PLC is widely used, powerful, and easy to use. It has been widely used in various automatic control systems of mechanical equipment and production processes. PLC has also developed rapidly in other fields, such as civil and home automation applications. PLC is still in constant development, its functions are also continuously enhanced, and it is more open. It is not only the most widely used single automation control device, but also holds an unshakable position in large industrial network control systems. PLC is widely used and its popularity is high, which is unmatched by other computer control equipment.