数据存在西门子200vd0与vw0数据数据恢复会不会泄密重叠

西门子PLC中 DB6.DBW0是什么意思_百度知道
西门子PLC中 DB6.DBW0是什么意思
DB6.DBW0在西门子S7-300/400/0系统中,表示6#数据块(Data Block)中的偏移地址为零的寄存器;若是偏移地址为2,则为DB6.DBW2;若是数据格式为双字、双整数或浮点数,则为DB6.DBD0;若是数据格式为字节,则为DB6.DBB0;若是数据格式为位,则为DB6.DBX0.0;
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提问者采纳
DB6.DBW0DB6: DB块的名称;DBW0:在DB6这个数据块内,以字访问,地址为0;就是DB6数据块内的第一个数据,以字方式访问。
那DB6.DBX0.0 BYTE4这个是什么意思呢
DBX0.0 是以bit方式访问,第一个字节的第一个(低位)bit.“ BYTE4”,没这写法,不会跟在DB6.DBX0.0后。访问DB内数据,无非就是以位,字节,字,双字的方式来访问,直接寻址的方法分别对应:DBX??、DBB??、DBW??、DBD??当然,也可以通过变量名访问。
谢谢,但是那个P#DB9.DBX0.0 BYTE4 这个是真的有啊,我以为是从第四个字节开始呢。
其他4条回答
db6数据块的第一个字存储单元。西门子300plc不像200或者日系的plc数据单元统一编址vw0,mw0就可以表示的。他是把数据放在各个数据块里的,这样你可以方便把一类数据放在同一个数据块里面,这样更容易实现结构化编程。就像我你是机电学院的学生,我先去机电学院然后再去你的班级就能找到你了
DB6.DBW0 DB6 是数据块名称DBW0是指DB6数据的第一个字
P#DB9.DBX0.0 BYTE4 后面的BYTE4的意思是4个字节,从0.0到3.7 ,该句程序可以与西门子调速装置进行通信
DB9是背景数据块
DBX0.0是一个位
如果是DBW则是访问字
DBD是双字的意思
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出门在外也不愁OD-120037-MEL (ETC [本变频器200V 0.37KW\n]) PDF技术资料下载
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