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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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发表于 2020-5-21 17:41:00 | 显示全部楼层 |阅读模式
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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