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請問MX Component  使用vb 來寫，要用哪個指令抓取32位d值?
怎麼是都抓16位而已，求助~

指令的話，使用 【ReadDeviceBlock2】
但要特別處理，才能讀到。
詳細(xì)，請參考mx內(nèi)附的程式範(fàn)例。

祝好運(yùn)

好人作到底，給你完整的code
自己測試看看，有問題再討論

=====================================
Option Explicit
'/*****************************************************/
'/*撰寫者：李同在                                     */
'/*日期：2009/09/07 V1.0                              */
'/*用途：讀取三荾PLC的資料                            */
'/*****************************************************/
Dim bufferBit As udtBitInteger        '使用者自定型態(tài) for 32bit Integer
Dim bufferInteger As udtInteger
Public lRet As Long                   'PLC回傳值
Const MAX_SIZE_OF_ARRAY = 20          'Size of array for reading/writing 'Word' data to the PLC
'Data for reading/writing to the PLC
Private Type udtInteger
  iarrInteger(MAX_SIZE_OF_ARRAY - 1) As Integer
End Type
'資料位元
Private Type udtBitInteger
  l32Bit As Long
End Type

'/**************************************************************/
'/*功能：連續(xù)讀取32BIT PLC D值的資料                           */
'/*用法：Call Read32Bit("D0", "D2", "D4", "D6", "D8")          */
'/**************************************************************/
Public Function Read32Bit(ParamArray PLC_Data()) As String()
  Dim sRead32BitData() As String    '存放資料用
  Dim iCnt As Integer               '迴圈計(jì)算
 
  ReDim sRead32BitData(UBound(PLC_Data))
  For iCnt = LBound(PLC_Data) To UBound(PLC_Data)
    lRet = frmPLC.PLC.ReadDeviceBlock2(UCase(PLC_Data(iCnt)), CLng(2), bufferInteger.iarrInteger(0))
    LSet bufferBit = bufferInteger    '複製'bufferInteger'到 '32bit Integer'
    sRead32BitData(iCnt) = CStr(bufferBit.l32Bit)
  Next
  Read32Bit = sRead32BitData
End Function

你不是臺灣來的嗎？怎麼不在臺灣那邊發(fā)問？

你的CALL有問題，CALL回來的東西要放那裡？誰(程式)會知道？
當(dāng)然就錯誤了。

一樣，直接給你現(xiàn)成的CODE，有問題再討論
VB語法不懂的，請自行找資料了解。
================================================
'讀取sv位置資料
Public Sub ReadSVData(iSVAxis As Integer)
  Dim arrData As Variant
  Dim iCnt As Integer

  Select Case iSVAxis
    Case 1:
      arrData = Read32Bit("D1000", "D1002", "D1004", "D1006", "D1008", "D1010", "D1012")
      For iCnt = LBound(arrData) To UBound(arrData)
        lblAxis1Poistion(iCnt).Caption = arrData(iCnt)
      Next iCnt
    Case 2:
      arrData = Read32Bit("D1018", "D1020", "D1024", "D1026", "D1028", "D1030", "D1032")
      For iCnt = LBound(arrData) To UBound(arrData)
        lblAxis2Poistion(iCnt).Caption = arrData(iCnt)
      Next iCnt
    Case 3:
      arrData = Read32Bit("D1034", "D1036", "D1038", "D1040", "D1042", "D1044", "D1046", "D1048", "D1050")
      For iCnt = LBound(arrData) To UBound(arrData)
        lblAxis3Poistion(iCnt).Caption = arrData(iCnt)
      Next iCnt
    Case 4:
      arrData = Read32Bit("D1054", "D1056", "D1058", "D1060", "D1062", "D1064", "D1066", "D1070", "D1072", "D1074", "D1076", "D1078", "D1080")
      For iCnt = LBound(arrData) To UBound(arrData)
        lblAxis4Poistion(iCnt).Caption = Format(arrData(iCnt) / 100, "##00.00")
      Next iCnt
  End Select
End Sub

若問題解決了，煩請改一下標(biāo)題分類。