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ABB TU812 Compact Modular Termination Unit

1. Product Overview

2. Core Specifications

3. Key Functions

3.1 Space-Optimized, Low-Density Termination

• 24 Channels in 60mm Width: 12 dual-channel terminals balance density and compactness—fits in 60mm-wide slots (e.g., machine control boxes for packaging lines) where larger units (e.g., TU810, TU840) are too bulky.
• Tool-Free Miniature Terminals: Accepts 0.14–1.5mm² small-gauge wires (common for sensors/miniature actuators) without tools, cutting installation time by 30% vs. screw-terminal units.

3.2 Signal Protection & Integrity

• Electrical Isolation: Prevents cross-talk between low-level analog signals (e.g., 4-20mA from pH sensors) and digital signals (e.g., 24V DC limit switch commands), ensuring ±0.1% measurement accuracy—critical for pharmaceutical or food process control.
• Mechanical Shielding: Shields delicate S800 I/O module terminals from accidental damage (e.g., screwdriver slips during wiring), reducing repair costs for high-precision I/O modules.

3.3 Simplified Maintenance

• Integrated Micro Test Points: Each channel has a 2mm-compatible test port—technicians can verify signal values (e.g., 8mA from a flow sensor) without disconnecting wires, slashing troubleshooting time.
• Plug-and-Play Link Cables: Uses ABB prefabricated link cables (e.g., 3HAC031682-002) to connect to S800 I/O modules. Replacing a faulty I/O module takes <3 minutes (no field wire disconnection).

4. Typical Applications

• Food Packaging Machines: Terminates 24 signals (12 AI: temperature/film tension; 12 DI: door interlocks/photoeyes) in machine-mounted compact cabinets.
• Pharmaceutical Batch Skids: Connects 4-20mA pressure sensors (10 channels) and 24V DC valve actuators (14 channels) to S800 I/O modules in cleanroom-compatible narrow cabinets.
• Distributed Water Sensors: Supports 24 low-power sensor signals (e.g., level sensors in small water tanks) at remote I/O stations with limited space.

5. Usage Notes

1. Wire Compatibility: Use 0.14–1.5mm² stranded copper wires—solid wires or larger gauges will damage the miniature spring clamps.
2. Test Probe Safety: Use 2mm insulated test probes (ABB-approved) to avoid short-circuiting adjacent compact terminals (risk of signal loss or module damage).
3. Link Cable Authenticity: Only use ABB original link cables (e.g., 3HAC031682-002)—third-party cables may have incorrect pinouts, causing communication failures.
4. Clearance Requirement: Maintain ≥15mm clearance around the unit for airflow in enclosed machine cabinets (prevents overheating in high-temperature environments like bakery lines)

The structure and details of the product：

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