点击图片查看原图
1756-OG16
1756-OG16
三.汇编阶段
该阶段是本质上区别于继电控制系统，是继电控制系统无法实现的，也是提高PLC控制系统功能的根！我之所以称之为汇编阶段，是因为它很相象于单片机的汇编语言编程，例如单片机中的传送指令MOV，在PLC中的高级指令中也是一样的功能。这一阶段难度比较大，第一要学习计算机基础；第二要充分了解PLC的内部功能和资源；第三熟悉所有的高级指令的功能（不用死记硬背）。如果不了解计算机基础的话在学习高级指令和PLC内不资源的时候根本理解不了 ，在设计上的思路和继电系统有很大区别例如：I0.0 和IB0 第一个是“位”也就是逻辑设计的“点”，第二个是“字节”在逻辑设计中没有涉及到。
重点：1. 计算机基础
2．PLC资源
3．指令功能
4．适应单片机的程序设计思维
可以完成复杂的系统设计
四.特殊阶段
特殊阶段就是对特殊功能的系统而言的，例如运动控制，PID温度控制，网络连接等等。不同的PLC能实现的功能不一样，有些功能PLC内是集成的而有些是需要外加扩展的，那么就要根据不同的控制对象去选用了。掌握好该阶段是可以大大提高PLC的程序，但是还需掌握PLC以外的其他自动化知识，如伺服，变频器等等。
重点：1. 了解系统构成需要
2．合理选择扩展单元
3．学习扩展单元使用方法
可以完成特殊的系统设计
该阶段的学习学要一定的实际条件才能完成
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