COMAU 10906280

发布时间:2016-09-09

COMAU 10906280

COMAU 10906280
COMAU 10906280

PLC是什幺呢?PLC的全称是Programmable Logic Controller(可编过程控制器),刚引入国内时,曾简称为PC。后来,IBM-PC获得广泛应用,PC成了个人电脑的代名词,才改为PLCPLC还有另外的一个意思是Power Line Carrier(电力线载波)。 
PLC是一种产品,但这种产品有点特别,在没有下载控制程序之前,它不具备任何控制功能,也就是说,没有应用程序的PLC是毫无用处的。PLC实际上是专为工业环境使用的通用控制平台,它必须进行二次开发才能完成终控制目的,因此,它还需程序编辑/调试软件的配合。 
PLC是智能产品,它的核心控制器采用什幺方案呢?板级的CPU肯定是不能考虑的,MPU也要好几块集成电路构成,以Z80 MPU为例,需要Z80MPU、PIO、CTC、SIO、EPROM、SRAM等,把这些集成电路安装在一块电路板上,这就是早期的单板计算机。这种方案体积太大,不适合现代要求。由此可见,PLC的核心控制器采用单片机是合适的。 

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