新手入门PLC需要了解的问题，PLC该学什么，怎么学习？

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为什么你学了那么久PLC，时间精力花了不少，感觉学了很多，可一到具体问题就无法解决？为什么你学了那么多的PLC指令，却连个简单的梯形图都编不出？为什么你感觉自己精通西门子S7-200Smart，但给你个S7-1200，你又感觉无从下手，像是换了个PLC，又要重新学习？？

所以，对于没有实际工程经验的初学者来说，最需要解决的就是，PLC该学什么，怎么学习？

PLC该怎么学呢？很简单认真学，那么该学什么呢？应该学会原理和方法，而不是品牌和指令。

首先，必须要明白PLC是什么。PLC是专门针对工业环境开发的控制器，它的应用场合是各种工业设备和生产线，因此，从某种意义上来讲，DCS和PLC的界限是模糊的。它们都是用于工业生产的控制器。比如现在很火的口罩机，各种非标自动化设备，印染，纺织机械，食品加工机械，木工机械，以及石油化工，水处理，市政等大型项目，都离不开PLC。所以，那些教你PLC的，讲的例子都是抢答器，喷泉，流水灯，小车正反转等等，这根本就不是一个设计，调试PLC系统的工程师，只不过是懂点皮毛，而没有任何项目经验的灯泡电工。因为他们也不懂PLC。

明白了PLC是干什么的，下面就需要明白PLC是什么了。PLC的实质是一种标准的商品，是有各种PLC制造商生产的商品。因此，它具备商品的一切属性，比如，它有说明书，有使用手册，有各种认证。因此，它的说明书都是生产厂家免费提供的，你见过你买手机，厂家再额外收费卖你说明书的？作为商品，种类繁多，因此，它是有各种型号的。不同的厂家，会对自己的PLC产品命名。这种命名规则，都是厂家自行规定的，比如三菱命名为FX系列，Q系列，西门子有S7-1200.S7-1500。施耐德有M241,M251,M262等。每一种型号，还有细分，用字母和数字的组合来命名产品。这些，查看手册就可以知道。这些不能算PLC知识，就算你不知道也没关系，查手册呗！只需要知道个大概就行，所以，学习PLC，去学习这些型号的命名，有什么意义？还不如研究茴字的四种写法，这至少是学问。而PLC型号字母的含义，就是一个认为的约定，有什么好研究的？

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