The PLC is how to produce? PLC and auto production line

In the 60 s, automobile production line automatic control system is essentially composed of relay control device. When car every retrofit led directly to the redesign and installation of relay control device. With the development of production, vehicle model update cycle more and more short, so, relay control device will need to frequently redesign and installation, time-consuming, work, material fee, even hindered the update cycle shortened. In order to change this situation, the United States in 1969, general motors open tender, calls for new device control instead of relay control, and puts forward ten measures of bidding, namely: ( 1) Programming is convenient, the scene can modify the program; ( 2) Convenient maintenance, adopting the modular structure; ( 3) Reliability is higher than the relay control device; ( 4) Volume is less than the relay control device; ( 5) Data can be directly sent to the management computer; ( 6) Costs to compete with relay control device; ( 7) Input can be ac 115 v. ( 8) The output of ac 115 v, 2 a) above, can direct drive solenoid valve, contactor, etc. ; ( 9) In extension, the original system as long as a small changes; ( 10) At least could extend to the user program memory capacity of 4 k. In 1969, the United States, digital equipment corporation ( 12月) Gm in the United States, developed the first PLC automatic assembly line, a success. This new type of industrial control device with its simple, convenient operation, high reliability, flexible, small volume, long service life, and a series of advantages, other industrial sectors in the United States application quickly. In 1971, has been successfully used in food, beverage, metallurgy, paper making industries. The emergence of a new type of industrial control device, also attaches great importance to by the rest of the world. Introduced the new technology from the United States, Japan, 1971 soon developed Japan first PLC controller. In 1973, western European countries have developed their first PLC controller. From 1974 began to develop in our country. In 1977, began to industrial applications.
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