General motors ( GM) Request the top ten of the new controller and PLC

With the continuous development of computer control technology, the application of programmable controller has been widely spread and become an important automation technology. Programmable controller first appeared in the United States, in 1968, the American carmaker general motors ( GM) Put forward the development of a new type of controller, and puts forward a new generation of controller from the Angle of users should have the following ten conditions: ( 1) Programming is simple, can modify the program at the scene; ( 2) Easy maintenance, it is best to plug-in; ( 3) Reliability is higher than the relay control cabinet; ( 4) Volume smaller than that of relay control cabinet; ( 5) Data can be directly into the management computer; ( 6) On costs to compete with relay control cabinet; ( 7) Input can be ac 115 v ( With America's power grid voltage) ; ( 8) Output for ac 115 v, 2 a) above, can direct drive solenoid valve; ( 9) In extension, the original system only need a small changes; ( 10) At least could extend to the user program memory capacity of 4 KB. The condition is raised, immediately caused a development boom. In 1969, the United States, digital equipment corporation ( 12月) Developed the world's first programmable controller, and applied to the production line of general motors. At the time called PLC controller (programmable logic controller 可编程逻辑控制器) , the purpose is to replace relay, to perform logic, timing, counting and sequence control function. Followed by MODICON company also developed the controller with the same name in the United States, in 1971, introduced the new technology from the United States, Japan, soon became the first programmable controller in Japan. In 1973, western European countries have developed their first programmable controller.
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