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OPC客户程序(VB篇——同步)

王朝vb·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

建立如下窗体:

引用如下:

代码如下:

Option Explicit

Dim WithEvents ServerObj As OPCServer

Dim WithEvents GroupObj As OPCGroup

Dim ItemObj As OPCItem

Private Sub Command_Start_Click()

Dim OutText As String

On Error GoTo ErrorHandler

Command_Start.Enabled = False

Command_Read.Enabled = True

Command_Write.Enabled = True

Command_Exit.Enabled = True

OutText = "连接OPC服务器"

Set ServerObj = New OPCServer

ServerObj.Connect ("XXXSERVER")'XXXSERVER为某OPC服务器名称

OutText = "添加组"

Set GroupObj = ServerObj.OPCGroups.Add("Group")

OutText = "Adding an Item to the group"

Set ItemObj = GroupObj.OPCItems.AddItem("XXXITEM", 1)'XXXITEM为添加的ITEM名称

Exit Sub

ErrorHandler: '如果出现异常,则报出错误。

MsgBox Err.Description + Chr(13) + _

OutText, vbCritical, "ERROR"

End Sub

Private Sub Command_Read_Click()'同步读

Dim OutText As String

Dim myValue As Variant

Dim myQuality As Variant

Dim myTimeStamp As Variant

On Error GoTo ErrorHandler

OutText = "读ITEM值"

ItemObj.Read OPCDevice, myValue, myQuality, myTimeStamp

Edit_ReadVal = myValue

Edit_ReadQu = GetQualityText(myQuality)

Edit_ReadTS = myTimeStamp

Exit Sub

ErrorHandler:

MsgBox Err.Description + Chr(13) + _

OutText, vbCritical, "ERROR"

End Sub

Private Sub Command_Write_Click()'同步写

Dim OutText As String

Dim Serverhandles(1) As Long

Dim MyValues(1) As Variant

Dim MyErrors() As Long

OutText = "写值"

On Error GoTo ErrorHandler

Serverhandles(1) = ItemObj.ServerHandle

MyValues(1) = Edit_WriteVal

GroupObj.SyncWrite 1, Serverhandles, MyValues, MyErrors

Edit_WriteRes = ServerObj.GetErrorString(MyErrors(1))

Exit Sub

ErrorHandler:

MsgBox Err.Description + Chr(13) + _

OutText, vbCritical, "ERROR"

End Sub

Private Sub Command_Exit_Click()'停止,删除ITEM,删除GROUP,删除SERVER。

Dim OutText As String

On Error GoTo ErrorHandler

Command_Start.Enabled = True

Command_Read.Enabled = False

Command_Write.Enabled = False

Command_Exit.Enabled = False

OutText = "删除对象"

Set ItemObj = Nothing

ServerObj.OPCGroups.RemoveAll

Set GroupObj = Nothing

ServerObj.Disconnect

Set ServerObj = Nothing

Exit Sub

ErrorHandler:

MsgBox Err.Description + Chr(13) + _

OutText, vbCritical, "ERROR"

End Sub

Private Function GetQualityText(Quality) As String

Select Case Quality

Case 0: GetQualityText = "BAD"

Case 64: GetQualityText = "UNCERTAIN"

Case 192: GetQualityText = "GOOD"

Case 8: GetQualityText = "NOT_CONNECTED"

Case 13: GetQualityText = "DEVICE_FAILURE"

Case 16: GetQualityText = "SENSOR_FAILURE"

Case 20: GetQualityText = "LAST_KNOWN"

Case 24: GetQualityText = "COMM_FAILURE"

Case 28: GetQualityText = "OUT_OF_SERVICE"

Case 132: GetQualityText = "LAST_USABLE"

Case 144: GetQualityText = "SENSOR_CAL"

Case 148: GetQualityText = "EGU_EXCEEDED"

Case 152: GetQualityText = "SUB_NORMAL"

Case 216: GetQualityText = "LOCAL_OVERRIDE"

Case Else: GetQualityText = "UNKNOWN ERROR"

End Select

End Function

 
 
 
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