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永恒14
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樓主  發(fā)表于: 2015-09-10 22:32
剛做了一個(gè)關(guān)于交通燈的PLC控制程序,選用 S7-200 SAMRT ST20的CPU，使用SMART 700  IE的觸摸屏顯示,
  VW0和VW10分別用來(lái)儲存南北和東西方向的時(shí)間,
按啟動(dòng)按鈕后,前60s VW0和VW10數據為0, 60s后顯示數據正常,很不解，還請各位老師幫忙分析原因

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