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1756-OF8
1756-OF8
一.逻辑阶段
所谓的逻辑阶段就是可以实现继电系统中的一般逻辑性设计，既然是继电系统所以电力拖动知识就是该阶段的基础。我个人总结学习继电系统的根在于一个字“抢”，继电系统之所以能实现逻辑控制就在这个字上。继电系统中主要就有那么三个东东A常开；B常闭；C线圈。这就对应了plc中的基本元素了，只不过是阅读的方法不一样罢了。
那么是不是就可以把原来的继电系统照搬呢？不行！二者的工作方式是不一样的。继电系统中的所有硬元素同一时态开始竞争的，而PLC中的所有软元素是通过PLC的CPU来进行扫描计算处理最后计算出该时态的结果,这便是PLC的扫描循环工作方式。(随便找一本PLC的书都有介绍)
重点：该阶段就是学习电力拖动，对应于PLC梯形图中的常开；常闭；线圈。可以完成简单的系统设计
二．顺控阶段
顺序控制在工业中的应用相当广泛，例如一般性的自动机床它就是一个顺序控制过程。PLC设计当中能实现顺控的有两种方法：一 PLC中的顺控指令如三菱 STL ；二 起保停控制方式。不管哪种控制方式在设计的开始我们要完成的是流程，它是系统构成的脉络主要有三个方面：一 “步” 二 “活动步” 三 “转换条件”。
重点：1.掌握系统脉络设计系统流程
2.掌握“起保停”控制方式，把流程图转换成梯形图可以完成一般性的系统设计
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