Network structure of carbon dioxide cascade unit control system

The utility model relates to a network structure of a carbon dioxide cascade unit control system. The carbon dioxide cascade unit is increasingly widely applied to large refrigeration houses, automatic control of the unit needs to be achieved, the operation condition of the unit is monitored through a network, and meanwhile modular refrigeration units need to be combined according to different userequirements so as to meet different use occasions. The utility model discloses a network structure of a carbon dioxide cascade unit control system. The device comprises a base, a first unit (1) anda second unit (2) are included. The first unit is provided with a first host controller (3). A second host controller (4) is arranged in the second unit, the first host controller and the second hostcontroller are connected with each other through the Ethernet and are connected to an upper computer and a programming computer through a switch (5), and the first host controller and the second hostcontroller are connected wit