Technical Specifications Input Signal Type: Thermocouple signal, millivolt analog signal Input Voltage Range: ‑100 mV to +100 mV Input Impedance: Greater than 10 MΩ 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
Functional Features Supports multi‑channel thermocouple and millivolt signal acquisition. Built‑in cold‑junction compensation for thermocouple temperature measurement. Provides hardware filtering to suppress industrial electromagnetic interference. Channel‑to‑channel and field‑to‑backplane galvanic isolation. Built‑in comprehensive self‑diagnosis for channel open‑circuit, power supply and internal circuit faults. Supports hot‑swap operation under system running status. 
Application Scenarios Process industry distributed control system (DCS). Temperature monitoring for oil & gas, petrochemical plants. Thermocouple‑based furnace and reactor temperature measurement. Chemical plant process loop temperature acquisition. Power plant boiler and thermal equipment temperature monitoring. Critical manufacturing analog signal safety monitoring loops.
Structural Characteristics Standard single‑slot plug‑in structure matching Foxboro I/A Series rack. Front panel with status indicator LED lamps for power, channel fault and fieldbus communication. Field signal terminals located at module front side for wiring maintenance.
Working Principle Field thermocouple or millivolt signals enter through terminal connectors. Hardware filter circuits eliminate high‑frequency interference signals. Isolation circuits complete electrical isolation between field circuit and internal logic circuit. Signal conditioning circuit amplifies weak millivolt signals, and cold‑junction compensation circuit compensates thermocouple reference junction temperature. Processed digital measurement data is transmitted to main control processor via HDLC fieldbus.
Installation Requirements Install the module into designated slot of Foxboro I/A Series standard rack. Ensure rack ground connection strictly follows system grounding specification. Field signal wiring must use shielded twisted‑pair cables. Separate power cable and signal cable routing to avoid crosstalk.
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