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3A99857G03（Westinghouse Q‑Line QHS‑R 486 Analog Output Module）

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3A99857G03（Westinghouse Q‑Line QHS‑R 486 Analog Output Module）
June 08, 2026

3A99857G03（Westinghouse Q‑Line QHS‑R 486 Analog Output Module）

3A99857G03 is a legacy 8‑channel isolated analog output (AO) module from the Westinghouse (now Emerson) Q‑Line series, designated as QHS‑R 486 (56ACE) for right‑side slot installation in WDPF/Ovation DCS racks. It provides precision 4–20 mA / 0–10 VDC control signals to valves, actuators, and field devices in power generation, petrochemical, and heavy process industries, serving as a reliable replacement part for legacy systems.

Description

Specifications

  • Manufacturer: Westinghouse (Emerson)

  • Model: 3A99857G03 (QHS‑R 486 / 56ACE)

  • Type: Analog Output Module (AO)

  • Architecture: Q‑Line (QHS‑R, right‑side slot)

  • Channels: 8 isolated channels

  • Resolution: 12‑bit

  • Output Ranges: 4–20 mA (default), 0–20 mA, 0–10 VDC (software/configurable via DIP switches)

  • Isolation: 1000 Vrms channel‑to‑ground

  • Accuracy: ±0.1% of full scale at 25 °C

  • Operating Temperature: 0 °C to 60 °C

  • Power Supply: 24 VDC ±10%, 6 W typical

  • Form Factor: Standard Q‑Line card, rack‑mounted

  • Status Indicators: LED for power, communication, and fault

  • Compatibility: WDPF, Ovation DCS (legacy systems)

  • Weight: Approx. 1.0 kg

Key Features

  • Right‑Slot Design: Optimized for right‑side Q‑Line rack slots, paired with 3A99857G02 (left‑slot) for full rack I/O.

  • Isolated Channels: Reduces electrical noise and crosstalk in harsh industrial environments.

  • Field Configurability: Output ranges adjustable via DCS software or onboard DIP switches for flexible device compatibility.

  • Diagnostic LEDs: Real‑time visual status for power, communication, and fault conditions to simplify troubleshooting.

  • Legacy Reliability: Engineered for long‑term operation in critical infrastructure (power plants, refineries).

  • Hot‑Swap Support: Online replacement without system shutdown for minimal downtime.

Applications

  • Power generation (boiler/turbine control, plant auxiliary systems)

  • Petrochemical refining and process automation

  • Water/wastewater treatment plants

  • Heavy manufacturing process control

Related Part Numbers

  • 3A99857G01: QHS‑R 486 analog output (older revision)

  • 3A99857G02: QHS‑L 486 analog output (left‑side slot)

  • 3A99857G04: QHS‑L 486 analog output (alternate revision)

  • 3A99858G01: QHS‑R 486 combined analog input/output module

Notes

  • This is a legacy module, primarily used as a replacement/spare part for existing WDPF/Ovation installations.

  • For new projects, Emerson recommends modern Ovation I/O modules (e.g., 3A99795H25) for enhanced performance and diagnostics.


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