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l185024857
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樓主  發(fā)表于: 2017-05-30 12:38
圖片：
圖片：
現用s7-200PLC(CPU224XP)與一臺溫濕度傳感器通過(guò)MODBUS進(jìn)行通訊，讀取溫濕度值。傳感器說(shuō)明如下圖，按照說(shuō)明數據寄存器地址為ADD(十進(jìn)制2781）對應程序中的42782，但一直讀不到數據，請大蝦指教！用其它儀表試過(guò)，程序可以讀到，但就是這個(gè)溫濕度計不行
wuwm_1974
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1樓  發(fā)表于: 2017-08-02 16:00
ADD是address的意思，應該有自己的出廠(chǎng)設定地址，并且可以修改，不是你自己認為的42782。
讀取的地址是低字節04，那應該是40004的地址來(lái)讀取，長(cháng)度是1個(gè)字節（這個(gè)有點(diǎn)奇怪，一般是倆字節吧）。再試試看

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