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自从美国通用汽车公司于1968年使用第一台可编程序控制器以来,可编程序控制器PC的发展极为迅速,应用范围越来越广,目前已经成为工业控制领域中应用最为广泛的标准设备。 最初开发的PC,其目的是为了取代当时广泛使用的、可控范围和灵活性都较差的硬接线继电器控制。但是随着计算机技术和微型机的发展,PC的广泛应用及其性能的不断开发,新的PC不断取代旧的PC,新功能的开发又不断扩大了它的新的应用领域。进入八十年代以米,PC又进入了一个突飞猛进
Since GM used the first programmable logic controller in 1968, the development of programmable logic controller PC has been extremely rapid and has been applied more and more widely. Now it has become the most widely used standard equipment in industrial control field . The originally developed PC was designed to replace hard-wired relay control, which was widely used then with poor controllability and flexibility. However, with the development of computer technology and microcomputers, the extensive application of PCs and the continuous development of their performance, the new PCs continue to replace the old PCs, and the development of new functions has continuously expanded its new application areas. Into the eighties to meters, PC has entered a rapid progress