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IEC 61131是IEC(国际电工**)制定的有关可编程控制器(PLC)的相关标准，IEC 61131-3是其中的编程语言部分。由于IEC 61131-3自动化编程语言的诸多优点，已成为自动化工业中拥有广泛应用基础的国际标准，而且已不于PLC，还广泛地应用于集散型控制系统、工业控制计算机、数控系统、远程终端单元等产品。
1992年PLCopen成立，这是一个独立于制造商和产品的国际组织，总部位于荷兰。目前已有为数众多的PLC制造商、软件公司和研究院所是这个国际组织的成员。PLCopen专门致力于IEC 61131标准的推广并取得了很大的成功，世界上的自动化设备制造商如西门子、罗克维尔、ABB、施奈德、GE、三菱、富士等都推出了不同程度IEC 61131-3兼容级的产品。
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