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1️⃣Key Specifications
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Specification
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Detail
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|---|---|
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Brand
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GE
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Model
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IS420YDIAS1B
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Platform
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Mark VIe / Mark VIeS Functional Safety
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Type
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Discrete Contact Input I/O Pack
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Channels
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24 discrete / dry-contact inputs
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Field Voltages
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24 VDC, 48 VDC, or 125 VDC (terminal-board dependent)
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Isolation
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1500 V optical, field-to-logic (inputs not isolated from each other)
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Input Threshold
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50 % of wetting voltage, clamped 13 % min; under-voltage alarm < 40 % nominal
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Filtering
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Hardware filter + hysteresis (4 ms typical, variant-dependent)
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SOE
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1 ms timestamping over IONet (system-dependent)
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Network
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Dual RJ-45 IONet (10/100 Mbps, R/S/T fabric)
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Terminal Board I/F
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DC-37 pin to STCI/TBCI/TBDI boards
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Power
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24/28 VDC via 3-pin connector, typ. ≤ 6.8 W
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Redundancy
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Simplex / Dual / TMR (1, 2, or 3 packs per signal path)
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Indicators
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Per-channel yellow LED + PWR / ENET1 / ENET2 / ATTN
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Coating
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S-style conformal (humidity/salt/fungus resistant)
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Temp
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-40 to +70 °C operating; -40 to +85 °C storage
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Config Tool
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ToolboxST / ControlST V06.01+
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Safety
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SIL 2 / SIL 3 capable in Mark VIeS; ATEX Zone 2 / Class I Div 2 (S1B rev)
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2️⃣Core Features
- 24-channel contact acquisition with per-point LED and hysteresis
- 1500 V opto-isolation per channel to logic side
- Adaptive wetting-voltage threshold + under-voltage annunciation
- Automatic 4 s optocoupler continuity self-test
- Dual IONet ports for redundant controller fabric
- Direct mount on Mark VIeS terminal board via DC-37; no ribbon cable
- Simplex / dual / TMR voting done in controller, pack is stateless I/O endpoint
- S-conformal coating for turbine-hut / offshore environments
3️⃣Typical Applications
- Gas / steam turbine permissive & trip contact input (lube oil, overspeed, flame, breaker aux)
- Mark VIeS safety shutdown logic (SIS layer of turbine protection)
- Compressor train interlock acquisition
- Hydro governor gate-position contacts
- Retrofit of Mark V → Mark VIe I/O packs where STCI/TBCI boards retained
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