Compax3
6ES5350-3KA41
③設(shè)置警戒時鐘WDT(看門狗)——如果程序每循環(huán)執(zhí)行時間超過了WDT規(guī)定的時間,預(yù)示了程序進入死循環(huán),立即報警。
根據(jù)PLC所具有的功能不同,可將PLC分為低檔、中檔、三類。
由于PLC采用了軟件來取代繼電器控制系統(tǒng)中大量的中間繼電器、時間繼電器、計數(shù)器等器件,控制柜的設(shè)計安裝接線工作量大為減少。同時,PLC的用戶程序可以在實驗室模擬調(diào)試,更減少了現(xiàn)場的調(diào)試工作量。并且,由于PLC的低故障率及很強的監(jiān)視功能,模塊化等等,使維修也極為方便。
(1)低檔PLC具有邏輯運算、定時、計數(shù)、移位以及自診斷、監(jiān)控等基本功能,還可有少量模擬量輸入/輸出、算術(shù)運算、數(shù)據(jù)傳送和比較、通信等功能。主要用于邏輯控制、順序控制或少量模擬量控制的單機控制系統(tǒng)。
系統(tǒng)管理程序主要控制PLC的運行,使PLC按正確的次序工作;用戶指令解釋程序?qū)LC的用戶指令轉(zhuǎn)換為機器語言指令,傳輸?shù)紺PU內(nèi)執(zhí)行;功能程序與系統(tǒng)程序調(diào)用則負(fù)責(zé)調(diào)用不同的功能子程序及其管理程序。
系統(tǒng)程序?qū)儆谛栝L期保存的重要數(shù)據(jù),所以其存儲器采用ROM或EPROM。ROM是只讀存儲器,該存儲器只能讀出內(nèi)容,不能寫入內(nèi)容,ROM具有非易失性,即電源斷開后仍能保存已存儲的內(nèi)容。
EPEROM為可電擦除只讀存儲器,須用紫外線照射芯片上的透鏡窗口才能擦除已寫入內(nèi)容,可電擦除可編程只讀存儲器還有E2PROM、FLASH等。

用戶程序存儲器用于存放用戶載入的PLC應(yīng)用程序,載入初期的用戶程序因需修改與調(diào)試,所以稱為用戶調(diào)試程序,存放在可以隨機讀寫操作的隨機存取存儲器RAM內(nèi)以方便用戶修改與調(diào)試。
按照摩爾定律的穩(wěn)定發(fā)展,使得我們擁有了海量處理能力的機器。企業(yè)能夠處理TB甚至PB級數(shù)據(jù),從而強化決策層管理,不斷發(fā)現(xiàn)新市場,優(yōu)化過程。對于制造商而言,***的挑戰(zhàn)是收集數(shù)據(jù)并根據(jù)數(shù)據(jù)采取措施。為解決這一問題,目前涌現(xiàn)出三大技術(shù)趨勢
通過修改與調(diào)試后的程序稱為用戶執(zhí)行程序,由于不需要再作修改與調(diào)試,所以用戶執(zhí)行程序就被固化到EPROM內(nèi)長期使用。
聯(lián)系人:李工銷售工程師
聯(lián)系電話:0591-22983782?????? 13696852881
聯(lián)系QQ:1273632994
公司傳真:0591-22989937
公司全稱:
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福建省福州市閩侯西江濱大道77號正榮潤園1號樓1205室
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