ABB NRDI-01 Input Terminal Unit

1. Product Overview

• Model / Identifier: NRDI‑01

• Type: Input Terminal Unit / Digital Input Module

• Purpose: Converts field digital signals (e.g., switches, sensors, limit switches) into signals recognizable by ABB control systems (DCS / PLC / I/O architectures).

• Mounting Method: Rail-mounted module

• Function: Provides isolated digital input interface for control systems.

2. Technical Specifications

3. Features and Advantages

1. Digital Input Interface
   Supports acquisition of switch signals for control and logic processing.

2. Isolated Design
   Ensures interference immunity and reliable system operation.

3. Modular and Rail-Mounted
   Easy installation, maintenance, and replacement.

4. Industrial Environment Suitability
   Wide operating temperature range and durable design for field use.

5. High Compatibility
   Works seamlessly with ABB DCS systems and PLC I/O architectures.

4. Typical Applications

• Digital input layer for ABB DCS / PLC systems

• Switch signal acquisition in industrial automation

• Sensor input interface in process control

• Power, chemical, metallurgy, water treatment, and other industrial control systems

• Compatible with ABB I/O architectures (Bailey Infi 90 / Net 90)

5. Installation and Safety Notes

1. Input Signal Matching

   • Ensure input voltage and type match module specifications (24 V DC dry contacts or switch signals).

2. Environmental Conditions

   • Operate within –20 °C to +60 °C; avoid moisture, excessive heat, and vibration.

3. Wiring Requirements

   • Use properly rated cables and terminals for reliable connections.

   • Avoid long wiring runs to prevent signal attenuation or interference.

4. Mounting and Stability

   • Secure rail mounting to prevent vibration or loosening.

5. Maintenance

   • Periodically inspect wiring, terminal tightness, and module surface condition.

   • Keep the module free from dust and debris.

6. System Safety

   • Ensure the input terminal module operates within control system logic and isolation mechanisms for safe and reliable operation.

The structure and details of the product：

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