Then, as a related art of this kind of image processing apparatus 10, an image processing apparatus (image forming apparatus) provided with expansion devices (option units) that are detachable from a main body has been known. In the image processing apparatus according to the related art, power is supplied from a power supply portion to multiple loads such as each component of the main body and the expansion devices. Here, the image processing apparatus according to the related art calculates a total power of a system based on power consumption information that is transmitted from each expansion device to the main body, and detects whether the total power exceeds a specified value.

In a configuration of the above-described related art, the total power may exceed the specified value depending on the number or type of loads connected to the power supply portion. In such a case, for some loads (expansion devices, etc.), power needs to be supplied from an expansion power supply portion that is different from the power supply portion of the main body. However, the image processing apparatus of the related art only detects whether the total power exceeds the specified value. Therefore, even when the power supply portion of the main body, instead of the expansion power supply portion, is incorrectly connected to the expansion devices, such power supply portion may be used as it is.

On the other hand, in the present embodiment, the following configuration realizes the image processing apparatus 10 which easily realizes an appropriate connection relationship between the power supply portion and the loads.