Technical Specifications 8‑channel analog current input, support 4‑20 mA signal. Back‑plane bus interface. Auxiliary power 24 V DC, typical power consumption 4.0 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95. Galvanic isolation between field channels and internal system bus.
Functional Features Receives analog current signals from field measurement transmitters. Completes analog‑to‑digital conversion for process signals. Transmits digital measurement data to DCS controller via back‑plane bus. Channel LED displays signal and fault status. Built‑in hardware self‑diagnosis detects field loop open‑circuit and short‑circuit faults.
Application Scenarios DCS analog input spare part for process industry. Applied in power plant, petrochemical and chemical plant process control system maintenance.
Performance Parameters High‑precision analog‑digital conversion accuracy. Effective galvanic isolation restrains ground loop interference. Reliable field loop fault detection capability.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Signal conditioning and A/D conversion assemblies. Back‑plane plug‑in connector and field wiring screw terminals.
Structural Characteristics Standard S800 rack plug‑in module. Front side with field signal terminals and channel status LED indicators. Rear side fitted with back‑plane bus connector. Weight approximately 0.39 kilogram.
Working Principle Field transmitter analog current signal enters module via front terminals. Internal circuit converts analog quantity into digital data. Digital data is uploaded to DCS controller through back‑plane bus. Diagnosis circuit continuously monitors each field input loop condition.
Installation Requirements Insert AI820 3BSE008544R1 into corresponding rack slot and lock fixing latch. Connect shielded field signal cables to front terminals. Confirm back‑plane connector is fully engaged. Restore power supply, perform channel calibration and signal reading verification.
Usage Notes Adopt shielded twisted‑pair cables for field analog signal wiring. Separate signal cables from high‑voltage power cables. Hot‑plug under powered state is forbidden.
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