1756-OA16I 1756-OA16I

发布时间:2017-09-19

1756-OA16I

1756-OA16I

1756-OA16I

PLC的软件由系统程序和用户程序组成。

系统程序由PLC制造厂商设计编写的,并存入PLC的系统存储器中,用户不能直接读写与更改。系统程序一般包括系统诊断程序、输入处理程序、编译程序、信息传送程序、监控程序等。

 PLC的用户程序是用户利用PLC的编程语言,根据控制要求编制的程序。在PLC的应用中,重要的是用PLC的编程语言来编写用户程序,以实现控制目的。由于PLC是专门为工业控制而开发的装置,其主要使用者是广大电气技术人员,为了满足他们的传统惯和掌握能力,PLC的主要编程语言采用比计算机语言相对简单、易懂、形象的语言。

 PLC编程语言是多种多样的,对于不同生产厂家、不同系列的PLC产品采用的编程语言的表达方式也不相同,但基本上可归纳两种类型:一是采用字符表达方式的编程语言,如语句表等;二是采用图形符号表达方式编程语言,如梯形图等。

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