PLC's domestic and international situation and future prospects

In the industrial production process, a lot of switching sequence control, which in accordance china programmable logic controller with the conditions of the order to move a logical and controlled chain protection action in accordance with the logic of relations, and a large number of discrete data collection. Traditionally, these functions are controlled by pneumatic or electrical system to achieve. 1968 American GM (General Motors) companies to replace the electrical Plc high speed counting modules control device, following the requirements of the second year, the United States Digital Equipment Corporation (DEC) developed a control device based on the integrated circuit and electronics technology, first applied to adopt procedural means electrical control, this is the first generation of programmable logic controller, called Programmable, is recognized as the world's first PLC.