140CRA21110
140CRA21110
140CRA21110
状态监控指令,用以监视及记录PLC及其控制系统的工作状态,对提高PLC控制系统的工作可靠性大有帮助。
当然,并不是所有的PLC都有上述那么多类的指令,也不是有的PLC仅有上述几类指令。以上只是指出几个例子,说明要从哪几个方面了解PLC指令,从中也可大致看出指令的多少及功能将怎样影响PLC的性能。
除了指令,为进行通讯,PLC还有相应的协议与通讯指令或命令,这些也反映了PLC的性能。
6支持软件
为了便于编制PLC程序,多数PLC厂家都开发有关计算机支持软件。
从本质上讲,PLC所能识别的只是机器语言。它之所以能使用一些助记符语言、梯形图语言、流程图语言,以至***语言,全靠为使用这些语言而开发的种种软件。
助记符语言是***基本也是***简单的PLC语言。它类似计算机的汇编语言,PLC的指令系统就是用这种语言表达的。这种语言仅使用文字符号,所使用的编程工具简单,用简易编程器即可。所以,多数PLC都配备有这种语言。
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