MFC300-KEOHNE-现货

易卖工控网（www.ymgk.com）提供”MFC300-KEOHNE-现货”，产品详情：品牌/厂家：KEOHNE、型号：MFC300、成色：全新、货期：现货 1天内发货、保修：180天，更多产品详情就上易卖工控网。

　 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： 

　　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独立运算功能编制成象征性图形，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
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