AS-M680-108
AS-M680-108
AS-M680-108
在了解了程序结构和编程方法的基础上，就要实际地编写 PLC程序了。编写 PLC 程序和编写其他计算机程序一样，都需要经历如下过程。
1) 对系统任务分块
分块的目的就是把一个复杂的工程，分解成多个比较简单的小任务。这样就把一个复杂的大问题化为多个简单的小问题。这样可便于编制程序。
2) 编制控制系统的逻辑关系图
从逻辑关系图上，可以反应出某一逻辑关系的结果是什么，这一结果又英国导出哪些动作。这个逻辑关系可以是以各个控制活动顺序为基准，也可能是以整个活动的时间节拍为基准。逻辑关系图反映了控制过程中控制作用与被控对象的活动，也反应了输入与输出的关系。
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