It is located in the disinfection room and the water supply pump room, and consists of two layers of network. The upper layer of the next layer is connected to the inverter via Modbus, smart meters and touch screens, and the upper layer is connected to the PC via Ethernet. Outside the plant (water inlet control station and remote detection point), PLC is the core equipment connected through the three-layer network structure. The lower layer is connected to the inverter, intelligent device and touch screen via MODBUS fieldbus