Technical Specifications 16 digital input channels, input rated 24 V DC. Back‑plane S800 I/O bus interface. Auxiliary power supplied by I/O rack back‑plane, typical power consumption 3.2 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Group‑wise channel galvanic isolation.
Functional Features Acquires on‑off status of field 24 V DC digital signals. Completes signal isolation and level conversion. Transmits all channel status data to controller via I/O bus. Front‑panel LED shows real‑time status of every input channel. Built‑in hardware self‑diagnosis detects internal circuit failure.
Application Scenarios Digital input spare part for ABB 800xA S800 I/O station. Widely used in petrochemical, power, chemical and water‑treatment automation projects.
Performance Parameters Fast digital signal response. Independent channel LED status indication. Stable S800 bus data transmission performance.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Signal isolation and level conversion assemblies. Back‑plane plug‑in connector and field signal terminal base.
Structural Characteristics Standard S800 rack plug‑in module. Front side equipped with channel status LED indicators, matched external signal terminal unit. Rear side fitted with back‑plane I/O bus connector. Weight approximately 0.33 kg.
Working Principle Field 24 V DC switching signals access module through terminal base. Internal isolation circuit completes signal level conversion. Channel status data is encoded and uploaded to controller over S800 bus.
Installation RequirementsInsert DI821 3BSE008550R1 into corresponding I/O rack slot and lock fixing latch. Install matched signal terminal base and connect field digital wiring. Ensure back‑plane connector is fully engaged. Restore power supply, verify input status response of all 16 channels.
Usage Notes Prevent over‑voltage signal from entering input channels. Confirm field signal wiring polarity. Hot‑plug under powered state is forbidden. Check signal response of each channel after module replacement.
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