Overview

The ABB AI820 Analog Input Module is a high-accuracy analog acquisition unit designed for AC 800M controllers and the S800 I/O system. It provides 4 differential, bipolar channels, each configurable for current or voltage inputs, making it suitable for a wide range of industrial measurement applications.

The supported ranges—±20 mA, 0(4)…20 mA, ±10 V, ±5 V, and 0(1)…5 V—allow interfacing with standard transmitters and specialty sensors. The module includes galvanic isolation between channels and the ModuleBus, ensuring noise-free and safe operation.

For protection, each current input path includes 250 Ω / 5 W resistors, offering temporary overvoltage tolerance (e.g., accidental 24 V connection). As a result, the AI820 is widely adopted across process industries, power generation, and factory automation where stable, accurate analog measurement is crucial.

Technical Data

Typical Applications

• Process industries: Measuring flow, pressure, level, and temperature transmitters.

• Power generation: Reading analog feedback from turbines, boilers, and auxiliary plant equipment.

• Water treatment: Monitoring pH, conductivity, turbidity, and other 4–20 mA sensors.

• Manufacturing automation: Capturing analog feedback from actuators, drives, or proportional valves.

• Infrastructure systems: Supporting building automation and public-utility monitoring.

Example: In a chemical plant, the AI820 reads 4–20 mA pressure transmitters to support accurate reactor and pipeline control.

FAQ

Q1: How many channels does the AI820 provide?
A1: It offers 4 differential, bipolar analog input channels.

Q2: What signal ranges are supported?
A2: ±20 mA, 0(4)…20 mA, ±10 V, ±5 V, and 0(1)…5 V.

Q3: Is the module isolated?
A3: Yes. All channels are galvanically isolated from the ModuleBus.

Q4: Which controllers is it compatible with?
A4: ABB AC 800M controllers and the S800 I/O system.