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In 1969, the American Digital Equipment Company developed the first programmable controller (PDP-14), which was tested on General Motors’ production line and showed significant results; In 1971, Japan developed the first programmable controller (DCS-8); In 1973, Germany developed the first programmable controller; In 1974, China began developing programmable controllers.

In 1977, China promoted PLC in industrial applications.

The initial purpose was to replace mechanical switching devices (relay modules). However, since 1968, the functions of PLCs have gradually replaced relay control boards, and modern PLCs have more functions. Its purpose extends from single process control to the control and monitoring of the entire manufacturing system.

development

In the early 1970s, microprocessors emerged. People quickly introduced it into programmable logic controllers, which added functions such as computation, data transmission, and processing, completing industrial control devices that truly have computer characteristics. The programmable logic controller at this time is a product of the combination of microcomputer technology and conventional relay control concepts

After the development of personal computers, in order to facilitate and reflect the functional characteristics of programmable controllers, programmable logic controllers were named Programmable Logic Controller (PLC).In the late 1970s, programmable logic controllers entered the stage of practical development