描述
此工程中程序的難點(diǎn)主要在于數(shù)據(jù)的處理上。在切紙機(jī)工作過程中除手動(dòng)讓進(jìn)給定位機(jī)構(gòu)前進(jìn)后退外,還要實(shí)現(xiàn)等分裁切功能和指定具體位置定位功能,并且hmi上還要即時(shí)顯示定位機(jī)構(gòu)的當(dāng)前位置。我們?yōu)榱撕喕绦蛑械挠?jì)算,采用了兩個(gè)高速計(jì)數(shù)器c235和c236。c236通過計(jì)算前進(jìn)后退的脈沖數(shù),再進(jìn)行換算后用于顯示進(jìn)給機(jī)構(gòu)的當(dāng)前位置;c235用于進(jìn)行精確定位。定位過程是這樣的,每次進(jìn)給機(jī)構(gòu)需要定位工作時(shí),通過計(jì)算把需要的脈沖數(shù)送到c235,不論進(jìn)給機(jī)構(gòu)前進(jìn)還是后退c235進(jìn)行減計(jì)數(shù),同時(shí)對(duì)c235中的數(shù)值進(jìn)行比較,根據(jù)比較結(jié)果驅(qū)動(dòng)相應(yīng)的輸出點(diǎn)對(duì)變頻器進(jìn)行輸出頻率的控制,實(shí)現(xiàn)接近設(shè)定值時(shí)進(jìn)給速度變慢,從而達(dá)到精確定位。因?yàn)槿魏蜗到y(tǒng)都有慣性和時(shí)間上的遲滯,所以變頻器停止輸出的時(shí)間并不是c235中的計(jì)數(shù)值減小到0時(shí),而是讓c235和一個(gè)數(shù)據(jù)寄存器d130比較,當(dāng)c235中的值減小到d130中的設(shè)定值時(shí)plc控制變頻器停止輸出。d130的值可通過人機(jī)界面進(jìn)行修改和設(shè)定,在調(diào)試時(shí)通過修改這個(gè)值,以達(dá)到定位準(zhǔn)確的目的。
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