點(diǎn)擊圖片查看大圖
4.編程簡(jiǎn)單，容易掌握
目前，大多數(shù)PLC仍采用繼電控制形式的“梯形圖編程方式”。既繼承了傳統(tǒng)控制線(xiàn)路的清晰直觀(guān)，又考慮到大多數(shù)工廠(chǎng)企業(yè)電氣技術(shù)人員的讀圖習(xí)慣及編程水平，所以非常容易接受和掌握。梯形圖語(yǔ)言的編程元件的符號(hào)和表達(dá)方式與繼電器控制電路原理圖相當(dāng)接近。通過(guò)閱讀PLC的用戶(hù)手冊(cè)或短期培訓(xùn)，電氣技術(shù)人員和技術(shù)工很快就能學(xué)會(huì)用梯形圖編制控制程序。同時(shí)還提供了功能圖、語(yǔ)句表等編程語(yǔ)言。
PLC在執(zhí)行梯形圖程序時(shí)，用解釋程序?qū)⑺g成匯編語(yǔ)言然后執(zhí)行（PLC內(nèi)部增加了解釋程序）。與直接執(zhí)行匯編語(yǔ)言編寫(xiě)的用戶(hù)程序相比，執(zhí)行梯形圖程序的時(shí)間要長(zhǎng)一些，但對(duì)于大多數(shù)機(jī)電控制設(shè)備來(lái)說(shuō)，是微不足道的，完全可以滿(mǎn)足控制要求
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