ABB|CAI20| Analog Input Module

ABB CAI 20 Analog Input Module

Description
ABB CAI 20 is a high-density analog input module for process signal acquisition in industrial automation systems.

Features

• Supports up to 32 analog inputs or 16 with binary release signals
• Compatible with 2-wire and 4-wire transmitters (4–20 mA), HART protocol
• Provides voltage measurement (0–10 V) and digital communication
• Includes overload/short-circuit protection and electrical isolation
• Designed for redundant operation and real-time monitoring

Technical Specifications

• Analog Inputs

  • Max. 32 channels for 2-wire transmitters (4–20 mA) with isolated supply
  • Max. 32 channels for voltages (0–10 V)
  • Measuring range: 0–22.5 mA / 0–11.5 V
  • A/D conversion: 12-bit, linearity error ≤6 µA / ≤3 mV
  • Zero error ≤12 µA / ≤6 mV; amplification error ≤0.1%

• Transmitter Supply

  • Output voltage ≥23 V
  • Rated current 25 mA; short-circuit current 38 mA

• Binary Inputs

  • L signal: –3 to +5 V
  • H signal: +12 to 35 V
  • Input current ~0.75 mA

• HART Communication

  • Supported versions: 5.0 / 5.1
  • Minimum current: 3 mA

• Signal Processing

  • Low-pass damping: T = 100 ms, –30 dB at 50 Hz
  • Update time <40 ms

• Electrical Isolation

  • Group-wise isolation
  • Rating voltage: 50 Veff
  • Test voltage: 500 Veff

• Power Supply

  • Voltage: 20–33 V DC
  • Current consumption: 195 mA (standby), 865 mA (active)
  • Max. power loss: 11 W at 24 V DC