The origin of PLC

The origin of PLC

In 1968, general motors of the United States proposed to replace relay control device;

In 1969, the American digital equipment company developed the first programmable logic controller pdp-14, which was successfully used in the production line of General Motors Company of the United States. It was the first generation of programmable logic controller, called programmable logic controller (PLC) for short, and was recognized as the first PLC in the world.

In 1969, the United States developed the world's first pdp-14;

In 1971, Japan developed the first dcs-8;

In 1973, Siemens of Germany developed the first PLC in Europe, the model is SIMATIC S4;

In 1974, China developed the first PLC and began industrial application in 1977.