Technical Specifications 8‑channel digital output, rated output 24 V DC. Back‑plane S800 I/O bus interface. Auxiliary power supplied from I/O rack, typical power consumption 3.5 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Group‑wise channel isolation.
Functional Features Receives output control commands from DCS controller via S800 back‑plane bus. Outputs 24 V DC driving signals to field load equipment. Front‑panel LED displays real‑time status of each output channel. Built‑in hardware self‑diagnosis detects over‑current and internal circuit faults.
Application Scenarios Digital output spare part for ABB 800xA S800 I/O station. Applied in various process industry automation control cabinets.
Performance Parameters Fast command response speed. Reliable 24 V DC load driving capability. Accurate channel fault detection function.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Output driving and signal isolation assemblies. Back‑plane plug‑in connector and matched 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 0.34 kg.
Working Principle Controller transmits output commands to DO818 over S800 I/O bus. Internal driving circuit turns on or off corresponding output channel, provides 24 V DC power for field load. Diagnosis circuit monitors channel over‑current condition and module hardware status continuously.
Installation Requirements Insert DO818 into corresponding I/O rack slot and lock fixing latch. Install matched terminal base and connect field load wiring. Ensure back‑plane connector is fully engaged. Restore power supply, verify on‑off action of each output channel.
Usage Notes Do not exceed single‑channel rated output current. Prevent output channel short‑circuit damage. Hot‑plug under powered state is forbidden. Check driving performance of all output channels after module replacement.
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