Technical Specifications Multi‑channel analog input, support 4‑20 mA and voltage input. Back‑plane bus interface. Auxiliary power 24 V DC, typical power consumption 4.3 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Galvanic isolation between field channels and system bus.
Functional Features Acquires analog signals from field process transmitters and sensors. Performs high‑resolution analog‑digital conversion. Uploads digital process data to DCS controller via back‑plane bus. Front‑panel LED shows channel signal and module fault status. Built‑in hardware self‑diagnosis detects field loop open‑circuit and short‑circuit faults.
Application Scenarios High‑precision DCS analog input spare part. Used for precision measurement loops in chemical, power and pulp‑paper industrial control systems.
Performance Parameters High‑resolution analog‑digital conversion performance. Excellent channel isolation effect. Reliable field loop fault detection function.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. High‑precision signal conditioning and conversion assemblies. Back‑plane plug‑in connector and field wiring terminals.
Structural Characteristics Standard S800 rack plug‑in module. Front side fitted with field signal terminals and status LED indicators. Rear side equipped with back‑plane bus connector. Weight approximately 0.41 kilogram.
Working Principle Field analog signals enter module through front‑end wiring terminals. Internal high‑precision circuit converts analog quantity into digital data. Digital measurement values are transmitted to DCS controller through back‑plane bus. Diagnosis circuit continuously monitors operating status of each input channel.
Installation Requirements Cut off rack auxiliary power before replacement. Insert AI845 into designated rack slot and lock fixing latch. Complete field instrument shielded signal wiring. Confirm back‑plane connector is fully engaged. Restore power supply, configure channel parameters and verify measurement precision.
Usage Notes Use high‑quality shielded twisted‑pair cables for field wiring. Keep signal cables away from high‑voltage interference sources. Hot‑plug under powered state is strictly forbidden. Calibrate channel measurement after module replacement.
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