5SDA16F3806
PLC是專(zhuān)為工業(yè)控制而開(kāi)發(fā)的裝置,其主要使用者是工廠廣大電氣技術(shù)人員,為了適應(yīng)他們的傳統(tǒng)習(xí)慣和掌握能力,通常PLC不采用微機(jī)的編程語(yǔ)言,而常常采用面向控制過(guò)程、面向問(wèn)題的“自然語(yǔ)言”編程。電工委員會(huì)(IEC)1994年5月公布的IEC1131-3(可編程控制器語(yǔ)言標(biāo)準(zhǔn))詳細(xì)地說(shuō)明了句法、語(yǔ)義和下述5種編程語(yǔ)言:功能表圖(sequential function chart)、梯形圖(Ladder diagram)、功能塊圖(Function black diagram)、指令表(Instruction list)、結(jié)構(gòu)文本(structured text)。梯形圖和功能塊圖為圖形語(yǔ)言,指令表和結(jié)構(gòu)文本為文字語(yǔ)言,功能表圖是一種結(jié)構(gòu)塊控制流程圖。
梯形圖是使用得zui多的圖形編程語(yǔ)言,被稱(chēng)為PLC的*編程語(yǔ)言。梯形圖與電器控制系統(tǒng)的電路圖很相似,具有直觀易懂的優(yōu)點(diǎn),很容易被工廠電氣人員掌握,特別適用于開(kāi)關(guān)量邏輯控制。梯形圖常被稱(chēng)為電路或程序,梯形圖的設(shè)計(jì)稱(chēng)為編程。
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