Technical Specifications Rack back‑plane bus connector, high‑density multi‑channel screw‑type field terminals, module locking mechanism. 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 fixed mounting base for high‑density I/O modules. Establishes electrical connection between I/O module and rack back‑plane bus. Supplies large‑quantity screw terminals for multi‑point field signal wiring. Allows upper I/O module replacement without disconnecting field cables. Supports system self‑diagnosis for contact state.
Application Scenarios Spare terminal base for ABB DCS control rack. Deployed in compact control cabinets with abundant I/O measuring and control points for process industries.
Performance Parameters Stable multi‑channel signal transmission performance. Reliable mechanical locking and contact performance. High wiring density for limited cabinet space.
Material Composition Flame‑retardant plastic housing. Multilayer glass‑fiber epoxy printed circuit board. Rack back‑plane plug‑in connector, dense screw terminals and metal locking mechanical assemblies.
Structural Characteristics Standard rack plug‑in base structure. Rear connector interfaces with rack back‑plane bus. Front panel arranges dense multi‑group screw‑wiring terminals. Upper clamping structure holds matching I/O module. Metal locking screw secures base inside rack slot.
Working Principle TU847 is inserted into rack slot and couples to back‑plane bus. Field signals are fed into front‑panel screw terminals. Internal PCB conducts bidirectional signal transmission between field side and installed I/O module, further exchanging data with controller CPU via back‑plane bus.
Installation Requirements Mount compatible high‑density I/O module and lock firmly. Terminate field signal cables onto front‑panel screw terminals. Restore rack power supply and verify each signal channel status.
Usage Notes Only use compatible matched I/O modules. Hot‑swap of base under powered condition is prohibited. Arrange field cables properly to prevent short‑circuit between adjacent terminals. Keep terminal screws tightened to specified torque.
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