Technical Specifications Multi‑channel analog input, supports 4‑20 mA analog current signal. Back‑plane system bus interface. Auxiliary power 24 V DC, typical power consumption 3.9 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Galvanic isolation between field channels and internal bus.
Functional Features Receives standard analog current signals from field transmitters. Completes analog‑to‑digital signal conversion. Transmits digital process data to DCS controller via back‑plane bus. Channel‑level LED indicates signal and fault status. Built‑in hardware self‑diagnosis detects loop open‑circuit and short‑circuit faults.
Application Scenarios DCS analog input spare part for process industry. Used in petrochemical, power plant and chemical plant process monitoring system maintenance.
Performance Parameters High‑precision analog‑digital conversion. Galvanic isolation suppresses ground loop interference. Reliable channel fault identification.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Signal conditioning and conversion assemblies. Back‑plane plug‑in connector and field wiring screw terminals.
Structural Characteristics Standard rack‑mount plug‑in module. Front side fitted with field wiring terminals and status LED indicators. Rear side equipped with back‑plane bus connector. Weight approximately 0.38 kilogram.
Working Principle Field transmitter analog current signal enters module through front‑end terminals. Internal conversion circuit converts analog quantity into digital data. Digital data is uploaded to DCS controller through back‑plane bus. Diagnosis circuit continuously monitors each input channel loop status.
Installation Requirements Disconnect rack auxiliary power before replacement. Insert 8C‑PAINA1 into corresponding rack slot and lock fixing latch. Complete shielded field signal wiring on front‑end terminals. Confirm back‑plane connector is fully engaged. Restore power supply, perform channel signal calibration and data reading verification.
Usage Notes Use shielded twisted‑pair cable for field analog signal wiring. Separate signal cables from high‑voltage power cables. Check terminal tightening torque during periodic maintenance. Avoid condensation and corrosive gas environment.
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