Description
DS3800XDIB1A1A: Product Overview
The DS3800XDIB1A1A is a daughterboard-grade digital input interface that plugs onto a motherboard carrier inside the Mark IV rack. It samples 24 V DC dry-contact signals from limit switches, push-buttons, relay contacts, and remote discrete inputs, conditions them (level-shift, filter, isolate), and streams digital status to the CPU over the VME back-plane. The card is hardware-configured (no firmware) and deterministic, making it suitable for safety-related discrete monitoring when triple-redundant .
Physical implementation includes opto-isolated inputs, TVS surge suppressors, pull-up/pull-down networks, and front-edge LEDs (green = input active, red = fault). 20-pin ribbon carries input status and power; keyed and gold-plated to prevent mis-insertion or fretting corrosion under decades of thermal cycling.
Environmental qualification meets –20 °C to +70 °C, IEEE 344 seismic, and CE / RoHS compliance, giving >25-year service life in baseload duty.
DS3800XDIB1A1A
DS3800XDIB1A1A: Technical Specifications
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Model Number: DS3800XDIB1A1A
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Manufacturer: General Electric (GE Energy)
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Product Type: Digital Input / Interface Board
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System Compatibility: Speedtronic Mark IV (6BA01 slot)
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Input Type: 24 V DC dry-contact, opto-isolated
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Input Channels: 16 or 32 (jumper-selectable)
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Isolation: 1500 V AC channel-to-ground, 500 V channel-to-channel
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Surge Protection: TVS diodes on every input, >500 V clamp
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Indicators: Green = input active, Red = fault / open circuit
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Connectors: 20-pin ribbon, keyed, gold-plated
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Power Rails: +5 V logic, +24 V field, <0.3 W per channel
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Temp Range: -20 °C to +70 °C operational, -40 °C to +85 °C storage
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Certifications: CE, RoHS, Mark IV form-factor compatible
Core Features & Customer Value
24 V Dry-Contact Interface for Safety Systems
Opto-isolated inputs accept limit switches, push-buttons, and relay contacts without external interposing relays, reducing wiring complexity and cost by >30 %.
Opto-isolated inputs accept limit switches, push-buttons, and relay contacts without external interposing relays, reducing wiring complexity and cost by >30 %.
Hot-Swappable in TMR Strings
Redundant Mark IV allows online replacement of one input card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Redundant Mark IV allows online replacement of one input card; remaining two legs continue voting. MTTR is <5 min—no outage, no load shed, no restart required.
Field-Configurable Without Software
Jumper-selectable input count, pull-up/down, and filter corner allow technicians to match field devices using only a tweaker and the silk-screen legend, no laptop required.
Jumper-selectable input count, pull-up/down, and filter corner allow technicians to match field devices using only a tweaker and the silk-screen legend, no laptop required.
Surge-Hardened for Turbine Deck
TVS diodes and opto-isolators clamp >500 V spikes from lightning, VFD switching, or exciter flash-over. 1500 V isolation prevents ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with non-isolated input cards.
TVS diodes and opto-isolators clamp >500 V spikes from lightning, VFD switching, or exciter flash-over. 1500 V isolation prevents ground-fault propagation to CPU cards, reducing unplanned replacement by >60 % compared with non-isolated input cards.
DS3800XDIB1A1A
Typical Applications
Gas Turbine Discrete Control & Indication
Primary digital input for Frame 5/6/7/9 heavy-duty units: monitors crank/fire/run mode switches, emergency-stop buttons, and local/remote select during start-up, load ramps, and emergency trips.
Primary digital input for Frame 5/6/7/9 heavy-duty units: monitors crank/fire/run mode switches, emergency-stop buttons, and local/remote select during start-up, load ramps, and emergency trips.
Steam Turbine Auxiliary & Protection Inputs
Discrete inputs for governor mode select, trip solenoid feedback, and local indication in steam turbine Mark IV retrofits. Deterministic input processing prevents false trips during transients.
Discrete inputs for governor mode select, trip solenoid feedback, and local indication in steam turbine Mark IV retrofits. Deterministic input processing prevents false trips during transients.
Remote Site & Island Mode Operation
Long-cable push-button stations (up to 500 m) from offshore pendant controls are automatically compensated, eliminating need for external relay panels and reducing cable count by 40 %.
Long-cable push-button stations (up to 500 m) from offshore pendant controls are automatically compensated, eliminating need for external relay panels and reducing cable count by 40 %.
