Westinghouse 5X00070G02 Analog Input Module WDPF Series

Technical Dossier

Product Details And Specifications

Westinghouse WDPF 5X00070 Series Technical Notes

The Westinghouse WDPF (Westinghouse Distributed Processing Family) I/O module series, including the 5X00070G02, represents one of the most widely deployed distributed control system (DCS) hardware platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, coal-fired and combined-cycle power plants, and offshore oil & gas facilities, the WDPF platform established the architectural baseline for process automation in facilities commissioned between the late 1980s and early 2000s. The 5X00070 sub-series specifically covers analog input signal conditioning modules designed for 4–20 mA and thermocouple/RTD process variable acquisition. These modules interface directly with the WDPF backplane bus and communicate upstream to the Westinghouse Ovation DCS supervisor layer, making them critical path components in any WDPF-to-Ovation migration or long-term maintenance program.

The Evolution of WDPF 5X00070 Series Architecture

The WDPF platform was introduced by Westinghouse Electric Corporation in the mid-1980s as a modular, rack-based DCS targeting utility-scale power generation. The 5X00070 analog input module family evolved through several hardware revisions (G01 through G05+) to address signal isolation improvements, increased channel density, and enhanced EMI rejection required by nuclear-grade installations. Early G01 variants used discrete op-amp signal chains; G02 and G03 revisions introduced hybrid IC front-ends with improved common-mode rejection ratios (CMRR >120 dB). Later G04/G05 variants added on-board diagnostics and HART pass-through capability for smart transmitter integration.

Following Westinghouse's acquisition by CBS and subsequent divestiture to Siemens and then Emerson, the WDPF platform transitioned into the Ovation DCS ecosystem. Ovation I/O modules (e.g., 5X00106, 5X00119 series) are the designated modern replacements, but direct hardware substitution requires backplane adapter kits and firmware re-mapping. As a result, the majority of operating WDPF sites continue to source original 5X00070-series modules for like-for-like replacement to avoid costly re-engineering outages.

WDPF 5X00070 Full Catalog & Functionalities (SKU List)

Analog Input Modules

• 5X00070G01: 8-channel analog input module, 4–20 mA, first-generation WDPF backplane interface
• 5X00070G02: 8-channel analog input module, 4–20 mA / thermocouple, improved CMRR, standard WDPF rack
• 5X00070G03: 8-channel analog input, enhanced EMI shielding, nuclear-qualified variant
• 5X00070G04: 8-channel analog input with on-board self-diagnostics and HART pass-through
• 5X00070G05: 8-channel analog input, extended temperature range (-20°C to +70°C), offshore-rated

Analog Output Modules

• 5X00071G01: 4-channel analog output, 4–20 mA, WDPF backplane, manual/auto transfer
• 5X00071G02: 4-channel analog output with loop-back verification and fault annunciation
• 5X00072G01: 8-channel analog output, high-density, for valve positioner applications

Digital Input Modules

• 5X00073G01: 16-channel digital input, 24 VDC, dry contact and wet contact configurable
• 5X00073G02: 16-channel digital input, 120 VAC, optically isolated, power plant switchgear interface
• 5X00074G01: 32-channel digital input, high-density, 24 VDC, WDPF rack

Digital Output Modules

• 5X00075G01: 16-channel digital output, 24 VDC, solid-state relay, 0.5 A per channel
• 5X00075G02: 16-channel digital output, 120 VAC, triac output, solenoid valve drive
• 5X00076G01: 8-channel digital output, high-current, 2 A per channel, motor starter interface

Communication & Controller Modules

• 5X00077G01: WDPF data highway interface module, coaxial bus, node controller function
• 5X00078G01: Redundant controller module, dual-CPU, bumpless transfer, WDPF supervisory layer
• 5X00079G01: Power supply module, 24 VDC regulated, rack-mount, WDPF backplane power distribution