Industrial control refers to industrial automation control, which is mainly realized by the combination of electronic, electrical, mechanical and software. That is, industrial control, or factory automation control. It mainly refers to the use of computer technology, microelectronics technology and electrical means to make the factory's production and manufacturing process more automatic, efficient, accurate, controllable and visible. The emergence and promotion of industrial control technology brought about the third industrial revolution, which improved the production speed and efficiency of the factory by more than 300%. In the early 1980s, with the spring breeze of reform and opening up, foreign advanced industrial control technology entered the Chinese Mainland. Industrial control products widely used include "PLC, frequency converter, servo motor, industrial control computer", etc. These products and technologies have greatly promoted the automation process of China's manufacturing industry and made great contributions to China's modernization. The emergence of industrial control has improved the safety and accuracy of manufacturing and construction industries, and solved the original industrial needs of temperature, pressure, gas flow, liquid flow, etc. The semi-automatic and manual work that was originally required will be transformed into automatic work, including common air switches, pressure transmitters, flow meters, etc. Working principle of industrial control: for example, the power control of air switch. When the power of the electrical appliance is too high, the internal mechanical principle starts to operate, causing the switch to automatically disconnect, so as to ensure the safe use of electricity in industry or buildings and accurately find the source of short circuit.