WESTINGHOUSE 1C31127G01 Rugged Terminal Base Unit Product Introduction

The Westinghouse 1C31127G01 is a field-wiring terminal interface module designed for use within the OVATION™distributed control system(DCS)—a platform originally developed by Westinghouse and now maintained and enhanced by Emerson Automation Solutions.This module serves as the physical and electrical bridge between the OVATION controller’s backplane logic and field devices such as limit switches,solenoid valves,motor starters,and auxiliary relays.

While the 1C31127G01 itself does not contain active processing circuitry(it is typically a passive terminal base or carrier),it is engineered to support high-density discrete I/O cards(e.g.,digital input or output modules)that plug into it.It provides secure screw-terminal field connections,shield grounding,fuse or surge protection options,and often includes LED indicators for signal status when used with compatible I/O modules.

Built to withstand the demanding conditions of power generation,fossil fuel plants,nuclear facilities,and industrial process environments,the 1C31127G01 meets stringent standards for electromagnetic compatibility(EMC),vibration resistance,and long-term operational reliability.

Note:In many OVATION systems,part numbers like 1C31127G01 refer to the terminal base assembly,while the actual I/O functionality comes from a plug-in module(e.g.,1C31114G01 for digital input).Always verify the complete assembly configuration.

Application Scenario

At a 600 MW coal-fired power plant in the Midwest undergoing a WDPF-to-OVATION migration,engineers needed to retain existing field wiring while upgrading control hardware.The Westinghouse 1C31127G01 terminal bases were installed across 12 I/O cabinets to interface new OVATION digital output modules with legacy boiler soot blower solenoids and damper actuators.The 1C31127G01’s robust cage-clamp-style terminals(or screw terminals,depending on revision)allowed reuse of existing 18 AWG field cables without re-termination.Its integrated shield bar minimized ground loops from variable-frequency drives nearby.During commissioning,maintenance staff used the transparent cover and optional status LEDs to verify output states during functional tests—reducing loop-check time by 35%.Over five years of operation,zero terminal-related failures were recorded,proving the 1C31127G01’s role as a silent but critical enabler of seamless DCS modernization.

Technical Parameters

Parameter Value/Description

Model 1C31127G01

Manufacturer Westinghouse Electric Corporation→Now supported by Emerson

System Compatibility OVATION™DCS(and legacy WDPF in some retrofit scenarios)

Function Passive terminal base/field wiring interface for plug-in I/O modules

I/O Type Supported Typically discrete(digital)input or output modules(16-channel common)

Field Connections Screw terminals or spring-cage terminals(varies by revision);supports 14–22 AWG

Isolation Basic reinforced insulation;galvanic isolation provided by the plug-in I/O module,not the base

Shield Termination Integrated shield clamp or bus bar for cable shielding

Mounting DIN rail or direct panel mount within OVATION I/O chassis

Operating Temperature-20°C to+70°C(industrial grade)

Certifications CE,UL 61010,CSA,RoHS(depending on production date)

Dimensions~180 mm H×40 mm W×200 mm D(standard OVATION I/O module footprint)

Key Features Transparent cover,labeling area,modular design,hot-swap capable(with compatible I/O)

Technical Principles&Value Proposition

Legacy Continuity:Enables reuse of field wiring during WDPF or early OVATION upgrades—saving hundreds of engineering hours.

Serviceability:Transparent covers and clear labeling reduce troubleshooting time;modules can often be replaced without de-energizing the entire rack.

Signal Integrity:Dedicated shield termination minimizes noise in electrically noisy power plant environments.

Scalability:Part of a modular I/O ecosystem—same base can support different I/O types with module swaps.

Commonly Paired Modules&System Components

1C31114G01–16-channel digital input module(plugs into 1C31127G01 base)

1C31116G01–16-channel digital output module(sourcing or sinking)

OVATION Controller(e.g.,1C31204G01 CPU)–Central processing unit

Backplane(e.g.,1C31199G01)–Provides power and communication to I/O modules

Power Supply Modules(e.g.,1C31185G01)–Supplies 24 VDC or 48 VDC to I/O racks

Emerson OVATION Engineering Studio–Configuration and diagnostics software

Field Devices:Solenoid valves,limit switches,motor control relays,alarm panels

Installation&Maintenance Guidance

Installation:Mount base on DIN rail inside I/O cabinet;connect field wires to labeled terminals;plug in compatible I/O module.

Wiring Best Practices:Use twisted-pair shielded cable;ground shield at one end only(typically DCS cabinet);avoid routing near high-voltage AC lines.

Maintenance:Inspect terminals annually for corrosion or loosening;verify shield continuity;replace transparent cover if cracked.

Hot-Swap:Supported in redundant OVATION systems—always follow site-specific lockout/tagout(LOTO)procedures.

Conclusion

The Westinghouse 1C31127G01 may appear to be a simple terminal block—but in the context of mission-critical power and process control,it is a foundational element of system reliability and maintainability.By providing a standardized,robust,and serviceable interface between intelligent I/O modules and the physical plant,it continues to play a vital role in both legacy and modernized OVATION installations worldwide.

Note:As Westinghouse’s automation division was acquired by Emerson in the 1990s,current support,firmware,and replacements are handled through Emerson’s OVATION product line.Always confirm compatibility with your specific OVATION release(e.g.,v3.x,v4.x,or v5.x).