描述
與外部設(shè)備的數(shù)據(jù)交換速度高速化。PLC的CPU模塊通過系統(tǒng)總線（一般做在基板的印刷電路上）與裝插在基板上的各種I/O模塊、特殊功能模塊、通信模塊等交換數(shù)據(jù)，裝插的模塊越多，CPU模塊與那些模塊之間的數(shù)據(jù)交換的時間就會增加。這種數(shù)據(jù)交換的時間的增加，在一定程度上會使PLC的掃描時間加長。因此，有必要采取以下措施使系統(tǒng)總線傳輸速度高速化：增加系統(tǒng)總線的帶寬使一次傳輸?shù)臄?shù)據(jù)量增多，例如三菱電機(jī)的小Q系列PLC，增加了系統(tǒng)總線的帶寬，使所傳輸?shù)臄?shù)據(jù)量是以前的2倍；在系統(tǒng)總線存取的方式上，采用連續(xù)成組傳送技術(shù)實現(xiàn)連續(xù)數(shù)據(jù)的高速批量傳送，大大縮短了存取每個字所需的時間；通過向與系統(tǒng)總線相連接的模塊實現(xiàn)全局傳送，即針對多個模塊同時傳送同一數(shù)據(jù)，有效地用活了系統(tǒng)總線。
編程設(shè)備服務(wù)處理的高速化。當(dāng)掃描時間為數(shù)十毫秒時，幾毫秒的編程工具和監(jiān)控設(shè)備的服務(wù)處理時間不會帶來什么問題。但是在執(zhí)行1毫秒以下的控制任務(wù)時，就有必要大大縮短這個時間。所采用的方法是以多CPU芯片并行處理的方式，由專門處理編程及監(jiān)控服務(wù)的微處理器芯片執(zhí)行這類處理，以減輕對執(zhí)行控制程序的CPU芯片的影響，讓它只管執(zhí)行順控和邏輯運(yùn)算。此外，為了提高服務(wù)處理的效率，縮短在現(xiàn)場讀寫程序的時間，以縮短操作時間，采用了高速的串行通信（最大的波特率為115.2Kbps）以及將UCB口（最大波特率達(dá)12Mbps）引入PLC的CPU模塊，從而實現(xiàn)與編程工具及監(jiān)控設(shè)備之間通信的高速化，并允許同時使用這兩個通信端口，由多人同時進(jìn)行編程和調(diào)試。提高外部設(shè)備的響應(yīng)速度。在PLC內(nèi)部實現(xiàn)高速化的同時，還要提高外部設(shè)備的響應(yīng)速度，才能整體提高整個系統(tǒng)的性能，為此，在縮短I/O模塊的輸入輸出響應(yīng)時間，提高模擬量輸入輸出模塊的模-數(shù)和數(shù)-模轉(zhuǎn)換時間，下了不少工夫，以求得系統(tǒng)整體的控制速度達(dá)到毫秒級以下。例如，在晶體管輸出模塊的輸出電路中選用高性能的晶體管，使響應(yīng)時間加快50%；在直流輸入模塊中，其輸入的時間常數(shù)回路采用專用ASIC芯片，可通過編程軟件選擇輸入模塊的響應(yīng)時間為1/5/10/20/70毫秒；為提高模擬量模塊的轉(zhuǎn)換時間，采用A/D或D/A的專用芯片，是轉(zhuǎn)換速度為原先的1/2—1/6。另外也通過開發(fā)專用的處理器和通信專用ASIC，縮短通信網(wǎng)絡(luò)模塊之間的通信鏈接的循環(huán)時間。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。
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