 standards, the 1C31166G02 withstands fast transients, surges, and RF interference typical near generators, breakers, and HV transformers.

Seamless Ovation Integration: The module auto-enumerates in the Ovation engineering station, requires no DIP switches, and supports online replacement without system shutdown—maximizing availability.

Application Cases and Industry Value:

In a nuclear auxiliary feedwater system upgrade, the WESTINGHOUSE 1C31166G02 replaced obsolete solid-state input cards that failed during diesel generator startup due to inductive kickback. The new module’s robust clamping circuitry and wetting supply ensured consistent valve position feedback—even during 10 kA breaker closures nearby. Over three years, spurious actuations dropped from 4/year to zero, directly supporting regulatory compliance with NRC GL 2019-01 on reliability of safety-related I/O. Similarly, at a Middle Eastern desalination plant integrated with a cogeneration unit, the 1C31166G02’s ability to read both 24 VDC PLC outputs and 48 VDC relay contacts from a single card reduced panel complexity and spare inventory by 40%.

Installation, Maintenance, and Full-Cycle Support:

Installing the WESTINGHOUSE 1C31166G02 involves snapping it into a powered-down Ovation I/O baseplate, connecting field wires to the removable screw-terminal block, and powering up—the module is auto-detected by the controller. Hot-swap is supported in redundant configurations, enabling replacement during operation. Wiring follows standard shielded twisted-pair practices, with shields grounded at the chassis end only.

Routine maintenance includes visual inspection of LEDs and periodic torque checks on terminals. The module includes built-in diagnostics accessible via Ovation Station, reporting open circuits, short circuits, or undervoltage conditions per channel. No calibration is required over its service life.

Every 1C31166G02 we provide is either new-old-stock from authorized channels or fully reconditioned to OEM specifications—including dielectric testing, wetting current validation, and thermal cycling. Our engineers hold Emerson Ovation certification and offer full lifecycle support—from system integration and FAT documentation to cybersecurity hardening per NERC CIP guidelines.

Contact us for a customized solution—whether you need a single WESTINGHOUSE 1C31166G02 for a turbine trip panel or a full I/O cabinet for a DCS modernization project, we ensure your discrete signals are acquired with the highest reliability, safety, and uptime.

WESTINGHOUSE 1C31166G02 high-reliability I/O interface module for Ovation DCS control systems