PLC 问世以来，尽管时间不长，但发展迅速。为了使其生产和发展标准化，美国电气制造商协会 NEMA(National Electrical Manufactory Association) 经过四年的调查工作，于 1984 年首先将其正式命名为 PC(Programmable Controller),并 给 PC 作了如下定义：“PC 是一个数字式的电子装置，它使用了可编程序的记忆体储存指令。
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