1794-OW8

1794-OW8

1794-OW8

1794-OW8

PLC的编程语言与一般计算机语言相比，具有明显的特点，它既不同于***语言，也不同与一般的汇编语言，它既要满足易于编写，又要满足易于调试的要求。目前，还没有一种对各厂家产品都能兼容的编程语言。如三菱公司的产品有它自己的编程语言，OMRON公司的产品也有它自己的语言。但不管什么型号的PLC，其编程语言都具有以下特点：  

　　1.图形式指令结构：程序由图形方式表达，指令由不同的图形符号组成，易于理解和记忆。系统的软件开发者已把工业控制中所需的***运算功能编制成象征***形，用户根据自己的需要把这些图形进行组合，并填入适当的参数。在逻辑运算部分，几乎所有的厂家都采用类似于继电器控制电路的梯形图，很容易接受。如西门子公司还采用控制系统流程图来表示，它沿用二进制逻辑元件图形符号来表达控制关系，很直观易懂。较复杂的算术运算、定时计数等，一般也参照梯形图或逻辑元件图给予表示，虽然象征性不如逻辑运算部分，也受用户欢迎  

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