描述
CC-TDIL01
PLC是一種監(jiān)控裝置,為了監(jiān)視及控制各項(xiàng)機(jī)電等設(shè)備,當(dāng)然必須與那些設(shè)備有相互溝通的方式.在這些機(jī)電設(shè)備的世界里,人類(lèi)發(fā)明了各種形式的訊號(hào),以作為它們之間的溝通媒介.目前來(lái)說(shuō),人們研發(fā)出來(lái)的各種偵測(cè)如:溫度,濕度,壓力等自然現(xiàn)象的偵測(cè)元件,都是將所測(cè)得的數(shù)據(jù)轉(zhuǎn)換為線性對(duì)應(yīng)的電流信號(hào),通常是4~20mA.PLC接受這樣的信號(hào),就可依據(jù)電流的大小而知道偵測(cè)器偵得的目前狀況.Pulse(脈沖)信號(hào)是一種形式的接點(diǎn)信號(hào).它的意思是每”達(dá)到條件”時(shí),接點(diǎn)會(huì)閉合一次.例如:某個(gè)轉(zhuǎn)輪式的流量計(jì),可能被設(shè)計(jì)成–當(dāng)它計(jì)算出水流累計(jì)量達(dá)到一度時(shí),就將輸出接點(diǎn)閉合一次.至于所謂的RS232訊號(hào),乃是指一種”通訊”的方式(RS232是一種電氣規(guī)格).以上所提的各種信號(hào)都是電氣形式的訊號(hào).而且每個(gè)信號(hào)都需要獨(dú)立的線路來(lái)作傳遞.通訊的方式,則可以把它當(dāng)作設(shè)備用”交談”的方式來(lái)做溝通.
隨著電子技術(shù)的發(fā)展,電子產(chǎn)品的集成化程度越來(lái)越高,結(jié)構(gòu)越來(lái)越細(xì)微,工序越來(lái)越多,制造工藝越來(lái)越復(fù)雜,這樣在制造過(guò)程中會(huì)產(chǎn)生潛伏缺陷。對(duì)一個(gè)好的電子產(chǎn)品,不但要求有較高的性能指標(biāo),而且還要有較高的穩(wěn)定性。電子產(chǎn)品的穩(wěn)定性取決于設(shè)計(jì)的合理性、元器件性能以及整機(jī)制造工藝等因素。目前,國(guó)內(nèi)外普遍采用高溫老化工藝來(lái)提高電子產(chǎn)品的穩(wěn)定性和可靠性,通過(guò)高溫老化可以使元器件的缺陷、焊接和裝配等生產(chǎn)過(guò)程中存在的隱患提前暴露,保證出廠的產(chǎn)品能經(jīng)得起時(shí)間的考驗(yàn)。
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