AI820-eA 4-Channel Analog Input Module  

1. Key Parameters

• Number of Input Channels: 4 independent, galvanically isolated channels
• Supported Signal Types:
  • Current signals: 4-20mA DC (two-wire/three-wire transmitter compatible), 0-20mA DC
  • Voltage signals: 0-10V DC, ±10V DC, 0-5V DC
  • RTD signals: Pt100 (3-wire connection), Pt1000 (3-wire connection, optional)
• Measurement Accuracy:
  • Current/voltage: ±0.1% of full scale (at 25℃); ±0.2% of full scale (within operating temperature range)
  • RTD (Pt100): ±0.2℃ (for -50℃~+200℃); ±0.5℃ (for -200℃~+600℃, optional)
• Resolution: 16 bits (for current/voltage); 20 bits (for RTD)
• Sampling Rate: 10 samples/second per channel (configurable up to 50 samples/second for fast-response needs)
• Temperature Drift: ≤50ppm/℃ (for current/voltage); ≤80ppm/℃ (for RTD)
• Isolation Level: 2.5kVrms (channel-to-channel, channel-to-power supply, channel-to-backplane)
• Protection Features: 2kV ESD protection (IEC 61000-4-2), 4kV EFT protection (IEC 61000-4-4), open-circuit detection (for RTD)
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤5W (full load)
• Operating Temperature Range: -20℃~+60℃
• Storage Temperature Range: -40℃~+85℃
• Communication Interface: Profinet (for 800xA system integration), Modbus RTU (for third-party PLC compatibility)
• Installation Method: 35mm standard DIN rail mounting (compact design fits narrow control cabinets)
• Protection Class: IP20 (module body); Complies with IEC 61010-1 (safety) and IEC 61000-6-2 (EMC immunity)

2. Product Features

• Compact & Space-Saving: 4-channel design with a slim profile optimizes use of control cabinet space, ideal for applications with limited installation area (e.g., small-scale process skids, distributed I/O stations).
• Multi-Signal Versatility: Supports current, voltage, and RTD signals in one module, eliminating the need for multiple dedicated modules and simplifying system wiring.
• Reliable Isolation: 2.5kVrms galvanic isolation between channels prevents ground loops and cross-interference, ensuring stable measurement in noisy industrial environments (e.g., near motors, frequency converters).
• Easy Configuration: Each channel can be independently set for signal type, range, and sampling rate via the 800xA Engineering Studio—no hardware jumpers required, reducing on-site commissioning time.
• Intuitive Diagnostics: Front-panel LED indicators (per-channel signal status, module power, communication) provide real-time visual feedback; open-circuit detection for RTDs enables quick troubleshooting of sensor wiring faults.
• Industrial Durability: Adopts flame-retardant ABS housing (UL94 V-0) and anti-vibration design (IEC 60068-2-6: 50Hz, 5g acceleration), withstanding dusty, humid, or vibration-prone conditions (e.g., packaging machines, small-scale manufacturing lines).
• Seamless System Integration: Optimized for ABB 800xA and S800 I/O, supporting online parameter adjustment and data logging—facilitates integration with central control systems and simplifies maintenance.

3. Application Fields

• Small-Scale Process Control: Acquisition of pressure (pipes), temperature (small reactors), and flow (media) signals in mini chemical plants, food processing lines, and laboratory-scale production systems.
• Manufacturing Equipment: Measurement of mold temperature (injection molding machines), hydraulic pressure (small presses), and motor bearing temperature (conveyor systems) in automotive component workshops.
• Building Automation: Monitoring of HVAC system air temperature, water pressure, and CO₂ concentration in commercial buildings, data centers, and clean rooms.
• Water & Wastewater Treatment: Acquisition of pH value (small neutralization tanks), dissolved oxygen (local aeration units), and pump outlet pressure in decentralized treatment facilities.
• Energy Monitoring: Measurement of current/voltage (small-scale solar inverters), transformer temperature, and power distribution cabinet humidity in residential or small commercial energy systems.

4. Precautions

• Signal Compatibility Check: Before installation, confirm the connected sensor/transmitter signal type (e.g., 4-20mA, Pt100) matches the channel configuration to avoid measurement errors.
• RTD Wiring Requirements: For Pt100/Pt1000 connections, use wires of the same gauge and length (≤100m) to minimize resistance imbalance and ensure measurement accuracy.
• Wiring Best Practices: Use shielded twisted-pair cables for signal lines; route them separately from high-voltage power cables (≥20cm spacing) and connect the cable shield to protective ground (single-point grounding) to reduce EMI.
• Power Supply Safety: Ensure the input power is 24V DC (±10%)—overvoltage or reverse polarity will damage the module’s internal circuit.
• Environmental Limits: Do not install in areas with temperatures exceeding 60℃ or high corrosive gas concentrations (e.g., coastal salt spray, chemical fumes) without additional protection.
• Calibration Schedule: Calibrate the module annually (per ABB recommendations) using a standard signal generator to maintain measurement accuracy, especially for critical parameters (e.g., food processing temperature).

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