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GE 872D496G‑1

Product Name:​ Mark V Analog Output / Driver Circuit Board (Genius I/O class)
Introduction:​ Legacy Speedtronic Mark V signal conditioning and analog output board used to drive turbine auxiliary actuators and interface with external DCS/analog instruments.
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Detailed content

Technical Specifications:
  • Output Channels:​ 4 independent analog outputs
  • Signal Range:​ Software selectable 0–10 VDC or 4–20 mA active/passive
  • Resolution:​ 12‑bit DAC
  • Accuracy:​ ±0.2 % FS at 25 °C
  • Response Time:​ ≤20 ms
  • Bus:​ GE Genius I/O Bus
  • Excitation:​ Backplane 24 VDC / 5 VDC logic
  • Temp Range:​ 0–60 °C cabinet ambient
    Functional Features:
  • Programmable output clamping (high/low limit)
  • Fail‑freeze or fail‑zero on comms loss
  • Onboard LED per channel and bus status
    Working Principle:​ Receives digital setpoints from Mark V controller over Genius Bus, converts to isolated analog drive, feeds valve positioners or meter loads.
    Structure:​ Long FR‑4 card, edge connector + onboard terminal header, jumpers for current/voltage mode.
    Installation:​ Seat in Mark V VME slot, torque terminal screws to 0.6 N·m, separate analog wiring from 480 VAC runs.
    Precautions:​ Do not mix 872D496G‑1 with 872D495‑B without checking firmware/loop config; verify loop load resistance <600 Ω for 4–20 mA.

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