Technical Specifications Multi‑channel pulse input, supports high‑speed pulse signal. Back‑plane S800 I/O bus interface. Auxiliary power supplied by I/O rack, typical power consumption 3.7 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Channel‑wise signal isolation.
Functional Features Receives pulse signals from field pulse generating instruments. Executes high‑speed pulse counting and frequency calculation. Transmits counting result data to controller via S800 I/O bus. Front‑panel LED indicates pulse signal input status and module fault condition. Built‑in hardware self‑diagnosis detects input loop abnormality and internal hardware faults.
Application Scenarios Pulse counting spare part for ABB 800xA S800 I/O station. Applied in flow measurement, rotating speed monitoring and pulse‑signal acquisition projects of process industry.
Performance Parameters High‑frequency pulse signal acquisition capability. Accurate pulse counting performance. Stable counting‑value data transmission.
Material Composition Flame‑retardant plastic module housing. Multilayer glass‑fiber epoxy printed circuit board. Pulse capture, counting processing 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 pulse input status LED indicators, matched external signal terminal unit. Rear side fitted with back‑plane I/O bus connector. Weight approximately 0.36 kg.
Working Principle Field pulse signals access DP840 through terminal base. Internal hardware circuit captures each pulse edge and completes cumulative counting. Counting value and frequency data are uploaded to controller via S800 bus.
Installation Requirements Insert DP840 into designated I/O rack slot and lock fixing latch. Install matched terminal base and connect field pulse instrument wiring. Confirm back‑plane connector is fully engaged. Restore power supply, set pulse parameter and verify counting accuracy.
Usage Notes Set pulse input parameters consistent with field instrument specification. Use shielded cable for pulse signal wiring to reduce interference. Hot‑plug operation under powered condition is prohibited.
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