產品參數 |
品牌 | 西門子 |
產品特性 | 進口*** |
是否進口 | 否 |
加工定制 | 否 |
工作電壓 | 24VDCV |
輸出頻率 | 50kHz |
產品認證 | UL |
系列 | 6ES7 6ES5 |
可售賣地 | 全國 |
型號 | 6SN1118-0DG21-0AA1 | |
6SN1118-0DG21-0AA1 ;
6SN1118-0DG21-0AA1 ;
6SN1118-0DG21-0AA1
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5.2控制規模
控制規模代表PLC控制能力,看其能對輸入、輸出點及對路模擬進行控制。
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。
控制規模還與輸入、輸出電路數有關。如控制規模為1024點,那就得有1024條I/O電路。這些電路集成于I/O模塊中,而每個模塊有路的I/O點總是有數的。所以,規模大,所使用的模塊也多。
控制規模還與PLC指令系統有關。規模大的PLC指令條數多,指令的功能也強,才能應付對點數多的系統進行控制的需要。
控制規模是對PLC其它性能指標起著制約作用的指標;也是PLC劃分為微、小、中、大和特大型
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