PLC与PC机通讯的VB源程序 PLC与PC机通讯的VB源程序大体如下:如下程序采用的是FX232BD通讯模块,协议就是FX通讯协议。 ‘强制PLC为RUN Private Sub command1_Click() Dim dat As String commli.OutBufferCount = 0 commli.InBufferCount = 0 dat = "01FFRR0" commli.Output = Chr$(5) + dat + SumChk(dat)
End Sub ‘强制PLC为STOP Private Sub command2_Click() Dim dat As String commli.OutBufferCount = 0 commli.InBufferCount = 0 dat = "01FFRS0" commli.Output = Chr$(5) + dat + SumChk(dat)
End Sub ‘强制Y0为1 Private Sub command3_Click() Dim dat As String commli.OutBufferCount = 0 commli.InBufferCount = 0 commli.Output = “01FFBW0Y001011”
End Sub ‘强制Y0为0 Private Sub command3_Click() Dim dat As String commli.OutBufferCount = 0 commli.InBufferCount = 0 commli.Output = “01FFBW0Y001010”
End Sub
'设置电脑通信参数 Private Sub Commlis()
If commli.PortOpen = True Then commli.PortOpen = False End If If Not commli.PortOpen Then commli.CommPort = 1 '通信口 commli.Settings = "9600,N,8,1" commli.Handshaking = 0 commli.InputLen = 0 commli.OutBufferCount = 0 commli.InBufferCount = 0 commli.PortOpen = True End If Exit Sub
End Sub Private Function SumChk(Dats$) As String Dim i& Dim CHK& For i = 1 To Len(Dats) CHK = CHK + Asc(Mid(Dats, i, 1)) Next i
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