在使用中了解PLC以及与继电器电路的区别

Learnt about Difference between PLC and Relay Circuit in Using

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.