Product Overview
The Westinghouse 5X00357G04 is an Event Input Contact Module within the Westinghouse (now Emerson Ovation) DCS I/O family, purpose-built for Sequence of Events (SOE) capture in power-generation and heavy-process DCS nodes. While standard Ovation digital-input modules sample at the controller scan rate (typically 50–100 ms), the Westinghouse 5X00357G04 is the “fast DI” tier: it time-stamps dry-contact transitions at the module level (1 ms class resolution, driven by the Ovation I/O-drop’s time-sync from the OC/OCR controller, which in turn gets IRIG-B or NTP from the plant time master), then ships the time-stamped edge up to the Ovation historian so a turbine-trip sequence — “protection relay A contact picked up at T+0 ms, breaker-aux 52a dropped at T+37 ms, lube-oil pump contactor picked up at T+2100 ms” — is reconstructable to 1 ms granularity. This is the regulatory-grade SOE that NERC PRC-002 and plant-level turbine-insurance audits ask for.
The Westinghouse 5X00357G04 accepts 24 V DC dry-contact inputs — the field side is typically protection-relay Form-C aux contacts, breaker 52a/52b, turbine-trip solenoids, diesel-generator start contacts, ESD pushbutton series contacts, fire-main pump contactors — anything that is a volt-free contact pulled to 24 V DC (or sink, depending on the Ovation I/O drop’s common wiring schema — most 5X00357 drops are source=24 V DC, contact closes to return, but verify the plant’s I/O wiring practice). Channel count per Westinghouse 5X00357G04 is typically 16 or 32 depending on the drop hardware variant (Ovation I/O drop D-type vs. legacy WDPF-II drop — the 5X00357 G04 straddles late WDPF-II and early Ovation, so some drops are 16-ch, some 32-ch; the G04 suffix is the later Ovation-aligned PCB). Each channel has an individual LED (on = contact closed) and per-channel debounce (configurable in the Ovation drop configuration tool, typical 1–10 ms programmable, to reject contact bounce on breaker aux and relay c/o).
In system terms, the Westinghouse 5X00357G04 plugs into an Ovation I/O rack (or legacy WDPF-II drop rack with Ovation retrofit backplane), draws 24 V DC from the I/O drop’s aux supply, and talks to the OC (Ovation Controller) or OCR (Redundant Ovation Controller) over the Ovation I/O bus (redundant fiber or copper per drop class). The module is hot-swappable on compatible drop carriers — a key maintenance advantage in 24/365 turbine houses where an SOE module swap can’t wait for a planned outage. From a lifecycle view, the Westinghouse 5X00357G04 is a legacy/A-class spare: Westinghouse automation became Emerson Ovation (2006 acquisition of the Power Business from Siemens-Westinghouse split), and the 5X00357 family is still serviced by Emerson but new Ovation SOE drops spec the newer 1C312xx / 5X00xxx event modules. Plants running late-WDPF-II or early-Ovation (2000–2012 vintage) turbines, boilers, balance-of-plant still hold the Westinghouse 5X00357G04 as the active spare — last-time-buy recommended before NOS dries.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | Westinghouse 5X00357G04 |
| Manufacturer | Westinghouse (Emerson Ovation inherited) |
| Product Type | Event Input Contact Module (SOE Dry-Contact Input) |
| Series | Westinghouse 5X00357 (Ovation / WDPF-II I/O) |
| Application | Sequence of Events (SOE) capture, Ovation DCS |
| Input Type | 24 V DC dry contact (volt-free), sinking/sourcing per drop wiring |
| Number of Channels | 16 or 32 (depends on drop hardware variant; G04 typically 32-ch Ovation drop) |
| Time Resolution | 1 ms class (module-level time-stamp, sync from OC/OCR via I/O bus) |
| Channel Debounce | Configurable per channel, 1–10 ms typical (Ovation drop config) |
| Indicators | LED per channel (On = contact closed) + Module Health / Comm LED |
| Bus Interface | Ovation I/O Bus (to OC / OCR controller) |
| Redundancy | Compatible with redundant I/O drop / redundant OC(OCR) |
| Supply Voltage | 24 V DC (from I/O drop aux) |
| Hot-Swap | Supported on compatible Ovation I/O carriers |
| Mounting | Ovation I/O rack / WDPF-II drop rack (DIN / backplane) |
| Operating Temp. | –20 to +60 °C (typical Ovation I/O spec) |
| Storage Temp. | –40 to +85 °C |
| Humidity | 5%–95% RH, non-condensing |
| Compatible Controller | Ovation OC / OCR (OC4000, OC1100, etc.) |
| Legacy Compatible | WDPF-II drops with Ovation retrofit backplane (G04 is the Ovation-aligned rev) |
| Related Siblings | 5X00357G03, 5X00357G05 (same family, minor rev/config diffs) |
| Typical Deployments | Turbine trip SOE, breaker 52a/52b, protection-relay aux, diesel start, ESD contact |