ST2*D S9611AJ-0 S9121AQ-0
7MBR100SD060
COMPAX-M 0500M
如果能限制偶發(fā)性故障的發(fā)生條件，如果能使PLC在惡劣環(huán)境中不受影響或能把影響的后果限制在小范圍，使PLC在惡劣條件消失后自動(dòng)恢復(fù)正常，這樣就能提高平均故障間隔時(shí)間；如果能在PLC上增加一些診斷措施和適當(dāng)?shù)谋Ｗo(hù)手段，在性故障出現(xiàn)時(shí)，能很快查出故障發(fā)生點(diǎn)，并將故障限制在局部，就能降低PLC的平均修復(fù)時(shí)間。為此，各PLC的生產(chǎn)廠商在硬件和軟件方面采取了多種措施，使PLC除了本身具有較強(qiáng)的自診斷能力，能及時(shí)給出出錯(cuò)信息，停止運(yùn)行等待修復(fù)外，還使PLC具有了很強(qiáng)的抗干擾能力。
2.通用性強(qiáng)，控制程序可變，使用方便
1.開(kāi)關(guān)量邏輯控制
工業(yè)生產(chǎn)對(duì)控制設(shè)備的可靠性要求：
系統(tǒng)管理程序主要控制PLC的運(yùn)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(jī)器語(yǔ)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(zhǎng)期保存的重要數(shù)據(jù)，所以其存儲(chǔ)器采用ROM或EPROM。ROM是只讀存儲(chǔ)器，該存儲(chǔ)器只能讀出內(nèi)容，不能寫(xiě)入內(nèi)容，ROM具有非易失性，即電源斷開(kāi)后仍能保存已存儲(chǔ)的內(nèi)容。
EPEROM為可電擦除只讀存儲(chǔ)器，須用紫外線照射芯片上的透鏡窗口才能擦除已寫(xiě)入內(nèi)容，可電擦除可編程只讀存儲(chǔ)器還有E2PROM、FLASH等。

用戶程序存儲(chǔ)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(jī)讀寫(xiě)操作的隨機(jī)存取存儲(chǔ)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(jī)器。企業(yè)能夠處理TB甚至PB級(jí)數(shù)據(jù)，從而強(qiáng)化決策層管理，不斷發(fā)現(xiàn)新市場(chǎng)，優(yōu)化過(guò)程。對(duì)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(wèn)題，目前涌現(xiàn)出三大技術(shù)趨勢(shì)
通過(guò)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(zhǎng)期使用。
聯(lián)系人：李工銷售工程師
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