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ABB TU840 Modular Termination Unit (Concise Version)

I. Product Positioning

II. Core Specifications

III. Core Functions

1. Signal Connection & Protection: Field cables connect to front terminals, and prefabricated link cables connect to I/O modules—avoiding damage to modules caused by direct wiring.
2. Quick Maintenance: Supports hot-swapping; I/O modules can be replaced without removing field cables. Each channel has a test point for easy signal measurement.
3. Error-Prevention Design: Clear terminal numbering and color-coded analog/digital signals reduce wiring errors.

IV. Typical Applications

• Signal termination for analog sensors (e.g., pressure, temperature) and digital devices (e.g., valves, switches) in industrial control cabinets.
• Serves as an interface between the AC 800M system and field devices to simplify wiring and improve maintenance efficiency.

V. Usage Notes

1. Conductor Size Limit: 0.2-2.5mm²; tool-free crimping for 0.2-1.5mm² wires.
2. Use 4mm insulated test probes during testing to avoid short-circuiting adjacent channels.
3. Must be used with ABB original link cables to ensure signal integrity

The structure and details of the product：

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