Description

The ABB AI620 is a high-precision, 16-channel analog input module designed for use within ABB’s Advant Controller 400 and Advant OCS (Open Control System) families. This module serves as a critical interface between the process world and the control system, reliably converting analog signals from field transmitters (measuring parameters like temperature, pressure, flow, and level) into high-resolution digital values for the central processing unit. As a cornerstone of ABB’s distributed control system (DCS) architecture, the AI620 module provides essential data acquisition capabilities that form the foundation for precise process monitoring, advanced control strategies, and operational decision-making.

Engineered for demanding industrial environments, the ABB AI620 offers exceptional signal conditioning and electrical isolation, protecting the sensitive control system from noise, ground loops, and transient voltages present in the plant environment. Its modular design allows for easy installation and maintenance, supporting hot swapping in configured systems to minimize downtime. The robustness and reliability of the ABB AI620 make it an indispensable component for ensuring data integrity and system availability in continuous process applications, delivering long-term value and operational confidence.

AI620 ABB

Technical Specifications

Parameter Name	Parameter Value
Product Model	AI620
Manufacturer	ABB
Product Type	Analog Input Module
Number of Channels	16 (single-ended or differential)
Input Signal Types	±20 mV, ±60 mV, ±1 V, ±5 V, ±10 V, 0-20 mA, 4-20 mA
Resolution	15 bits + sign bit
Accuracy	±0.1% of full scale (at 25°C/77°F)
Input Impedance	>10 MΩ for voltage inputs, 50 Ω for current inputs
Common-Mode Rejection	>120 dB at 50/60 Hz
Isolation	Channel-to-channel and channel-to-bus isolation (500 V AC)
Power Supply	+5 V DC (from bus)
Operating Temperature	0 to 60 °C (32 to 140 °F)

Main Features and Advantages

The ABB AI620 distinguishes itself through a combination of high density, superior accuracy, and robust construction. Its 16-channel capacity optimizes cabinet space and reduces per-point cost, a significant advantage in large-scale automation projects. Each channel is individually configurable via software, allowing a single AI620 module to handle a diverse mix of signal types from various field instruments simultaneously, which simplifies spare parts inventory and engineering.

A key feature is its exceptional electrical isolation. The module provides galvanic isolation between each input channel, between the channels and the internal logic, and between the internal logic and the fieldbus. This multi-level isolation strategy effectively eliminates ground loops and protects the entire controller backplane from damaging high-voltage transients and noise commonly found in industrial settings, ensuring unparalleled signal integrity and system reliability. Furthermore, the module supports advanced diagnostics, continuously monitoring for open circuits, short circuits, and signal out-of-range conditions, enabling predictive maintenance and reducing mean time to repair (MTTR).

Application Field

The ABB AI620 analog input module is deployed across a wide spectrum of process industries where reliable data acquisition is paramount. In the oil and gas sector, it is integral to upstream extraction, midstream transportation, and downstream refining processes, connecting to pressure transmitters on distillation columns, temperature sensors in catalytic crackers, and flow meters along pipelines. Within chemical and pharmaceutical manufacturing, the AI620 provides the precise measurement capabilities required for batch processes, reactor temperature control, and ingredient dosing, ensuring product quality and recipe consistency.

Power generation facilities, including thermal, hydroelectric, and combined-cycle plants, utilize the ABB AI620 for monitoring critical parameters such as turbine bearing temperatures, condenser vacuum levels, and feedwater flow rates. Its robustness also makes it suitable for water and wastewater treatment applications, where it interfaces with pH probes, chlorine analyzers, and level sensors in harsh, corrosive environments. Essentially, the ABB AI620 is the trusted data gateway for any continuous or batch process controlled by an ABB Advant OCS or AC 400 system.

AI620 ABB

Related Products

AO620: The analog output counterpart to the AI620, used for sending control signals to field actuators like control valves.

DI620: Digital input module for reading on/off signals from switches, pushbuttons, and relays.

DO620: Digital output module for controlling on/off devices such as solenoid valves, motor starters, and alarms.

CI620: Communication interface module for connecting the controller to various fieldbus networks and subsystems.

DSQC Series I/O: ABB’s later generation of I/O modules for their System 800xA and AC 800M controllers, offering enhanced performance and integration.

S800 I/O: A distributed I/O system that often works alongside or as an evolution of the Advant OCS platform.