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ABB AI820 Analog Input Module  

Product Overview

The ABB AI820 is a high-performance differential analog input module designed for industrial automation applications. It features 4 differential bipolar input channels that can be independently configured for current or voltage input, providing exceptional measurement accuracy and noise immunity in harsh industrial environments .

Technical Specifications

General Parameters

• Brand: ABB

• Model: AI820

• Type: Differential analog input module

• Channels: 4 isolated differential inputs

• Resolution: 14-bit + sign

• Isolation Voltage: 500V AC (test voltage) 

Electrical Characteristics

• Input Types:

  • Current: -20...+20 mA, 0...20 mA, 4...20 mA

  • Voltage: -10...+10 V, 0...10 V, 2...10 V, -5...+5 V, 0...5 V, 1...5 V DC 

• Input Impedance:

  • Voltage: 200kΩ ±25%

  • Current: 250Ω

• Max Cable Length: 600m (656 yards)

• CMRR: 80 dB (>60 dB DC)

• NMRR: 33 dB (50/60 Hz)

• Accuracy: ±0.1% of range 

Performance

• Update Rate: <26ms for all 4 channels

• Temperature Drift:

  • Current: 50 ppm/°C max

  • Voltage: 70 ppm/°C max 

• Input Filter: 40ms rise time

• Power Consumption:

  • 24V bus: 70mA

  • 5V bus: 80mA

  • Total dissipation: 1.7W 

Physical Characteristics

• Dimensions: 102×119×45mm (W×H×D)

• Weight: 0.3kg

• Mounting: Compatible with ABB S800 I/O system 

Key Features

1. Differential Input Design: Provides superior noise rejection compared to single-ended inputs, making it ideal for electrically noisy environments .

2. Flexible Configuration: Each channel can be independently configured as current or voltage input, supporting multiple signal types simultaneously .

3. High Resolution: 14-bit + sign resolution (16,384 steps) ensures precise measurement of process variables .

4. Robust Protection:

   • Withstands accidental 30V DC connections on current inputs

   • 250Ω current sensing resistor rated for ~5W temporary protection 

5. HART Compatibility: Input terminals can carry HART communication signals for smart transmitter integration .

6. Module Terminal Unit (MTU) Support: Works with TU810, TU812, TU814 or TU830 MTUs for flexible field connections .

7. Excellent Isolation: All 4 channels are isolated from module bus (50V rated insulation voltage) .

Application Fields

1. Process Industries: Precise measurement of temperature, pressure, and flow variables in oil refineries and chemical plants .

2. Power Generation: Monitoring critical parameters in turbines, generators and substations .

3. Water Treatment: Accurate level and flow measurement in filtration and pumping systems .

4. Manufacturing: Process monitoring in automotive, pharmaceutical and food production lines .

5. HVAC Systems: Environmental parameter monitoring in large commercial buildings .

Installation and Operation Notes

Wiring Guidelines

• Use shielded twisted-pair cables for analog signals

• Maintain proper separation from power cables (>20cm)

• Implement single-point grounding for shields 

Environmental Considerations

• Operating temperature: 0°C to +60°C (extended -20°C to +60°C in some sources) 

• Relative humidity: <75% non-condensing

• Avoid installation in areas with excessive vibration 

Maintenance

• Regularly check terminal connections for tightness

• Monitor module status indicators

• Keep ventilation paths clear 

System Integration

The AI820 module is part of ABB's S800 I/O system and is designed to work seamlessly with:

• AC800M controllers

• Various Module Terminal Units (TU810, TU812, TU814, TU830)

• ABB's industrial communication networks 

For optimal performance, the module should be properly configured using ABB's engineering tools to match the specific application requirements, including:

• Input type selection (current/voltage)

• Measurement range

• Filter settings

• Alarm thresholds 

The structure and details of the product：

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