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    ExpressCard-GPIB現(xiàn)貨 in stock! 歡迎來電咨詢~??!

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    今天給我們說一個西門子事例——西門子S7-200SMART PLC怎樣實(shí)現(xiàn)兩燈交替閃耀

      我們先來看看這個事例的具體要求:

      運(yùn)用定時(shí)器Q0.0和Q0.1,當(dāng)按下發(fā)動按鈕時(shí)Q0.0亮,1秒后Q0.0滅,同時(shí)Q0.1亮,再過兩秒后Q0.1滅。以此循環(huán),直到按下中止按鈕,Q0.0和Q0.1全滅

      首要畫時(shí)序圖。再用定時(shí)器加比較的辦法會把很多雜亂的東西簡單化

      時(shí)序圖便是表示地址或變量根據(jù)時(shí)刻的改變而改變的圖形

      整個占用的時(shí)刻為3秒,需要用到100毫秒定時(shí)器

      設(shè):定時(shí)器的當(dāng)時(shí)值為X,0≦X﹤10的時(shí)候,Q0.0亮;當(dāng)10≦X﹤30時(shí),Q0.1亮。

      接下來便是循環(huán)的問題,循環(huán)便是用最后一個狀況作為第一個狀況的發(fā)動條件。

      定時(shí)器PT值為3秒(數(shù)值計(jì)作30),運(yùn)用TNO接通延時(shí)定時(shí)器,當(dāng)當(dāng)時(shí)值=設(shè)定值,狀況輸出為1時(shí),即定時(shí)器狀況位T37=1時(shí),就去復(fù)位定時(shí)器,再從0開始,這個便是自復(fù)位,便是自己復(fù)位自己,到了3秒就從0開始。

      最后整理下編寫程序的思路:

      1、 啟停操控——輸出發(fā)動標(biāo)志位,輸出為1,并保持(自鎖)

      2、 定時(shí)器操控——用發(fā)動標(biāo)志位去接通定時(shí)器,讓其作業(yè)

      3、 比較——0-1秒Q0.0輸出,1-3秒Q0.1輸出

      此外還有第二種辦法哦,會運(yùn)用到震蕩電路(閃耀電路)以及兩個定時(shí)器交替操控,一個操控接通時(shí)刻,一個操控?cái)嚅_時(shí)刻。
     

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