Description
ABB AI625 is a high-precision analog input module from the ABB S800 I/O series, designed for accurate signal acquisition and conversion in industrial process control systems. ABB AI625 supports 8 configurable channels (single-ended or differential via DIP switch) and is compatible with standard industrial signals such as 4-20mA current, 0-10V voltage, and Pt100/Cu50 thermocouples, meeting diverse measurement needs. ABB AI625 features a 16-bit Δ-Σ ADC converter with a 10kHz per-channel conversion rate, delivering exceptional measurement accuracy of ±0.05% FS and minimal temperature drift of ±0.001% FS/℃. ABB AI625 integrates 2500V AC channel isolation and 6kV surge protection, ensuring signal integrity in high-EMI industrial environments without the need for external safety barriers. ABB AI625 communicates via PROFINET or Modbus RTU, enabling seamless integration with ABB AC800M controllers and third-party PLCs like Siemens S7-1200. ABB AI625 includes built-in wire break detection and configurable over-range alarms, providing real-time fault feedback for critical process monitoring.
Technical Parameters ABB AI625
| Parameter | Value |
|---|---|
| Product Model | ABB AI625 (S800 I/O Series Analog Input Module) |
| Channel Configuration | 8 single-ended / 4 differential (configurable via DIP switch) |
| Supported Signals | Current: 4-20mA, 0-20mA (input impedance 250Ω); Voltage: 0-10V, ±5V (input impedance ≥10MΩ); Thermocouple: Pt100 (3-wire), Cu50 |
| Measurement Range | Current: 0-20mA; Voltage: -10V~+10V; Pt100: -200℃~600℃ |
| Precision | Basic error: ±0.05% FS (25℃); Temperature drift: ±0.001% FS/℃ (-10~50℃) |
| Resolution | 16-bit (minimum measurable 0.0015% FS) |
| Conversion Rate | 10kHz per channel |
| Isolation & Protection | 2500V AC channel isolation; 6kV contact discharge surge protection |
| Communication Protocols | PROFINET, Modbus RTU |
| Data Update Rate | 50ms |
| Power Supply | 24V DC |
| Operating Temperature | -20°C to +55°C |
| Protection Rating | IP20 |
| Dimensions | 252mm × 273mm × 40mm |
| Weight | Approx. 0.8kg |
| Certifications | CE, RoHS |
Advantages and Features ABB AI625
- Superior Measurement Accuracy: ABB AI625’s 16-bit ADC and low temperature drift ensure reliable, high-precision data acquisition for critical process control.
- Flexible Signal Compatibility: Supports multiple signal types (current/voltage/thermocouple) and configurable channels, adapting to diverse industrial measurement scenarios.
- Robust Anti-Interference Design: Channel isolation and surge protection maintain signal integrity in high-EMI environments, reducing measurement errors.
- Seamless System Integration: Compatible with ABB controllers and third-party PLCs via standard protocols, enabling easy integration into existing automation systems.
- Built-in Fault Detection: Wire break detection and over-range alarms provide real-time fault feedback, enhancing process safety and reducing troubleshooting time.
Application Cases
- Chemical Industry: A petrochemical plant used ABB AI625 to monitor reactor temperature and pressure, collecting 8-channel Pt100 and 4-20mA signals. Its ±0.05% FS accuracy ensured stable reaction conditions, cutting product quality deviations by 22%.
- Power Generation: A thermal power plant integrated ABB AI625 into its boiler control system, acquiring steam pressure and flow signals. 2500V AC isolation withstood electromagnetic interference from generators, improving data reliability by 30%.
- Food & Beverage: A beverage production line deployed ABB AI625 to measure mixing tank temperature and viscosity. Configurable channels and fast conversion rate supported real-time PID control, ensuring consistent product taste with a temperature deviation of ≤±0.2℃.
Comparison with Competitors
| Parameter | ABB AI625 | Siemens SM 331 (6ES7331-7NF10-0AB0) | Emerson 1756-IF8H |
|---|---|---|---|
| Channel Count | 8 (configurable) | 8 (fixed differential) | 8 |
| Measurement Precision | ±0.05% FS | ±0.1% FS | ±0.075% FS |
| Isolation | 2500V AC (channel-level) | 500V AC (system-level) | 1500V AC (channel-level) |
| Supported Signals | Current/voltage/thermocouple | Current/voltage | Current/voltage/thermocouple |
| Communication | PROFINET/Modbus RTU | Profibus/Profinet | Ethernet/IP |
| Key Advantage | High precision, strong anti-interference | Siemens PLC native integration | Fast data update rate |
Selection Recommendations
- Choose ABB AI625 for industrial processes requiring high-precision measurement (±0.05% FS) of temperature, pressure, or flow signals.
- Prefer ABB AI625 in high-EMI environments (e.g., power plants, factories) where channel isolation and surge protection are critical.
- Use ABB AI625 for systems integrating ABB AC800M controllers or third-party PLCs, as its multi-protocol support ensures seamless connectivity.
- Opt for ABB AI625 in applications needing flexible signal input (mixed current/voltage/thermocouple) to avoid multiple dedicated modules.
Precautions
- Match the field device’s signal type with ABB AI625’s configured input type to prevent signal incompatibility and measurement errors.
- Ensure proper grounding and use shielded cables during installation to maximize the module’s anti-interference performance.
- Configure the correct measurement range via software to fully utilize ABB AI625’s precision and avoid over-range issues.
- Calibrate the module regularly (annually recommended) to maintain its ±0.05% FS accuracy, especially in harsh operating environments.
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