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Key Specifications
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Specification
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Detail
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|---|---|
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Brand
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Reliance
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Model
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S-D4012
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Platform
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Reliance AutoMax DCS / DCS 5000
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Channel Count
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16 discrete inputs
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Nominal Input
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24 VDC
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Input Type
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Sinking (current flows into module to 0 V common)
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ON Range
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18–30 VDC (typical listing)
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OFF Range
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0–5 VDC
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Input Current
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~4–6 mA per point @ 24 V
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Isolation
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Optocoupler, field-to-backplane (≈1500 Vrms typical listing)
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Commoning
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Shared 0 V common (group-isolated from logic)
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Response
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< 10 ms typical (listing value)
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Indicators
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Per-channel LED + module power LED
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Backplane
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AutoMax proprietary parallel I/O bus
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Mounting
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AutoMax I/O chassis slot (e.g. 57C300-series rack)
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Power
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+5 V logic from rack; 24 V field from external supply
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Temp
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0 to +60 °C operating; –40 to +85 °C storage
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Core Features
- 16 × 24 VDC sinking inputs in one AutoMax slot
- Opto-isolation between field common and backplane logic
- Per-channel LED status for fast fault isolation
- Direct AutoMax backplane mapping—no gateway, no config file
- Accepts dry contacts or powered 24 V sensors
- Built for long-duty legacy DCS racks (turbine, pump station, water SCADA)
Typical Applications
- AutoMax life-extension spares in hydro / fossil plants
- Municipal water & wastewater SCADA backplane DI
- Paper machine & converting line interlock inputs
- Breaker status, valve limit, E-stop contact acquisition
- Retrofit maintenance where full DCS migration is deferred
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