IC697ACC800
IC697ACC800
IC697ACC800
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。
在图1中,当n-1为活动步时,转换条件b成立,则转换实现,n步变为活动步,同时n-1步关断。由此可见,第n步成为活动步的条件是:Xn-1=1,b=1;第n步关断的条件只有一个Xn+1=1。用逻辑表达式表示功能流程图的第n步开通和关断条件为:
式中等号左边的Xn为第n步的状态,等号右边Xn+1表示关断第n步的条件,Xn表示自保持信号,b表示转换条件。
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