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厂家提供的编程软件中一般包括一种或几种编程语言,如TE公司的XTEL编程软件可以使用梯形图(Ladder)、顺序功能图(Grafcet)、结构化文本(Literal)3种编程语言;Siemens公司的Step7编程软件可以使用梯形图(Ladder)、指令表(STL)两种编程语言;Modicon公司的Modsoft编程软件只使用梯形图(984梯形)一种编程语言,而另一个Concept编程软件可以使用5种编程语言,依次为梯形图(LD)、顺序功能图(SFC)、功能块图(FBD)、结构化文本(ST)、指令表(IL)。同一编程软件下的编程语言大多数可以互换,一般选择自己比较熟悉的编程语言。
3、存储器
PLC存储器是保存程序和数据的地方,分内制式和外插式两种,存储器容量在512~128M字节之间,一定要根据实际情况选取足够大的存储器,并且要求有一部分空余作为缓存。
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