PLC方案的設(shè)計(jì)要點(diǎn)
(1) 設(shè)置濾波
在PLC中一般都在輸入輸出接口處設(shè)置π形濾波器,它不僅可濾除來自外界的高頻干擾,而且還可減少內(nèi)部模塊之間信號(hào)的相互干擾;
(2) 設(shè)有隔離
在PLC系統(tǒng)中CPU和各I/O回路(主要指數(shù)字口)幾乎都設(shè)有光耦合器作隔離,以防止干擾或可能損壞CPU等;
(3) 設(shè)置屏蔽
屏蔽有兩類:一類是對(duì)變壓器采取磁場(chǎng)和電場(chǎng)的雙重屏蔽,這時(shí)要用既導(dǎo)磁又導(dǎo)電的材料作為屏蔽層;另一類是對(duì)CPU和編程器等模塊僅作電磁場(chǎng)的屏蔽,此時(shí)可用導(dǎo)電的金屬材料作屏蔽層;
(4) 采用模塊式結(jié)構(gòu)
PLC通常采用積木式結(jié)構(gòu),這便于用戶檢修和更換模板,同時(shí)在各模板上都設(shè)有故障檢測(cè)電路,并用相應(yīng)的指示器標(biāo)志它的狀態(tài),使用戶能迅速確定故障的位置;
(5) 設(shè)有聯(lián)鎖功能
PLC中個(gè)各輸出通道之間設(shè)有聯(lián)鎖功能。以防止各被控對(duì)象之間誤動(dòng)作可能造成的事故;
(6) 設(shè)置環(huán)境檢測(cè)和診斷電路
這部分電路負(fù)責(zé)對(duì)PLC的運(yùn)行環(huán)境(例如電網(wǎng)電壓、工作溫度、環(huán)境的濕度等)進(jìn)行檢測(cè),同時(shí)也完成對(duì)PLC中各模塊工作狀態(tài)的監(jiān)測(cè)。這部分電路往往是與軟件相配合工作的,以實(shí)現(xiàn)故障自動(dòng)診斷和預(yù)報(bào);
(7) 設(shè)置Watchdog電路
PLC中的這種電路是專門監(jiān)視PLC運(yùn)行進(jìn)程是否按預(yù)定的順序進(jìn)行,如果PLC中發(fā)生故障或用戶程序區(qū)受損,則因CPU不能按預(yù)定順序(預(yù)定時(shí)間間隔)工作而報(bào)警;
(8) PLC的輸入、輸出控制簡(jiǎn)單
PLC是以掃描方式進(jìn)行工作的,即PLC對(duì)信號(hào)的輸入、數(shù)據(jù)的處理和控制信號(hào)的輸出,分別在一個(gè)掃描周期內(nèi)的不同時(shí)間間隔里,以批處理方式進(jìn)行,這不僅使用戶編程簡(jiǎn)單、不易出錯(cuò),而且也使PLC的工作不易受到外界干擾的影響;同時(shí)PLC所處理的數(shù)據(jù)比較穩(wěn)定,從而減少了處理中的錯(cuò)誤;另外,PLC的輸入、輸出的控制較簡(jiǎn)單,不容易產(chǎn)生由于時(shí)序不合適而造成的問題。
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