IC693CPU323
IC693CPU323
IC693CPU323
5.2控制規模
控制規模代表PLC控制能力，看其能對多少輸入、輸出點及對多少路模擬進行控制。
控制規模與速度有關。因為規模大了，用戶程序也長，執行指令的速度不快，勢必延長PLC循環的時間，也必然會延長PLC對輸入信號的響應。為了避免這個情況，PLC的工作速度就要快。所以，大型PLC的工作速度總是比小的要快。
控制規模還與內存區的大小有關。規模大，用戶程序長，要求有更大的用戶存儲區。同時點數多，系統的存儲器輸入、輸出的信號區（輸入輸出繼電器區或稱輸入、輸出映射區）也大。這個區大，相應地內部器件（解釋見后）也要增多，這些都要求有更大的系統存儲區。
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