Technical Specifications Multi‑channel isolated digital input, 24 V DC signal level. Auxiliary power supply 24 V DC. Typical power consumption 3.8 W. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%. Module surface IP20. Meets industrial control I/O module standards.
Functional Features Acquires field discrete switch signals. Provides complete galvanic isolation for each channel. Front‑panel LED indicates real‑time channel input state. Transmits status data via rack back‑plane bus. Built‑in channel fault self‑diagnosis capability.
Application Scenarios Applied for signal collection of field limit switches, relay contacts and equipment status feedback in process industries. Used for new project construction and spare‑part replacement work.
Performance Parameters Signal input response speed satisfies process‑control timing requirement. Isolation voltage resists common‑mode interference. LED gives intuitive status feedback. Self‑diagnosis function detects channel circuit fault.
Material Composition Glass‑fiber epoxy printed circuit board. Optocoupler isolation chips, signal conditioning components. Reinforced plastic module housing. Screw‑type field wiring terminals. Copper‑alloy back‑plane plug‑in contact pieces.
Structural Characteristics Standard rack‑mount plug‑in module structure. Front panel arranges LED indicators for each input channel. Rear side connects rack back‑plane bus. Module width 25 mm, height 130 mm, depth 120 mm. Weight approximately 0.41 kilogram.
Working Principle After power‑on, module completes hardware self‑check. External field digital signal passes optocoupler isolation circuit and converts into internal logic signal.
Installation Requirements Insert module into designated rack slot and lock fastening screw. Connect 24 V DC auxiliary power supply. Complete field signal wiring in accordance with engineering drawing. Guarantee cabinet protective grounding. Check channel LED status after power‑on.
Usage Notes Wear anti‑static wrist strap during handling. Hot‑swap under powered condition is forbidden. Prevent over‑voltage surge entering signal channels. Periodically check terminal tightening torque. Keep module away from dust and corrosive gas environment.
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