1968年美国的汽车制造商―通用汽车（GM）公司，为适应汽车型号不断更新，提出把计算机的完备功能以及灵活性、通用性好等优点和继电器一接触器控制系统的简单易懂、操作方便、价格便宜等优点结合起来，做成一种能适应工业环境的通用控制装置，并把编程方法和程序输入方式加以简化，使不熟悉计算机的人员也能很快掌握它的使用技术。根据这一设想，美国数字设备公司（DEC）于1969年率先研制出台可编程序控制器（简称PLC），在通用汽车公司的自动装配线上试用获得成功。从此以后，许多国家的厂商竞相研制，各自形成系列，而且品种更新很快，功能不断增强，从初的逻辑控制为主发展到能进行模拟量控制，具有数据运算、数据处理和通信联网等多种功能。PLC另一个突出优点是可靠性很高，平均无故障运行时间可达10万小时以上，可以大大减少设备维修费用和停产造成的经济损失。当前PLC已经成为电气自动控制系统中应用为广泛的核心装置。
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