Another advantage of PLC over relay control is that it can arbitrarily change the control structure(or control process)according to actual needs,which requires convenient and quick changes to the program.
Some manufacturers’PLC products provide some special modules,such as communication modules,PID control modules,counter modules,analog input/output modules,etc.Corresponding program blocks are also provided in the software,which can be realized by simply inputting some parameters,which is convenient for users to program.
PLC较继电器控制的另一个优势在于它可以根据实际需要任意更改控制结构(或控制过程),这就要求更改程序方便快捷。
部分生产厂家的PLC产品提供一些专用模块,如通信模块、PID控制模块、计数器模块、模拟输入/输出模块等。在软件上也提供了与此相对应的程序块,往往只是简单的输入一些参数就能实现,便于用户编程。
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