描述
功能流程图的单流程结构形式简单,如图1所示,其特点是:每一步后面只有一个转换,每个转换后面只有一步。各个工步按顺序执行,上一工步执行结束,转换条件成立,立即开通下一工步,同时关断上一工步。用顺序控制指令来实现功能流程图的编程方法,在前面的章节已经介绍过了,在这里将重点介绍用中间继电器M来记忆工步的编程方法。
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