Here are some key features of the ABB AI815 module:

Analog input channels: The AI815 module supports up to 8 analog input channels. Each channel can accept a wide range of analog signals, such as voltage, current, resistance, and thermocouples.

Signal conversion: The module converts the analog signals received from the field devices into digital values with high accuracy and resolution. It has an internal analog-to-digital converter (ADC) that performs this conversion.

Signal isolation: The AI815 module provides galvanic isolation between the field devices and the PLC. This isolation protects the PLC from electrical noise, voltage spikes, and other disturbances that may be present in the field.

Communications: The AI815 module communicates with the PLC through a communication bus. It supports the PROFIBUS DP communication protocol.

Diagnostic features: The module offers diagnostic functions for monitoring the status of the analog input channels. It can detect faults like broken wires, sensor failures, and out-of-range input signals, providing useful information for troubleshooting and maintenance.