Technical Specifications Multi‑channel analog output, supports 4‑20 mA signal. Back‑plane system bus interface. Auxiliary power 24 V DC, typical power consumption 4.5 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Galvanic isolation exists between field channels and internal system bus.
Functional Features Receives digital setpoint values from DCS controller through back‑plane bus. Executes high‑accuracy digital‑to‑analog conversion and generates standard analog output signals. Front‑panel LED displays channel output status and module fault information. Built‑in hardware self‑diagnosis detects output loop overload, open‑circuit and short‑circuit faults.
Application Scenarios DCS analog output spare part for process industry. Widely deployed in petrochemical, power and pulp‑paper plant regulating control loop maintenance.
Performance Parameters High‑resolution digital‑to‑analog conversion. Stable analog signal output under industrial interference environment. Reliable channel fault detection performance.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Digital‑to‑analog conversion and signal driving assemblies. Back‑plane plug‑in connector and field wiring screw terminals.
Structural Characteristics Standard S800 rack plug‑in module. Front side equipped with field output terminals and status LED indicators. Rear side fitted with back‑plane bus connector. Weight approximately 0.43 kilogram.
Working Principle Digital control data transmitted from DCS controller enters module via back‑plane bus. Internal conversion circuit converts digital quantity into analog current signal. Analog signal is delivered to field actuators through front‑end terminals. Diagnosis circuit continuously monitors operating status of each output channel loop.
Installation Requirements Insert AO845A into corresponding rack slot and lock fixing latch. Complete field actuator shielded wiring on front‑end terminals. Confirm back‑plane connector is fully engaged. Restore power supply, finish channel calibration and verify field actuator adjustment action.
Usage Notes Match field actuator load parameters with module technical specification. Adopt shielded twisted‑pair cables for analog signal wiring. Separate signal cables from high‑voltage power cables.
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