404A790H01
404A790H01 is a 16‑Channel Isolated Digital Output Module originally designed by Westinghouse (now Emerson) for the WDPF / Q‑Line / Ovation distributed control systems. It provides dry‑contact relay outputs for switching industrial loads in power, petrochemical, and process automation environments.
Description
Key Features
16 independent relay outputs, isolated channel‑to‑channel and channel‑to‑backplane
Contact rating: 250 VAC / 30 VDC, 10 A resistive; 5 A inductive
Backplane power: 24 VDC ±10%, typical 250 mA
Hot‑swap capable (insert/remove with rack energized)
LED indicators: PWR (green), FAULT (red), CH1–CH16 (yellow)
Fail‑safe: Outputs de‑energize (open) on power loss
Robust construction for industrial temperature ranges: 0 °C to +55 °C
Applications
Power plants (boiler/turbine auxiliary control, interlocks)
Petrochemical and refining (valves, pumps, motor starters)
Water/wastewater treatment (on/off control of actuators)
Status
End‑of‑Life (EOL); no new OEM production. Available as refurbished / used spare parts from authorized vendors.
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