1C31233G04
1C31233G04
1C31233G04
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PLC其实就是一套已经做好的单片机（单片机范围很广的喔）系统.
PLC的梯形图你可以理解成是与汇编等计算器语言一样是一种编程语言,只是使用范围不同!而且通常做法是由PLC软件把你的梯形图转换成C或汇编语言（由PLC所使用的CPU决定）,然后利用汇编或C编译系统编译成机器码!PLC运行的只是几器码而已.梯形图只是让使用者更加容易使用而已.
同样MCS-51单片机当然也可以用于PLC制作,只是8位CPU在一些应用如:大量运算（包括浮点运算）,嵌入式系统（现在UCOS也能移植到MCS-51）等,有些力不从心而已.我公司在使用的一套工业系统就是使用MCS-51单片机做的,不过加上DSP而已,已经能满足我们要求（我们设备速度较慢,而且逻辑控制为主,但是点数不少喔,128点I/O呢!!）,而且同样使用梯形图编程,我们在把我们的梯形图转化为C51再利用KEIL的C51进行编译.你没有注意到不用型号的PLC会选用不同的CPU吗!!
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