Technical Specifications Input Signal Type: 2‑wire, 3‑wire, 4‑wire RTD resistance signal Resistance Input Range: 0 Ω to 400 Ω Input Excitation Current: 0.2 mA typical value Channel Isolation Voltage: 500 V RMS Transient Surge Suppression: 1500 V Operating Power Supply: 24 VDC from system backplane bus Communication Protocol: Proprietary 2 Mbps HDLC fieldbus for I/A Series system Operating Temperature: ‑40 ℃ to +70 ℃ Storage Temperature: ‑50 ℃ to +85 ℃ Relative Humidity: 5%‑95%, non‑condensing Mechanical Dimension: Standard single‑slot plug‑in module for Foxboro I/A Series rack Certifications: CE, UL, ATEX, IEC 61508 functional safety compliance
Functional Features Supports multi‑channel RTD signal acquisition compatible with 2‑wire, 3‑wire and 4‑wire connection modes. High‑precision resistance‑to‑temperature conversion for Pt100, Pt1000, Ni‑series RTD sensors. 
Application Scenarios Process industry distributed control system(DCS). Petrochemical plant reactor and pipeline temperature monitoring loops. Oil & gas processing facility RTD temperature measurement. Chemical plant storage tank temperature monitoring. Power generation thermal equipment temperature acquisition.
Structural Characteristics Standard single‑slot plug‑in structure matching Foxboro I/A Series rack. Front panel equipped with status LED indicators for power supply, channel fault and fieldbus communication. Field RTD signal terminals are arranged on module front side for convenient wiring and maintenance work.
Working Principle Field RTD resistance signals flow into module through front‑side terminal connectors. Hardware filter circuit eliminates high‑frequency interference noise. Isolation circuit completes electrical isolation between field circuit and module internal logic circuit. Constant‑current excitation circuit drives external RTD sensor, sampling circuit converts resistance variation into digital temperature value.
Installation Requirements Insert module into designated slot of Foxboro I/A Series standard rack. Ensure rack ground connection strictly complies with official system grounding specification.
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