摘要
通过实例,阐述了PLC与继电器电路比较,外部电路结构简单,而逻辑控制也不同于继电器电路,它是用编程语言编写的软件程序。因此,要想改变逻辑控制,无需改变外部电路,只须改变软件程序就行了。
According to some example,a PLC's outer circuit is proved much more uncomplicated than a relay circuit. The logical control is also different from a relay circuit. It is used logical language to make up software programme. So if you want to change logical control, just make over the software programme, and don' t need to change the outer circuit.
出处
《煤矿机械》
北大核心
2009年第6期166-167,共2页
Coal Mine Machinery