1756-ESMNRM+++1756-ESMNRM

1756-ESMNRM+++1756-ESMNRM數(shù)據(jù)寫入PLC軟元件 
程序首先通過VISA寫入節(jié)點(diǎn)發(fā)送命令字符"1"對(duì)相應(yīng)的軟元件進(jìn)行寫入操作，然后VISA讀取節(jié)點(diǎn)獲得PLC返回的應(yīng)答幀，若寫入正確，PLC應(yīng)答"ACK"；若寫入錯(cuò)誤，PLC應(yīng)答"NAK"。將寫入數(shù)據(jù)傳送至PLC軟元件所對(duì)應(yīng)的地址，即可對(duì)軟元件的任意位進(jìn)行實(shí)時(shí)操作。數(shù)據(jù)寫入PLC的程序框圖如圖5所示。 
【公　司】： 廈門泰尼電氣有限公司
【主　營(yíng)】： AB、GE、施耐德等各類PLC產(chǎn)品
【價(jià)　格】： 電議
【發(fā)布人】： 張亮
【電  話】： 18030028083
【所在地】： 福建 - 廈門
【座　機(jī)】： 0592-6809819
【來　源】： 供應(yīng)信息 > 電工、電氣 > PLC
【Q　  Q】： 2314094943

 
圖5 數(shù)據(jù)寫入PLC的程序框圖 
3.5 關(guān)閉串口 
通信結(jié)束后，需使用VISA關(guān)閉節(jié)點(diǎn)關(guān)閉串口設(shè)備，否則程序會(huì)一直占用串口資源，導(dǎo)致其他程序無法訪問。

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