Westinghouse WDPF Modules: 1C31232G01 Digital Input & Full Series Specs, Models & Availability

Technical Dossier

Product Details And Specifications

Westinghouse WDPF Series: Comprehensive Module Range and Technical Overview

The Westinghouse WDPF (Westinghouse Distributed Processing Family) is a distributed control system platform deployed across heavy industrial sectors globally, including petrochemical refineries, nuclear power stations, fossil fuel power plants, and large-scale chemical processing facilities. Originally developed by Westinghouse Electric Corporation and later maintained under Emerson Electric after the acquisition of the process control division, the WDPF platform represents one of the most widely installed legacy DCS architectures in North American and European baseload power generation infrastructure. Installed base estimates place WDPF systems in hundreds of facilities with operational lifespans routinely exceeding 25–30 years, making spare parts availability a critical operational concern for plant maintenance engineers and reliability teams.

The Evolution of WDPF Architecture

The WDPF platform was introduced in the early 1980s as a modular, rack-based distributed control system designed around the WEStation operator interface and the WDPF Data Highway — a proprietary coaxial token-passing network. The architecture evolved through several generations:

WDPF I (Early 1980s): Initial deployment with discrete analog and digital I/O modules, 8-bit processing, and the original WDPF Data Highway at 1 Mbps. Modules in this generation used the 1C31 prefix and were housed in standard 19-inch rack enclosures with passive backplanes.

WDPF II (Late 1980s–1990s): Expanded I/O density, introduction of the Ovation predecessor architecture, enhanced diagnostics, and support for HART field device communication on select analog modules. The 1C31 and 1C32 module families were consolidated and extended during this period.

WDPF/Ovation Transition (2000s): Westinghouse Process Control (later Emerson) introduced the Ovation DCS as the strategic successor to WDPF. Migration paths were defined, but the installed base of WDPF hardware remained in service at the majority of sites due to the capital cost of full platform replacement. Compatibility between WDPF backplanes and Ovation I/O modules is limited and site-specific.

Current Status (2010s–Present): The WDPF platform is classified as end-of-life by Emerson. No new hardware is manufactured. Lifecycle support is available only through third-party MRO suppliers. Plants operating WDPF systems are in one of three states: active migration to Ovation or third-party DCS, hybrid operation with selective module replacement, or full legacy maintenance with spare parts sourcing as the primary strategy.

WDPF Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced modules within the Westinghouse WDPF platform. Modules are categorized by functional type.

Digital Input (DI) Modules

1C31232G01: 32-channel 24VDC digital input module, isolated, standard density, rack-mount.
1C31232G02: 32-channel 48VDC digital input module, isolated, alternate voltage variant.
1C31234G01: 16-channel digital input module, high-voltage AC input, 120VAC rated.
1C31227G01: Digital input module, 32-channel, non-isolated, standard WDPF backplane interface.

Digital Output (DO) Modules

1C31233G01: 32-channel 24VDC digital output module, sourcing type, standard current rating.
1C31233G02: 32-channel 24VDC digital output module, sinking type configuration.
1C31235G01: 16-channel relay output module, Form C contacts, 2A per channel.
1C31228G01: Digital output module, 32-channel, non-isolated, direct backplane drive.

Analog Input (AI) Modules

1C31113G01: 16-channel analog input module, 4–20mA, 12-bit resolution, HART-ready.
1C31113G02: 16-channel analog input module, ±10VDC voltage input range variant.
1C31116G01: 8-channel analog input module, thermocouple types J/K/T/E/R/S/B, cold junction compensated.
1C31129G01: 8-channel RTD input module, 3-wire PT100 configuration, 16-bit resolution.

Analog Output (AO) Modules

1C31114G01: 8-channel analog output module, 4–20mA, 12-bit resolution, loop-powered.
1C31114G02: 8-channel analog output module, ±10VDC voltage output variant.

Controller / CPU Modules

1C31166G01: WDPF process controller module, primary CPU, dual-redundancy capable.
1C31166G02: WDPF process controller module, redundant pair secondary unit.
1C31197G01: Enhanced process controller, later WDPF II generation, expanded memory.

Communication & Network Modules

1C31238G01: WDPF Data Highway interface module, coaxial network, token-passing protocol.
1C31194G01: Serial communication module, RS-232/RS-485, multi-drop configuration support.

Power Supply Modules

1C31222G01: WDPF rack power supply, 24VDC output, standard capacity, single-slot.
1C31222G02: WDPF rack power supply, redundant configuration variant, hot-swap capable.

Sourcing Hard-to-Find & Obsolete WDPF Parts

DriveKNMS maintains a dedicated inventory program for end-of-life Westinghouse WDPF modules. Because Emerson has formally discontinued manufacturing support for the WDPF platform, the global supply of serviceable modules is finite and sourced exclusively from decommissioned plant equipment, authorized surplus channels, and tested pull inventory.

DriveKNMS lifecycle support for WDPF includes: verified stock of high-demand modules including 1C31232G01, 1C31113G01, 1C31166G01, and 1C31233G01; cross-reference matching for G01/G02 variant substitutions where electrically compatible; module-level repair and refurbishment for select CPU and communication modules; and documented traceability records for nuclear and regulated facility procurement requirements.

For plants operating under extended maintenance agreements or preparing for phased Ovation migration, DriveKNMS can provide multi-year supply commitments on critical WDPF spare parts to support planned maintenance outage schedules.

Quality Control for the WDPF Range

WDPF modules present specific test challenges due to the proprietary backplane communication protocol and the age-related failure modes common in 30+ year-old industrial electronics. DriveKNMS applies the following test procedures to all WDPF inventory:

Backplane Interface Verification: Each module is seated in a functional WDPF rack and interrogated via the Data Highway protocol to confirm backplane register read/write integrity and module address response.

Channel-Level I/O Functional Test: For digital modules, all 32 channels are individually stimulated and verified for correct state reporting. For analog modules, calibrated signal sources are applied across the full input range (0–20mA or ±10VDC) and output accuracy is measured against the 12-bit specification.

Capacitor and Power Rail Inspection: Electrolytic capacitors on the DC-DC converter stages are inspected for ESR degradation. Power rail voltages (±15VDC, +5VDC) are measured under load conditions.

Thermal Cycling: Modules flagged for intermittent fault history are subjected to thermal cycling between 0°C and 55°C to identify cold-solder or delamination failures before shipment.

Firmware Revision Logging: Where accessible, firmware revision codes are recorded and disclosed to the customer to ensure compatibility with the target rack controller revision.