ABB IO modules are mainly of the following types:

Digital Input/Output (DI/DO) Modules: these modules are used to process binary signals such as signal inputs for push buttons, switches, limit switches, etc. as well as signal outputs to control solenoid valves, relays etc.

Analog Input/Output (AI/AO) Modules: These modules are used to process continuously changing signals, such as signal inputs for temperature, pressure, flow, etc., as well as signal outputs for controlling motor speeds, valve openings, etc.

Special Function Modules: These include modules for specific applications, such as safety modules, Ethernet communication modules, bus interface modules, and so on.

The voltage and current input is able to withstand an overvoltage or undervoltage of at least 11 V d.c. The input resistance for voltage input is greater than 10 M ohm and the input resistance for current input is 250 ohm.

The module distributes the external HART compatible transmitter supply to each channel. This adds a simple connection to distribute the supply to 2-wire or 3-wire transmitters. The transmitter power is supervised and current limited.

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