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ABB 3BSE0690521 DI818 Digital Input Module 

1. Key Parameters

• Product Model: DI818
• Order Code: 3BSE0690521
• Product Series: ABB 800xA I/O Series (DCS Digital Input Modules)
• Core Function: 16-channel digital input; PNP/NPN selectable; DIN rail mounting; galvanic isolation; compatible with ABB 800xA DCS.

2. Core Features

• 16-Channel Collection: Supports simultaneous signal acquisition from 16 field devices, reducing module quantity in dense control loops.
• Dual Input Compatibility: Software-selectable PNP/NPN adapts to diverse sensor types, eliminating the need for separate modules.
• High Isolation: 2.5kVrms galvanic isolation prevents cross-interference between channels and protects the DCS from voltage surges.
• 800xA Integration: Plug-and-play with ABB 800xA DCS—auto-detected by the system, cutting setup time.

3. Application Fields

• Process Control: Acquires status signals from valve limit switches, pump run/stop indicators in chemical/petrochemical plants.
• Manufacturing: Reads photoelectric sensor signals (part presence) and conveyor limit switches in automotive assembly lines.
• Utilities: Monitors switchgear status and water tank level sensors in power plants or municipal water treatment systems.

4. Precautions

• Compatibility: Use exclusively with ABB 800xA DCS; avoid mismatched input voltage (must be 24V DC).
• Installation: Separate input wiring from high-power cables (>10A) to reduce EMI; torque terminal screws to 0.5~0.7 N·m.
• Maintenance: Test channel responsiveness quarterly; clean terminals monthly (remove dust); replace if isolation fails or channels are unresponsive.
• Spare Parts: Use genuine ABB 3BSE0690521 DI818 units—non-genuine modules may cause signal loss or DCS interference.

The structure and details of the product：

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