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PLC企業(yè)資訊
    A06B-0314-B041#7075
    發(fā)布者:gw0002  發(fā)布時(shí)間:2018-09-04 09:22:53

    A06B-0314-B041#7075

    A06B-0314-B041#7075

    A06B-0314-B041#7075

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    繼電器電路圖是一個(gè)純粹的硬件電路圖,將它改為plc控制時(shí),需要用plc的外部接線圖和梯形圖來等效繼電器電路圖,其具體方法和步驟如下:

    (1)了解和熟悉被控設(shè)備的工作原理、工藝過程和機(jī)械的動(dòng)作情況,根據(jù)繼電器電路圖分析和掌握控制系統(tǒng)的工作原理。

    (2)確定plc的輸人信號(hào)和輸出負(fù)載。繼電器電路圖中的交流接觸器和電磁閥等執(zhí)行機(jī)構(gòu)如果用plc的輸出位來控制,它們的線圈在plc的輸出端。按鈕、操作開關(guān)和行程開關(guān)、接近開關(guān)等提供plc的數(shù)字量輸人信號(hào)繼電器。電路圖中的中間繼電器和時(shí)間繼電器的功能用plc內(nèi)部的存儲(chǔ)器位和定時(shí)器來完成,它們與plc的輸人位、輸出位無關(guān)。

    (3)確定與繼電器電路圖中的中間、時(shí)間繼電器對(duì)應(yīng)的梯形圖中的存儲(chǔ)器和定時(shí)器、計(jì)數(shù)器的地址,輸入輸出元件與梯形圖元件的對(duì)應(yīng)關(guān)系。

    (4)根據(jù)上述的對(duì)應(yīng)關(guān)系畫出梯形圖。

    2.2 梯形圖設(shè)計(jì)注意事項(xiàng)

      根據(jù)繼電器電路圖設(shè)計(jì)plc的外部接線圖和梯形圖時(shí)應(yīng)注意以下問題:(1)應(yīng)遵守梯形圖語言中的語法規(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。

    (2)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)這意味著成本的節(jié)約,但是這往往會(huì)使某些線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,并不是特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,只是在輸人程序時(shí)需要多花一點(diǎn)時(shí)間。

    (3)盡量減少plc的輸人和輸出點(diǎn)。plc的價(jià)格與點(diǎn)數(shù)有關(guān),因此輸人、輸出信號(hào)的點(diǎn)數(shù)是降低硬件費(fèi)用的主要措施。

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