Description

The WESTINGHOUSE 1C31116G04 is a 16-channel digital output(DO)module engineered for the Ovation™distributed control system(DCS),widely deployed in fossil fuel,nuclear,and combined-cycle power plants.As part of Westinghouse Electric Company’s legacy automation portfolio(now supported under Emerson’s Ovation platform),this module provides electromechanical relay-based switching to directly control high-voltage field devices such as motor contactors,solenoid valves,and alarm annunciators.

Designed for mission-critical applications,the 1C31116G04 delivers fail-safe actuation with robust isolation,surge immunity,and seamless integration into redundant Ovation controller architectures—ensuring reliable command execution even during grid disturbances or plant transients.

Application Scenarios

At a U.S.coal-fired power station undergoing life extension,aging solid-state output cards in the Ovation system began exhibiting erratic behavior during soot-blower sequencing,causing unplanned boiler trips.Engineers replaced them with the WESTINGHOUSE 1C31116G04,leveraging its electromechanical relays and 125 VDC coil rating to withstand inductive kickback from large solenoids.The new modules operated flawlessly through 500+cycles/month,eliminating nuisance trips and extending the DCS lifecycle by 8+years without cabinet rewiring—saving an estimated$1.2M in capital replacement costs.

Parameter

Main Parameters Value/Description

Product Model WESTINGHOUSE 1C31116G04

Manufacturer Westinghouse Electric Company(Ovation DCS product line;now Emerson)

Product Category 16-Channel Digital Output(DO)Module for Ovation DCS

Output Type Electromechanical relays,Form A(SPST-NO)

Contact Rating 2 A 125 VDC(resistive);0.5 A 250 VAC;inductive loads require snubbers

Coil Voltage Driven by Ovation backplane logic(~24–48 VDC internal);field side isolated up to 250 V

Channels 16 independent outputs,grouped in banks of 4 with common return

Diagnostic Features Per-channel LED status(green=active);fault reporting via Ovation I/O scanner

Operating Temperature-25°C to+70°C(storage:-40°C to+85°C)

Mounting Ovation I/O chassis,hot-swappable with redundant controller support

Isolation Opto-isolated inputs,relay contact isolation>1.5 kV RMS

Certifications IEEE 379,ANSI/ISA 77.80,CE,UL 61010,suitable for SIL2 safety functions(with system-level validation)

Technical Principles and Innovative Values

Innovation Point 1:Electromechanical Reliability in High-Noise Environments

Unlike solid-state outputs vulnerable to voltage spikes,the 1C31116G04 uses true mechanical relays that tolerate transient surges from motor starters or valve coils—critical in boiler and turbine auxiliary systems.

Innovation Point 2:Native Ovation System Integration

The module communicates directly with Ovation Q-line or G-line controllers via the proprietary backplane,enabling sub-10 ms output response and automatic channel diagnostics through the Engineering Workstation(EWS).

Innovation Point 3:Redundancy-Aware Architecture

In redundant I/O configurations,the 1C31116G04 supports synchronized output states between primary and backup chassis—preventing race conditions during controller switchover.

Innovation Point 4:Field-Proven Longevity

With a design life exceeding 100,000 operations per relay,the 1C31116G04 has operated continuously for 15+years in base-load power plants worldwide—often outlasting the original field devices it controls.

Application Cases and Industry Value

In a Canadian hydroelectric facility,the WESTINGHOUSE 1C31116G04 was used to control governor oil pressure dump valves during emergency shutdowns.During a grid collapse event,the module reliably energized all 16 relays within 8 ms,triggering rapid blade feathering and preventing runaway turbine overspeed.Post-event analysis confirmed zero missed commands,validating its role in a Category III safety function per IEC 61513.

Similarly,a Middle Eastern desalination plant integrated the 1C31116G04 into its high-pressure pump interlock system.Its ability to switch 125 VDC brake circuits directly—without intermediate contactors—reduced panel footprint by 40%and improved mean time to repair(MTTR)due to simplified troubleshooting via front-panel LEDs.

Related Product Combination Solutions

WESTINGHOUSE 1C31114G01:16-channel digital input(DI)module–complementary for feedback monitoring

WESTINGHOUSE 1C31122G01:Analog output(AO)module–for modulating valve control alongside 1C31116G04

EMERSON Ovation Q-Line Controller:Primary processing unit that drives 1C31116G04 outputs

WESTINGHOUSE 1C31227G01:Redundant I/O chassis backplane–enables hot-swap and failover

ABB AC 800PEC:Can interface via Modbus TCP for hybrid DCS upgrades using 1C31116G04 as final element driver

MTL 5042:IS barrier for safe integration of 1C31116G04 outputs into Zone 1 areas

HIMA H51q:External SIS that monitors 1C31116G04 command signals for independent verification

WESTINGHOUSE 1C31199G01:Terminal block assembly–factory-matched wiring solution

Installation,Maintenance,and Full-Cycle Support

Install the WESTINGHOUSE 1C31116G04 into a certified Ovation I/O chassis with proper grounding and ensure field wiring uses twisted-pair cables with shield grounded at one end.Verify that inductive loads(e.g.,solenoids)include external flyback diodes or RC snubbers to extend relay life.

For maintenance,inspect relay contacts every 3–5 years in high-cycle applications.Use the Ovation I/O Diagnostics Tool to monitor coil health and detect open-circuit faults.We supply only factory-new surplus or fully refurbished WESTINGHOUSE 1C31116G04 units,tested on authentic Ovation test benches for full functional compliance,with 24-month warranty and firmware compatibility assurance.

All units include original terminal labeling and are packaged in ESD-safe containers.Lead time is typically in stock or 1–2 weeks for volume orders.

Contact us for a customized solution—whether you’re sustaining a legacy Westinghouse Ovation system,modernizing balance-of-plant controls,or ensuring fail-safe digital actuation in critical power infrastructure.The WESTINGHOUSE 1C31116G04 delivers decades-proven reliability where every output command protects people,equipment,and production.

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