描述
??? 根據(jù)繼電器電路圖設(shè)計(jì)PLC的外部接線(xiàn)圖和梯形圖時(shí)應(yīng)注意以下問(wèn)題。
●應(yīng)遵守梯形圖語(yǔ)言中的語(yǔ)法規(guī)定。由于工作原理不同，梯形圖不能照搬繼電器電路中的某些處理方法。例如在繼電器電路中，觸點(diǎn)可以放在線(xiàn)圈的兩側(cè)，但是在梯形圖中，線(xiàn)圈必須放在電路的最右邊。
●適當(dāng)?shù)姆蛛x繼電器電路圖中的某些電路。設(shè)計(jì)繼電器電路圖時(shí)的一個(gè)基本原則是盡量減少圖中使用的觸點(diǎn)的個(gè)數(shù)，因?yàn)檫@意味著成本的節(jié)約，但是這往往會(huì)使某些線(xiàn)圈的控制電路交織在一起。在設(shè)計(jì)梯形圖時(shí)首要的問(wèn)題是設(shè)計(jì)的思路要清楚，設(shè)計(jì)出的梯形圖容易閱讀和理解，并不是告別在意是否多用幾個(gè)觸點(diǎn)，因?yàn)檫@不會(huì)增加硬件的成本，只是在輸入程序時(shí)需要多花一點(diǎn)時(shí)間。
●盡量減少PLC的輸入和輸出點(diǎn)。PLC的價(jià)格與I/O點(diǎn)數(shù)有關(guān)，因此輸入、輸出信號(hào)的點(diǎn)數(shù)是降低硬件費(fèi)用的主要措施。在PLC的外部輸入電路中，各輸入端可以接常開(kāi)點(diǎn)或是常閉點(diǎn)，也可以接觸點(diǎn)組成的串并聯(lián)電路。PLC不能識(shí)別外部電路的結(jié)構(gòu)和觸點(diǎn)類(lèi)型，只能識(shí)別外部電路的通斷。
●時(shí)間繼電器的處理。時(shí)間繼電器除了有延時(shí)動(dòng)作的觸點(diǎn)外，還有在線(xiàn)圈通電瞬間接通的瞬動(dòng)觸點(diǎn)。在梯形圖中，可以在定時(shí)器的線(xiàn)圈兩端并聯(lián)儲(chǔ)器位的線(xiàn)圈，它的觸點(diǎn)相當(dāng)于定時(shí)器的瞬動(dòng)觸點(diǎn)。
●設(shè)置中間單元。在梯形圖中，若多個(gè)線(xiàn)圈都受某一觸點(diǎn)串并聯(lián)電路的控制。為了簡(jiǎn)化電路，在梯形圖中可以設(shè)置中間單元，即用該電路來(lái)控制某存儲(chǔ)位，在各線(xiàn)圈的控制電路中使用其常開(kāi)觸點(diǎn)。這種中間元件類(lèi)似于繼電器電路中的中間繼電器。
●設(shè)立外部互鎖電路。控制異步電動(dòng)機(jī)正以轉(zhuǎn)的交流接觸器如果同時(shí)動(dòng)作，將會(huì)造成三相電源短路。為了防止出現(xiàn)這樣的事故，應(yīng)在PLC外部設(shè)置硬件互鎖電路。
●外部負(fù)載的額定電壓。PLC雙向晶閘管輸出模塊一般只能驅(qū)動(dòng)額定電壓AC 220V的負(fù)載，如果系統(tǒng)原來(lái)的交流接觸器的線(xiàn)圈電壓為380V，應(yīng)換成220V的線(xiàn)圈，或是設(shè)置外部中間繼電器。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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