ABB CAI20 Symphony 32-Channel Analog Input Module

Product Description

The ABB CAI20 (Part Number P72122-4-0788722 / Order Code 3BDH000722R1) is a high-density, high-performance Analog Input Module belonging to the legacy ABB Symphony and Symphony Plus distributed control system (DCS) families. 

Technical Specifications

• Manufacturer: ABB

• Product Series Platform: Symphony / Symphony Plus Distributed Control System (DCS)

• Model Designation: CAI20 (Also referred to as CAI 20-P)

• Factory Part Numbers: P72122-4-0788722 / 3BDH000722R1

• Device Classification: High-Density Analog Input (AI) Processing Card

• Maximum Channel Footprint:

• Up to 32 channels for 2-wire transmitters (4 to 20 mA) with built-in short-circuit proof transmitter supply

• Up to 32 channels for 4-wire transmitters (0/4 to 20 mA) without binary release signals

• Up to 32 channels for voltage loops (0 to 10 V)

• Up to 16 channels for 4-wire transmitters featuring binary release indicators

• Smart Device Interfacing: Supports digital communication with up to 32 Contrac actuators or HART-enabled field instruments (HART v5.0 / v5.1)

• Internal Resolution: 12-bit analog-to-digital (A/D) conversion layout

• Input Impedance Parameter: 250$\Omega$ nominal internal measuring resistance

• Channel Group Isolation: Common galvanic electrical isolation to Symphony system bus structures

• Hardware Filtering Engine: Onboard low-pass input filter damping;$T = 100\text{ ms}$ (Provides -30 dB rejection at 50 Hz)

• Measurement Refresh Rate: Update cycle time$< 40\text{ ms}$ (typical)

• System Fault Monitoring: Built-in open circuit (wire break) and loop short-circuit detection routines

• Operational Supply Voltage: 20 VDC to 33 VDC (24 VDC Nominal input rail)

• Power Consumption Profile: 195 mA at 24 V (Transmitter supply inactive); up to 865 mA at 24 V (Transmitter supply active)

• Maximum Thermal Power Loss: 11 W total heat dissipation at peak load

• Hardware Architecture Options: Supports full dual-card hardware redundancy mappings

• Environmental Temperature Boundaries: 0°C to +50°C (32°F to 122°F) with active cabinet rack cooling

• Net Device Weight: 1.23 lbs (Approx. 0.56 kg)

Industrial Application Scenarios

The ABB CAI20 analog input module is widely deployed across infrastructure networks managed by ABB Symphony architectures, such as municipal water treatment complexes, thermal power generation utilities, pulp and paper facilities, and chemical manufacturing centers. The board is installed within central or remote I/O termination racks where it aggregates vast numbers of field loops. It maps process data—such as liquid levels in storage tanks, main line steam pressures, raw fluid flow rates, and chemical temperature matrices—from heavy-duty field instrumentation. Because of its capability to power 2-wire field instruments directly while simultaneously passing HART asset management data, the module is a staple for minimizing field wiring footprints.