Key Specifications
|
Specification
|
Detail
|
|---|---|
|
Brand
|
Reliance
|
|
Model
|
57C332A
|
|
Platform
|
Reliance AutoMax DCS / DCS 5000
|
|
Channel Count
|
16 discrete inputs
|
|
Nominal Input
|
24 VDC
|
|
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)
|
|
OFF Range
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0–5 VDC
|
|
Input Current
|
~4–6 mA per point @ 24 V
|
|
Isolation
|
Optocoupler, field-to-backplane (≈1500 Vrms typical listing)
|
|
Commoning
|
Shared 0 V common (group-isolated from logic)
|
|
Response
|
< 10 ms typical (listing value)
|
|
Indicators
|
Per-channel LED + module power LED
|
|
Backplane
|
AutoMax proprietary parallel I/O bus
|
|
Mounting
|
AutoMax I/O chassis slot (e.g. 57C300-series rack)
|
|
Power
|
+5 V logic from rack; 24 V field from external supply
|
|
Temp
|
0 to +60 °C operating; –40 to +85 °C storage
|
Product Overview
In AutoMax panels built in the 1980s–90s (power, water, paper, chemical), the 57C332A-as-DI variant reads 24 VDC discrete signals and passes them to the AutoMax CPU (57C110/57C112/57C114 class) over the backplane. Each channel is opto-coupled to the logic side, so motor-drive transients or contact bounce on the field side do not reach the controller.
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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