Technical Specifications Rack back‑plane bus connector, multi‑channel field signal screw‑type terminals, built‑in isolation circuit, module locking structure. Operating power supplied by rack back‑plane. Operating temperature 0 ℃ to +60 ℃, storage temperature ‑40 ℃ to +85 ℃, non‑condensing relative humidity 5%‑95%.
Functional Features Provides installation base for compatible I/O module. Realizes galvanic isolation between field signal circuit and I/O module circuit. Completes signal transition between field screw terminals and I/O module. Supports module replacement without removing field wiring.
Application Scenarios Spare isolated terminal base for ABB DCS I/O module. Applied in field signal with serious ground‑loop interference.
Performance Parameters Stable isolated signal transmission performance. High isolation‑voltage withstand capability. Reliable mechanical locking characteristic.
Material Composition Flame‑retardant plastic base housing. Multilayer glass‑fiber epoxy printed circuit board with isolation assembly. Rack back‑plane plug‑in connector, field signal screw terminals and module locking mechanical parts.
Structural Characteristics Standard rack plug‑in base structure. Rear connector connects to rack back‑plane bus. Front panel arranges multi‑group field signal screw wiring terminals. Upper‑part clamping structure for I/O module installation. Metal locking screw for rack slot fixing.
Working Principle TU842 is inserted into control rack slot and connects to back‑plane bus. Field signal enters base screw terminals, passes through built‑in isolation circuit and transmits to I/O module. Isolation assembly cuts off ground‑loop interference path between field side and control‑system side.
Installation Requirements Disconnect rack power supply before replacement. Insert TU842 into target rack slot and fasten fixing screw. Install compatible I/O module and lock. Connect field signal cable to front‑panel terminals. Restore rack power supply, verify signal transmission and anti‑interference effect.
Usage Notes Select matched I/O module. Hot‑swap of base under powered condition is prohibited. Isolation voltage rating shall match site environment requirement.
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