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樓主  發(fā)表于: 2008-11-18 10:20
1、通過(guò)在WinccFlex定義modbus點(diǎn),有0x000,1x000,3x000,4x000的點(diǎn),發(fā)現TP177B只支持4x000的地址,是否是這樣。

2、對于設定點(diǎn)如溫度,我在類(lèi)型定義了輸入輸出,發(fā)現能夠把值設定到PLC,但是觸摸屏顯示#####,檢測了一下通訊數據,PLC返回正常,請問(wèn)這是什么原因?
已開(kāi)始,我以為是RS422和RS485的關(guān)系沒(méi)有設置對,可能是走的RS422方式,所以我看不到讀取數據。經(jīng)過(guò)查看,我在通訊連接設得是RS485,在觸摸屏的撥碼開(kāi)關(guān)設為

—————
口      口
   口口
—————



—————

口口口口
—————
均一樣,在RS485方式下PLC均能收到數據,不知道問(wèn)題出在哪里了。

3、對觸摸屏后的撥碼開(kāi)關(guān)疑問(wèn)?

觸摸屏后的撥碼開(kāi)關(guān)文字顯示:
—————
口口口口
   
************
PPI/MPI/DP
—————



—————
口      口
   口口
—————
RS422/RS485


是否是這意思:
—————
口口口口
 
PPI/MPI/DP
—————撥碼表示以PPI/MPI/DP方式通訊

—————
口      口
   口口
RS422/RS485
—————撥碼表示RS422或RS485方式,具體走RS422還是RS485通過(guò)組態(tài)軟件的通訊項選擇

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