ABB AI625 analog input module

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ABB AI625 Analog Input Module Technical Documentation

Product Description

The ABB AI625 is a 16-channel analog input module designed for PLC and industrial automation systems. It converts field sensor signals (e.g., temperature, pressure) into high-precision digital data via 12-bit resolution A/D conversion. Supporting RS-485 communication and MODBUS RTU protocol, it enables distributed data acquisition in harsh industrial environments (-25°C to +70°C) .

Detailed Technical Parameters

Key Features & Advantages

1. High-Speed Precision

   • 12-bit resolution and 2 μs conversion time ensure accurate real-time signal acquisition for dynamic control systems .

2. Multi-Module Scalability

   • RS-485 interface allows daisy-chaining multiple modules (address-coding support), expanding input capacity for large-scale systems .

3. Industrial Robustness

   • DIN rail design with wide temperature tolerance (-25°C to +70°C), suitable for vibration-prone environments like manufacturing plants .

4. Seamless Integration

   • Native MODBUS RTU compatibility enables direct connection to SCADA, PLCs (e.g., ABB AC500), and HMI software without additional converters .

5. Low Maintenance Design

   • Self-diagnostic circuits detect channel faults (e.g., open wire), reducing downtime in critical processes .

Application Fields

1. Process Automation

   • Temperature/pressure monitoring in chemical reactors, flow rate control in pipelines .

2. Energy Management

   • Grid voltage/current acquisition in substations, renewable energy system analytics .

3. Manufacturing Control

   • CNC machine tool feedback, robotic arm position sensing .

4. Building Management Systems (BMS)

   • HVAC load monitoring, chiller plant optimization .

5. Environmental Monitoring

   • Wastewater pH measurement, emission gas analysis in scrubbers .

Critical Precautions

1. Wiring & Grounding

   • Use shielded twisted-pair cables for analog signals; separate from power lines ≥20 cm to prevent EMI interference. Ensure single-point grounding in noisy environments .

2. Environmental Limits

   • Avoid installation near heat sources (>50°C) or conductive dust. Maintain humidity <95% non-condensing 1.

3. Configuration Rules

   • Set unique MODBUS addresses (1–247) for each module in multi-device networks; verify baud rate parity with host controller .

4. Voltage Protection

   • Add surge suppressors for field inputs exposed to lightning risks (e.g., outdoor sensors). Never exceed ±15 V input to avoid ADC damage .

5. Maintenance Protocol

   • Calibrate zero/span annually using precision voltage sources; inspect terminal blocks for corrosion quarterly.

The structure and details of the product：

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