1️⃣Key Specifications
|
Specification
|
Detail
|
|---|---|
|
Brand
|
GE
|
|
Model
|
531X304IBDAMG1
|
|
Platform
|
Mark VIe / Mark VIeS Functional Safety
|
|
Type
|
Discrete Contact Input I/O Pack
|
|
Channels
|
24 discrete / dry-contact inputs
|
|
Field Voltages
|
24 VDC, 48 VDC, or 125 VDC (terminal-board dependent)
|
|
Isolation
|
1500 V optical, field-to-logic (inputs not isolated from each other)
|
|
Input Threshold
|
50 % of wetting voltage, clamped 13 % min; under-voltage alarm < 40 % nominal
|
|
Filtering
|
Hardware filter + hysteresis (4 ms typical, variant-dependent)
|
|
SOE
|
1 ms timestamping over IONet (system-dependent)
|
|
Network
|
Dual RJ-45 IONet (10/100 Mbps, R/S/T fabric)
|
|
Terminal Board I/F
|
DC-37 pin to STCI/TBCI/TBDI boards
|
|
Power
|
24/28 VDC via 3-pin connector, typ. ≤ 6.8 W
|
|
Redundancy
|
Simplex / Dual / TMR (1, 2, or 3 packs per signal path)
|
|
Indicators
|
Per-channel yellow LED + PWR / ENET1 / ENET2 / ATTN
|
|
Coating
|
S-style conformal (humidity/salt/fungus resistant)
|
|
Temp
|
-40 to +70 °C operating; -40 to +85 °C storage
|
|
Config Tool
|
ToolboxST / ControlST V06.01+
|
|
Safety
|
SIL 2 / SIL 3 capable in Mark VIeS; ATEX Zone 2 / Class I Div 2 (S1B rev)
|
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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