Siemens S7-200 PLC and Computer (Laptop) Communication with Visual Basic Express and Windows 7

Video about the results of the PLC and Computer (Laptop) communication


Architecture of PLC and Computer Communication:
Architecture of PLC and Computer Communication
Remarks of PLC and Computer Communication Architecture:
PLC:
1. Siemens S7-200 PLC with PPI Communication Port
PLC Cable:
2. PLC Cable:  USB to PPI (RS485) Adapter for Siemens S7-200
Computer:
3. Computer or Laptop
4. Windows 7 Operating System, I use Windows 7 64Bit
5. PLC Cable Driver for Windows 7
6. Visual Basic 2010 Express

A. Prepared of Hardware and software for PLC and Computer Communication
1. Siemens S7-200, CPU 226 CN
Siemens S7-200, CPU 226 CN

2. USB to PPI Adapter for Siemens S7-200
USB to PPI Adapter for Siemens S7-200


3. Download PLC Cable driver for windows 7, Click: CP210x_VCP_Win_XP_S2K3_Vista_7
   
4. Installation Siemens S7-200 PLC, PLC Cable and Laptop
Installation Siemens S7-200 PLC, PLC Cable and Laptop

5. How to Serial Port Number Check in Windows 7
How to Serial Port Number Check in Windows 7

Video About How to Serial Port Number Check


B. Visual Basic Express Programming for PLC and Computer Communication
1. Layout Form in Visual Basic
Layout Form in Visual Basic for PLC and Computer Communication

2. Communication setting in SerialPort Properties
Communication setting in SerialPort Properties

3. Visual Basic Code
Imports System.Threading

Public Class Form1

    Private Sub Form1_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
        If (spPLC.IsOpen = True) Then
            spPLC.Dispose()
End If
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        spPLC.PortName = "COM7"  'serial port number = 7

        Try
            spPLC.Open()
        Catch ex As Exception
            Me.Text = ex.Message
        End Try
    End Sub

    Private Sub bitQ_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles bitQ.Click
        Dim Qx As Byte
        Dim Qy As Byte
        Dim Qv As Byte



        If ((Val(txtQx.Text) > 31) Or (Val(txtQy.Text) > 7)) Then
            MsgBox("Qx >31 or Qy > 7")
            Return
        End If

        Qx = CByte(Val(txtQx.Text)) ' Qx.y
        Qy = CByte(Val(txtQy.Text)) ' Qx.y

        If (ckQv.Checked = True) Then
            Qv = 1 ' Q Value
        Else
            Qv = 0 ' Q Value
        End If

        Dim str_write(0 To 37) As Byte
        Dim Temp_FCS As VariantType
        Dim i As Long

        bitQ.Enabled = False

        str_write(0) = &H68
        str_write(1) = &H20
        str_write(2) = &H20
        str_write(3) = &H68
        str_write(4) = &H2
        str_write(5) = &H0
        str_write(6) = &H7C
        str_write(7) = &H32
        str_write(8) = &H1
        str_write(9) = &H0
        str_write(10) = &H0
        str_write(11) = &H43
        str_write(12) = &H1
        str_write(13) = &H0
        str_write(14) = &HE
        str_write(15) = &H0
        str_write(16) = &H5
        str_write(17) = &H5
        str_write(18) = &H1
        str_write(19) = &H12
        str_write(20) = &HA
        str_write(21) = &H10
        str_write(22) = &H1 'len = 1
        str_write(23) = &H0
        str_write(24) = &H1
        str_write(25) = &H0
        str_write(26) = &H0  ' type q
        str_write(27) = &H82  'type q
        str_write(28) = &H0
        str_write(29) = &H0
        str_write(30) = Qx * 8 + Qy
        str_write(31) = &H0
        str_write(32) = &H3
        str_write(33) = &H0
        str_write(34) = &H1
        str_write(35) = Qv

        For i = 4 To 35
            Temp_FCS = Temp_FCS + str_write(i)
        Next
        str_write(36) = Temp_FCS Mod 256
        str_write(37) = &H16
        If (spPLC.IsOpen = True) Then
            ' Send the binary data out the port
            spPLC.Write(str_write, 0, str_write.Length)

