PLC industrial control technology is used to explore the logic control of switching quantity. The PLC industrial control technology switch replaces the role of the relay. In addition to controlling a single device, it can also control multiple groups or automated pipelines, and achieves highly reliable automatic switching control. It is commonly used in large-scale machines such as injection molding machines, combination machine tools, packaging lines, and bookbinding machines. Research on analog quantity control of PLC industrial control technology system. The PLC has multiple modules, including six modules: host, communication, high-speed counting, position control, I/O, and analog control. Based on the characteristics of the control object, the PLC is constructed into a comprehensive control system through the combination of multiple functional modules to achieve flexible system control. The advantage of using the PLC analog quantity control module is that it can not only perform process control, but also use control statements to achieve the purpose of monitoring the instrument. The system analog quantity control of PLC industrial control technology greatly improves the accuracy of the process control system. The system analog quantity control can strictly control and control the heating process, cooling process and heat preservation process of the heat treatment, which greatly facilitates the control and maintenance operations in the heat treatment process, which is incomparable with the traditional instrument control system. (Finish) Shenzhen Longyin Printing Packing Co., Ltd. , https://www.longyinprint.com