AI845-eA Analog Input Module  

1. Key Parameters

• Number of Input Channels: 4 independent, galvanically isolated channels
• Supported Signal Types:
  • Current signals: 4-20mA DC, 0-20mA DC (two-wire/three-wire transmitter compatible)
  • Voltage signals: 0-10V DC, ±10V DC, 0-5V DC, ±5V DC
  • RTD signals: Pt100, Pt1000 (3-wire/4-wire connection), Ni100, Ni1000
  • Thermocouple signals: K-type, J-type, T-type, E-type, R-type, S-type (with 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: ±0.3℃ (for K-type, 0℃~+1000℃)
• Resolution: 24 bits (for all signal types)
• Sampling Rate: 50 samples/second per channel (configurable up to 100 samples/second)
• Temperature Drift: ≤20ppm/℃ (for current/voltage); ≤30ppm/℃ (for RTD); ≤50ppm/℃ (for thermocouple)
• Isolation Level: 3kVrms (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/short-circuit detection
• Power Supply: 24V DC (±10% tolerance); Typical power consumption: ≤6W (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
• Protection Class: IP20 (module body); Complies with IEC 61010-1 (safety) and IEC 61000-6-2 (EMC immunity)

2. Product Features

• Broad Signal Compatibility: Supports current, voltage, RTD, and thermocouple signals in a single module, eliminating the need for multiple dedicated modules and simplifying system integration.
• Ultra-High Precision: Equipped with a 24-bit high-performance ADC and advanced signal conditioning circuits, ensuring exceptional measurement accuracy and low temperature drift—critical for demanding process control applications.
• Enhanced Isolation: 3kVrms galvanic isolation between channels prevents ground loops and cross-interference, ensuring reliable operation in electrically noisy industrial environments.
• Flexible Configuration: Each channel can be independently configured for signal type, range, and sampling rate via the 800xA Engineering Studio, with no hardware modifications required.
• Advanced Diagnostics: Integrated open-circuit/short-circuit detection for sensors, along with front-panel LEDs (per-channel status + module power/communication), enables quick fault identification and troubleshooting.
• Fast Sampling: Up to 100 samples/second per channel allows capture of rapid signal variations in dynamic processes.
• Industrial Durability: Flame-retardant ABS housing (UL94 V-0) and anti-vibration design (IEC 60068-2-6) ensure stable performance in harsh industrial environments.

3. Application Fields

• Process Industry: Precise measurement of temperature, pressure, flow, and level in chemical plants, oil refineries, and petrochemical facilities.
• Power Generation: Monitoring of steam temperature, pressure, and turbine vibration in thermal power plants and renewable energy systems.
• Manufacturing: Measurement of mold temperature, hydraulic pressure, and material thickness in automotive and semiconductor production lines.
• Pharmaceutical & Food Processing: Accurate temperature and pressure monitoring in sterile production environments, complying with GMP standards.
• Aerospace & Defense: Precise measurement of critical parameters in test facilities and industrial machinery.

4. Precautions

• Signal Compatibility: Ensure the connected sensor/transmitter signal type matches the channel configuration to avoid measurement errors.
• Wiring Requirements: Use shielded twisted-pair cables for signal lines, with proper grounding to minimize electromagnetic interference.
• Thermocouple Handling: Use appropriate compensation cables for thermocouples to ensure accurate temperature measurement.
• Power Supply: Maintain input voltage within 24V DC ±10% to prevent damage to internal components.
• Environmental Limits: Avoid installation near strong magnetic fields or heat sources exceeding 60℃.
• Calibration: Perform annual calibration using standard signal generators to maintain measurement accuracy, especially in critical applications

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