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lucas
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樓主  發(fā)表于: 2019-09-10 18:51



如圖，怎么解釋SD10681 與SD10682 這2個(gè)信號？

開(kāi)放請求，是誰(shuí)請求誰(shuí)？


為什么用開(kāi)放請求信號 去關(guān)閉端口？




反而開(kāi)放請求信號為OFF時(shí)才能開(kāi)啟端口



難道是SD10681 是OFF時(shí)請求開(kāi)放，ON時(shí)關(guān)閉請求？
但是貌似又不是這么一回事：

[ 此帖被lucas在2019-09-11 16:28重新編輯 ]
tkggtdkjpl
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1樓  發(fā)表于: 2019-09-10 19:06
一個(gè)是自己的狀態(tài)，一個(gè)是對方的狀態(tài)
因為PLC要么做服務(wù)器要么做客戶(hù)端
自動(dòng)化單機，生產(chǎn)線(xiàn)，項目編程調試！

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