在大多數計算機系統中,用戶與記憶的互動的應用水平是壹種透明的過程。在大多數情況下,很少或召回程序或數據文件的名稱。然而,與plc知識的記憶如何安排和利用,是至關重要的。而且,它關系到I / O體系是壹個先決條件及解釋用戶程序、數據存儲、任何在線互動控制器。
In this chapter, we will examine the organization and structure of the PLC memory, the various memory types and the applications to which they are best suited, and finally, memory addressing and its mapping to the I/O system.
在這壹章中,我們將研究組織和結構的可編程序控制器(PLC)記憶,各種類型的應用程序,記憶最適合他們,最後,內存尋址,其映射到I / O體系。
The most distinguishing feature of the programmable controller is its programmability. This feature makes it flexible with respect to the types of applications to which it can be applied, as well to the ultimate tailoring or changes typically made during design, installation, or expansion of a particular application. Such changes are made to the PLC’s application memory using the PLC programming device.
最有特色的是它的可編程控制器可編程。這種特性使它靈活的類型的應用程序,它可以應用,以及最終的剪裁和變化,通常在設計、安裝、或擴展壹個應用程序。這樣的改變可編程序控制器(PLC)的應用程序存儲器采用PLC編程設備。
The application memory is that part of the programmable controller’s central processing unit that provides storage for all user-generated programs and data. Application memory is typically installed on the processor module or on one or more modular slot-mounted cards installed in the CPU rack.
這個應用程序存儲器的那部分可編程序控制器的中央處理器,存儲器提供所有由程序和數據。記憶是典型的應用程序安裝在處理模塊或在壹個或多個模塊slot-mounted卡安裝在中央處理器的架子上。
The application memory consists of two basic sections, the data storage area and the application program area. The data table stores various types of data required by the control program and in some cases by the CPU. The application program area is employed by the system programmer for implementing the control program. In this area are stored the step-by-step instructions for controlling the sequence of operations for a particular machine or process. The following sections examine various application memory types, storage capacity requirements, storage of various data types, and addressing schemes.
這個應用程序存儲器是由兩個基本部分,數據存儲區和應用程序。數據表店各種類型的數據所控制程序,在某些情況下,中央處理器。這個應用程序使用面積是由系統程序員實現控制程序。在這個地區是儲存在循序漸進的指示來控制操作序列為壹個特殊的機器或過程。下面的部分研究各種類型的應用程序存儲器的存儲容量需求、儲存、各種各樣的數據類型,以及解決方案。