Network system providing redundant power supply configuration

A network system comprising:

• a higher-level device;
• a first intermediate device connected to the higher-level device so as to communicate with the higher-level device, the first intermediate device being configured to control supply of an electric power to a first lower-level device via a first device being able to be controlled to interrupt;
• and
• a second intermediate device connected to the higher-level device so as to communicate with the higher-level device, the second intermediate device being configured to control supply of an electric power to a second lower-level device via a second device being able to be controlled to interrupt, the second lower-level device being a redundant component for the first lower-level device, wherein
• the higher-level device includes a first channel communication device configured to perform first channel communication, and a second channel communication device configured to perform second channel communication,
• the first intermediate device is connected to the first channel communication device of the higher-level device, and
• the second intermediate device is connected to the second channel communication device of the higher-level device.