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產品簡介
USB-485/4
USB-485/4
產品價格:¥320
上架日期:2019-12-10 12:56:30
產地:USB-485/4
發(fā)貨地:采集卡 工控機板卡
供應數(shù)量:不限
最少起訂:1個
瀏覽量:162
資料下載:暫無資料下載
其他下載:暫無相關下載
詳細說明

    USB-485/4現(xiàn)貨 in stock! 歡迎來電咨詢~!!

    USB-485/4,

    USB-485/4

    有福之州-福州聚福興供應進口工業(yè)控制系統(tǒng)成套備件:DCS PLC模塊卡件,底板機架機槽,CPU模塊,輸入輸出模塊,模擬量模塊,電源模塊,通訊模塊,工業(yè)交換機,觸摸屏人機界面顯示器,插頭連接器,連接電纜接插電纜,伺服控制器,電機馬達,伺服驅動器,驅動板電源板電路板,采集卡,影像卡,工控機,示教器,工業(yè)機器人配件..........
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    USB-485/4


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

      我們先來看看這個事例的具體要求:

      運用定時器Q0.0和Q0.1,當按下發(fā)動按鈕時Q0.0亮,1秒后Q0.0滅,同時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

      首要畫時序圖。再用定時器加比較的辦法會把很多雜亂的東西簡單化

      時序圖便是表示地址或變量根據(jù)時刻的改變而改變的圖形

      整個占用的時刻為3秒,需要用到100毫秒定時器

      設:定時器的當時值為X,0≦X﹤10的時候,Q0.0亮;當10≦X﹤30時,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。

      定時器PT值為3秒(數(shù)值計作30),運用TNO接通延時定時器,當當時值=設定值,狀況輸出為1時,即定時器狀況位T37=1時,就去復位定時器,再從0開始,這個便是自復位,便是自己復位自己,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)動標志位,輸出為1,并保持(自鎖)

      2、 定時器操控——用發(fā)動標志位去接通定時器,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,會運用到震蕩電路(閃耀電路)以及兩個定時器交替操控,一個操控接通時刻,一個操控斷開時刻。
     

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