Description
Technical Specifications
- Channel Quantity: 8 isolated dry contact input channels
- Internal Sensing Circuit: 24 VDC low-current sense voltage supplied by DCS internal circuit
- Contact Detection: Identifies open / closed passive mechanical contacts (limit switches, proximity relays, door interlocks)
- Channel Isolation: 1500 VAC isolation per channel
- Diagnostic Function: Open wire fault detection for each field wiring loop
Structural Characteristics
Integrated wire strain relief brackets, transparent terminal safety cover, front panel per-channel status LED indicators, anti-mismatch mechanical coding key.
Working Principle
Internal 24VDC low-power sensing circuit applies weak voltage across field dry contact terminals; when mechanical contact closes, current loop forms, optocoupler converts conduction state to digital input logic signal for DeltaV controller processing.
Typical Applications
- Valve limit switches, equipment safety interlock doors, low-voltage proximity sensors, cabinet thermal alarm switches
- Food & beverage, pharmaceutical, water treatment low-voltage discrete control systems
Operation Precautions
- Do not connect external AC/DC power sources to dry contact terminals; external voltage will burn internal sensing circuits
- Keep field contact wiring length under 100 meters to avoid leakage current false triggering
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