A02B-0236-C612;
供应A02B-0236-C612;
A02B-0236-C612;
PLC广泛使用梯形图代替计算机语言，对编程有一定的优势。你可以把梯形图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运行的只是机器码而已。梯形图只是让使用者更加容易使用而已。
如所说，那么MCS-51单片机当然也可以用于PLC制作，只是8位CPU在一些高级应用如： 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，不过加上DSP就已经能满足一般要求了，而且同样使用梯形图编程，我们可把梯形图转化为C51再利用KEIL的C51进行编译。我们也能发现不用型号的PLC会选用不同的CPU，其实也说明PLC就是一套已经做好的单片机系统。
PLC的关键技术在于其内部固化了一个能解释梯形图语言的程序及辅助通讯程序，梯形图语言的解释程序的效率决定了PLC的性能，通讯程序决定了PLC与外界交换信息的难易。对于简单的应用，通常以独立控制器的方式运作，不需与外界交换信息，只需内部固化有能解释梯形图语言的程序即可。实际上，设计PLC的主要工作就是开发解释梯形图语言的程序。现在的单片机完全可以取代PLC。以前的单片机由于稳定性和抗电磁干扰能力比较的弱和PLC是没有办法相比的 现在的单片机已经做到了高稳定性和很强的抗干扰能力在某些领域已经实现了替换。
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