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这是PLC厂家采用多的编程语言,初是由继电器控制图演变过来的,比较简单,对离散控制和互锁逻辑为有用;
(2)顺序功能图
它提供了总的结构,并与状态定位处理或机器控制应用相互协调;
(3)功能块图
它提供了一个有效的开发环境,并且特别适用于过程控制应用;
(4)结构化文本
这是一种类似用于计算机的编程语言,它适用于对复杂算法及数据处理;
(5)指令表
它为优化编码性能提供了一个环境,与汇编语言相似。
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