IC693DSM302-AE

IC693DSM302-AE

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，zui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习惯和掌握能力，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。

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