Manipulator is a kind of auxiliary control equipment often used in the field of industrial production and processing automation. With the development of industrial production and processing automation in recent years, especially after China proposed the "Made in China 2025" strategy, manipulator has gradually become a popular product. With the development of China's own industrial technology and the encouragement of the government, the robot has developed rapidly. Manipulator is an important means to improve labor productivity, improve labor conditions, reduce labor intensity of workers and realize industrial production automation. With the proposal of Industry 4.0, both at home and abroad attach great importance to its application and development.

Truss manipulators were earlier used in the automobile manufacturing industry, and they are also widely used in automobile manufacturing, commonly used in welding, painting, loading and unloading, and handling. Manipulators extend and expand the functions of people's hands, feet and brain. They can replace people in dangerous, harmful, toxic, low temperature, high heat and other harsh environments; Complete heavy, monotonous and repetitive labor instead of people, improve labor productivity and ensure product quality. At present, it is mainly used in manufacturing industry, especially in electrical appliance manufacturing, automobile manufacturing, plastic processing, general machinery manufacturing and metal processing industries. Manipulators and CNC machining centers, automatic handling trolleys and automatic detection systems can form flexible manufacturing systems (FMS) and computer integrated systems (CIMS) to realize the automation of production and processing.

Because automation can save a lot of manpower, material resources, etc., and PLC also has special advantages that other control methods do not have, such as good versatility, strong practicality, complete hardware support, and simple programming methods, PLC is widely used in the industrial field, such as fruit picking manipulator to pick fruit, intelligent robot on the assembly line, etc. It can be seen that the application of manipulator in mechanical industry will be more extensive.