AI835A-eA Analog Input Module  

1. Key Parameters

• Number of Input Channels: 8 independent, isolated channels (channel-to-channel galvanic isolation)
• Supported Signal Types:
  • Current signals: 4-20mA DC, 0-20mA DC (two-wire/three-wire transmitter compatible)
  • Voltage signals: ±10V DC, 0-10V DC, 0-5V DC
  • RTD signals: Pt100, Pt1000 (3-wire/4-wire connection for high accuracy)
  • Thermocouple signals: K-type, J-type, T-type, E-type (built-in cold junction compensation)
• Measurement Accuracy:
  • Current/voltage: ±0.05% of full scale (at 25℃); ±0.1% of full scale (within operating temperature range)
  • RTD: ±0.1℃ (for Pt100, -50℃~+200℃); Thermocouple: ±0.5℃ (for K-type, 0℃~+1000℃)
• Resolution: 24 bits (for RTD/thermocouple); 16 bits (for current/voltage)
• Sampling Rate: 20 samples/second per channel (configurable up to 100 samples/second for fast-response scenarios)
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤8W (full load)
• Operating Temperature Range: -20℃~+60℃
• Storage Temperature Range: -40℃~+85℃
• Isolation Level: 3kVrms (channel-to-channel, channel-to-power supply, channel-to-backplane)
• Communication Interface: Compatible with Modbus RTU and Profinet (for seamless integration with 800xA system)
• Installation Method: 35mm standard DIN rail mounting
• Protection Class: IP20 (module body); Complies with IEC 61010-1 (safety) and IEC 61000-6-2 (EMC immunity)

2. Product Features

• Multi-Signal Compatibility: Supports current, voltage, RTD, and thermocouple signals in one module, eliminating the need for multiple dedicated modules and saving cabinet space.
• Ultra-High Measurement Precision: Equipped with a 24-bit high-performance ADC (Analog-to-Digital Converter) and built-in signal conditioning circuits, ensuring low temperature drift (≤20ppm/℃ for current/voltage; ≤30ppm/℃ for RTD) and minimal noise interference.
• Enhanced Isolation & Anti-Interference: 3kVrms galvanic isolation prevents ground loops and cross-channel interference; integrated EMI/RFI filters (compliant with EN 61000-4-6) resist industrial electrical noise.
• Intelligent Fault Detection: Provides real-time detection of open circuits (for RTD/thermocouple), short circuits (for current/voltage), and over-range signals; triggers visual alarms via LED indicators for quick troubleshooting.
• Flexible Software Configuration: Each channel can be independently configured for signal type, range, and sampling rate via the 800xA engineering tool (no hardware jumpers required), adapting to diverse application needs.
• Industrial Durability: Adopts flame-retardant ABS housing (UL94 V-0) and anti-vibration design (IEC 60068-2-6: 50Hz, 10g acceleration), ensuring stable operation in dusty, humid, or vibration-prone industrial environments.

3. Application Fields

• Process Industry: Monitoring of temperature (reactors), pressure (pipes), and flow (media) in chemical plants, oil refineries, and petrochemical facilities.
• Power Sector: Acquisition of steam temperature (boilers), coolant pressure (turbines), and current/voltage (power distribution cabinets) in thermal power plants and renewable energy systems.
• Manufacturing Automation: Measurement of mold temperature (injection molding machines), hydraulic pressure (presses), and air flow (HVAC for clean rooms) in automotive and semiconductor factories.
• Water & Wastewater Treatment: Monitoring of pH value (neutralization tanks), dissolved oxygen (aeration tanks), and water flow (pumping stations) via compatible transmitters.
• Pharmaceutical & Food Industry: Precise temperature monitoring of fermentation tanks (pharmaceuticals) and baking ovens (food processing), complying with GMP requirements for data accuracy and traceability.

4. Precautions

• Before installation, confirm the module model (AI835A-eA) and signal type compatibility with connected sensors/transmitters to avoid measurement errors.
• For RTD/thermocouple connections, use dedicated compensation cables (for thermocouples) and ensure consistent wire resistance (for RTDs) to minimize accuracy loss.
• Route signal cables separately from high-voltage power cables (≥30cm spacing) and use shielded twisted-pair cables; connect the cable shield to the system’s protective ground (single-point grounding) to reduce EMI.
• When performing hot-swap replacement, ensure the 800xA system supports online module replacement; otherwise, power off the S800 I/O rack first to prevent transient current damage.
• Calibrate the module annually (per ABB’s recommended maintenance cycle) using a standard signal generator to maintain measurement accuracy, especially in critical process control scenarios

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