I/O EXPANSION DEVICE, CONTROL SYSTEM, AND AUTOMOTIVE SYSTEM

According to one embodiment, an I/O expansion device configured to communicate with a master circuit and an electrical component includes a port circuit configured to transmit an output signal to the electrical component based on a first input signal from the master circuit, a memory that stores first setting data set by the first input signal from the master circuit, a comparison circuit configured to compare second setting data set by a second input signal from the master circuit with the first setting data stored in the memory and transmit an abnormality signal to the master circuit when the second setting data is not identical with the first setting data.