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niningtt
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樓主  發(fā)表于: 2010-10-15 09:34
做了一個(gè)臺達B系列觸摸屏與儀表MODBUS通訊,沒(méi)有成功,現將設置及儀表說(shuō)明書(shū)部分附于下面,麻煩你幫我看看是哪里除了問(wèn)題。

1、儀表說(shuō)明書(shū)通訊部分 


2、創(chuàng )建工程時(shí)控制器選擇(modbus從站) 


3、通訊設置
屏通過(guò)232轉485連接到儀表(實(shí)驗證明能用,沒(méi)問(wèn)題),通訊參數設置如下圖,其中PLC站號設置中,地址撥碼開(kāi)關(guān)值為0。 


4、控制命令設置
臺達觸摸屏Modbus映射表是W40001對應$0嗎?是不是就是儀表設備地址的W0 


5、讀取儀表的值
現在向讀取的是儀表地址的w920的值, 


哪位高手幫忙指點(diǎn)迷津
只要你看了此貼我就謝謝你。!

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    xjjfs
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    1樓  發(fā)表于: 2010-10-16 21:39
    一定要確認儀表設備地址 ,有些可能是16位的。

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