140DDI35310C Quantum

140DDI35310C

1、系統程序存儲器

系統程序存儲器用來存放由可編程控制器生產廠家編寫的系統程序，并固化在ROM內，用戶不能直接更改。系統程序質量的好壞，很大程度上決定了PLC的性能。

其內容主要包括三部分：第一部分為系統管理程序，它主要控制可編程控制器的運行，使整個可編程控制器按部就班地工作，第二部分為用戶指令解釋程序，通過用戶指令解釋程序，將可編程控制器的編程語言變為機器語言指令，再由CPU執行這些指令；第三部分為標準程序模塊與系統調用程序。

2、用戶程序存儲器

根據控制要求而編制的應用程序稱為用戶程序。用戶程序存儲器用來存放用戶針對具體控制任務，用規定的可編程控制器編程語言編寫的各種用戶程序。

目前較先進的可編程控制器采用可隨時讀寫的快閃存儲器作為用戶程序存儲器，快閃存儲器不需后備電池，掉電視數據也不會丟失。

3、工作數據存儲器

工作數據存儲器用來存儲工作數據，既用戶程序中使用的ON/OFF狀態、數值數據等。在工作數據區中開辟有元件映像寄存器和數據表。其中元件映像寄存器用來存儲開關量、輸出狀態以及定時器、計數器、輔助繼電器等內部器件的ON/OFF狀態。數據表用來存放各種數據，它存儲用戶程序執行時的某些可變參數值及A/D轉換得到的數字量和數字運算的結果等。

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