摘要：Using 4G network intelligence as the data transmission channel of field and monitoring centre, a sewage treatment monitoring system with simple structure, stable performance, fast transmission rate and high accuracy is established. In this paper, USR-G780 DTU is selected as the transceiver of network equipment. PLC was initialized through ladder diagram programming, and information such as water quality parameters in sewage treatment and online operation status of each equipment was transmitted to the monitoring centre, and remote connection between S7-1200 and the monitoring centre was completed. In addition, Modbus RTU communication protocol is used to complete the communication between the field PLC and the slave station, as well as TCP/IP to complete the data network transmission, and finally complete the design of the whole communication process. The experiment proves that the data based on 4G intelligence is more accurate, the transmission efficiency is greatly improved, and the feasibility, accuracy and security of the system design scheme are also verified.
