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GE DS3800DADB1A1A

Product Name:​ Mark IV DADB Dual-Bank Digital Input Daughtercard
Product Introduction:​ 32-channel digital input board for Mark IV; often mounted to NADB or adjacent digital bank; captures dry/wet contact states.
Technical Specifications:
  • Channels: 32 (2 banks × 16)
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Detailed content

  • Input: dry contact or 24 V DC (18–30 V = 1, 0–6 V = 0)
  • Current: ≤ 2 mA/ch
  • Response: ≤ 10 ms
  • Isolation: 500 V DC ch-ch and ch-backplane
  • Debounce: 1–100 ms software filter
  • Event Capture: 1 ms timestamp
  • Power: +5 V from backplane, ≤ 2 W
Functional Features:​ NO/NC per channel, optical isolation, wire-break flag, front LED per channel.
Application Scenarios:​ Limit switches, pushbuttons, breaker aux contacts, pump-run status in Mark IV panels.
Material Composition:​ FR4 high-Tg, Toshiba/Vishay optocouplers, spring terminals, zinc-alloy faceplate.
Structural Characteristics:​ 3U Eurocard, 32 LEDs (2×16), 64-pin VME backplane, top latch.
Working Principle:​ Contact close → current through opto LED → transistor side toggles → scanned by logic → timestamped.
Installation Requirements:​ Spring terminal torque 0.5 N·m; backplane fully seated before +5 V.
Usage Notes:​ Wet 24 V must come from isolated field supply, not backplane 5 V.

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