描述
存储器容量是可编程序控制器本身能提供的硬件存储单元大小，程序容量是存储器中用户应用项目使用的存储单元的大小，因此程序容量小于存储器容量。设计阶段，由于用户应用程序还未编制，因此，程序容量在设计阶段是未知的，需在程序调试之后才知道。为了设计选型时能对程序容量有一定估算，通常采用存储器容量的估算来替代。
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