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三、控制功能的選擇30

西門子正在探索如何利用智能電網(wǎng)管理未來的分布式能源環(huán)境。與此同時，公司也在思考儲能、自主微電網(wǎng)和虛擬電廠等技術(shù)將如何為電網(wǎng)運營商和能源生產(chǎn)商帶來新機遇。30

正因如此，想要在以太網(wǎng)上進行實時通信的用戶必須部署擴展性技術(shù)，如應(yīng)用廣泛的Profinet標(biāo)準(zhǔn)。舉例來講，在機器中，這個標(biāo)準(zhǔn)通過向以太網(wǎng)添加實時數(shù)據(jù)傳輸能力，將傳感器、執(zhí)行機構(gòu)和驅(qū)動器等連接至中央控制器，從而實現(xiàn)包括精準(zhǔn)控制伺服驅(qū)動器的應(yīng)用。西門子Simatic控制器業(yè)務(wù)部門的系統(tǒng)管理負(fù)責(zé)人MatthiasG?rtner解釋道，“然而，要做到這一點，通常需要在連接設(shè)備內(nèi)加裝特殊硬件組件。不僅如此，各種實時工業(yè)以太網(wǎng)解決方案不能在同一個以太網(wǎng)上并行運行。”30

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(二)輸入輸出模塊的選擇30

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ohne
PS-M06D12S5-NJ1L
S22761-A88-N101
SMP-217
SMP-E211-A11
SMP-E230-A10
SMP-SYS-51C
SSM-BG41
YB560103-BD
簡單PLC的運算功能包括邏輯運算、計時和計數(shù)功能；普通PLC的運算功能還包括數(shù)據(jù)移位、比較等運算功能；較復(fù)雜運算功能有代數(shù)運算、數(shù)據(jù)傳送等；大型PLC中還有模擬量的PID運算和其他運算功能。隨著開放系統(tǒng)的出現(xiàn)，目前在PLC中都已具有通信功能，有些產(chǎn)品具有與下位機的通信，有些產(chǎn)品具有與同位機或上位機的通信，有些產(chǎn)品還具有與工廠或企業(yè)網(wǎng)進行數(shù)據(jù)通信的功能。設(shè)計選型時應(yīng)從實際應(yīng)用的要求出發(fā)，合理選用所需的運算功能。大多數(shù)應(yīng)用場合，只需要邏輯運算和計時計數(shù)功能，有些應(yīng)用需要數(shù)據(jù)傳送和比較，當(dāng)用于模擬量檢測和控制時，才使用代數(shù)運算，數(shù)值轉(zhuǎn)換和PID運算等。要顯示數(shù)據(jù)時需要譯碼和編碼等運算。30