施耐德产品140DDI35310C Quantum

140DDI35310C Quantum

140DDI35310C

1、系统程序存储器

系统程序存储器用来存放由可编程控制器生产厂家编写的系统程序，并固化在ROM内，用户不能直接更改。系统程序质量的好坏，很大程度上决定了PLC的性能。

其内容主要包括三部分：第一部分为系统管理程序，它主要控制可编程控制器的运行，使整个可编程控制器按部就班地工作，第二部分为用户指令解释程序，通过用户指令解释程序，将可编程控制器的编程语言变为机器语言指令，再由CPU执行这些指令；第三部分为标准程序模块与系统调用程序。

2、用户程序存储器

根据控制要求而编制的应用程序称为用户程序。用户程序存储器用来存放用户针对具体控制任务，用规定的可编程控制器编程语言编写的各种用户程序。

目前较先进的可编程控制器采用可随时读写的快闪存储器作为用户程序存储器，快闪存储器不需后备电池，掉电视数据也不会丢失。

3、工作数据存储器

工作数据存储器用来存储工作数据，既用户程序中使用的ON/OFF状态、数值数据等。在工作数据区中开辟有元件映像寄存器和数据表。其中元件映像寄存器用来存储开关量、输出状态以及定时器、计数器、辅助继电器等内部器件的ON/OFF状态。数据表用来存放各种数据，它存储用户程序执行时的某些可变参数值及A/D转换得到的数字量和数字运算的结果等。

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