#無輸入口

msg.payload
#   1：DI檢測到高電平      0：DI檢測到低電平

獲取全局變量：

global.get("DI_1")
#注意1:流程內(nèi)至少存在一個開關(guān)量輸入節(jié)點，才會使能開關(guān)量輸入的全局變量，才能讀取
#注意2:如果已經(jīng)初始化了全局變量，重啟網(wǎng)關(guān)才能刪除全局變量

全局變量可以很直觀的在右側(cè)全局變量窗口查看：

DI檢測&讀取全局變量

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