            Thread.Sleep(100) 'wait 100ms

            End_comm() 'end Communication

        End If

        bitQ.Enabled = True

    End Sub

    Private Sub End_comm()
        'End Communication
        Dim str_val(0 To 5) As Byte

        spPLC.ReadExisting()

        str_val(0) = &H10
        str_val(1) = &H2
        str_val(2) = &H0
        str_val(3) = &H5C
        str_val(4) = &H5E
        str_val(5) = &H16
        If (spPLC.IsOpen = True) Then
            spPLC.Write(str_val, 0, str_val.Length)
        End If
    End Sub

    Private Sub ckQv_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ckQv.CheckedChanged
        If (ckQv.Checked = True) Then
            ckQv.Text = "Qv = 1"
            bitQ.Text = "Write Bit Q" + txtQx.Text + "." + txtQy.Text + " = 1"
        Else
            ckQv.Text = "Qv = 0"
            bitQ.Text = "Write Bit Q" + txtQx.Text + "." + txtQy.Text + " = 0"
End If
    End Sub

    Private Sub txtQx_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtQx.TextChanged
        If (ckQv.Checked = True) Then
            ckQv.Text = "Qv = 1"
            bitQ.Text = "Write Bit Q" + txtQx.Text + "." + txtQy.Text + " = 1"
        Else
            ckQv.Text = "Qv = 0"
            bitQ.Text = "Write Bit Q" + txtQx.Text + "." + txtQy.Text + " = 0"
        End If

    End Sub

    Private Sub txtQy_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtQy.TextChanged
        If (ckQv.Checked = True) Then
            ckQv.Text = "Qv = 1"
            bitQ.Text = "Write Bit Q" + txtQx.Text + "." + txtQy.Text + " = 1"
        Else
            ckQv.Text = "Qv = 0"
            bitQ.Text = "Write Bit Q" + txtQx.Text + "." + txtQy.Text + " = 0"
        End If
    End Sub

    Private Sub Ixy_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Ixy.Click
        Dim str_read(0 To 32) As Byte
        Dim i As Integer
        Dim Temp_FCS As VariantType
        Dim Rx As String

        Rx = 0 ' Read from I0.0

        str_read(0) = &H68
        str_read(1) = &H1B
        str_read(2) = &H1B
        str_read(3) = &H68
        str_read(4) = &H2
        str_read(5) = &H0
        str_read(6) = &H6C
        str_read(7) = &H32
        str_read(8) = &H1
        str_read(9) = &H0
        str_read(10) = &H0
        str_read(11) = &H0
        str_read(12) = &H0
        str_read(13) = &H0
        str_read(14) = &HE
        str_read(15) = &H0
        str_read(16) = &H0
        str_read(17) = &H4
        str_read(18) = &H1
        str_read(19) = &H12
        str_read(20) = &HA
        str_read(21) = &H10
        str_read(22) = &H8 'read len 1=bit, 8=byte
        str_read(23) = &H0
        str_read(24) = &H1
        str_read(25) = &H0
        str_read(26) = &H0 ' type Ixy
        str_read(27) = &H81 'type Ixy=&H81, Qxy=&H82
        str_read(28) = &H0
        str_read(29) = (Str(Rx) * 8) \ 256
        str_read(30) = (Str(Rx) * 8) Mod 256


        For i = 4 To 30
            Temp_FCS = Temp_FCS + str_read(i)
        Next i
        str_read(31) = Temp_FCS Mod 256
        str_read(32) = &H16
        If (spPLC.IsOpen = True) Then
            ' Send the binary data out the port
            spPLC.Write(str_read, 0, str_read.Length)
            Thread.Sleep(100) 'wait 100ms
            End_comm() 'end communication
        End If

    End Sub


    Private DisplayDelegate As New DisplayData(AddressOf Display)

    Private Sub spPLC_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles spPLC.DataReceived

        'Suppose that you want to use the built-in SerialPort control (System.IO.Ports.SerialPort)
        'this code is equivalent to the EnhancedSerialPort DataReceived code
        Dim BytesAvailable As Integer = spPLC.BytesToRead
        If BytesAvailable >= 29 Then 'Total byte data from I = 29
            Dim Buffer(0 To BytesAvailable - 1) As Byte
            spPLC.Read(Buffer, 0, BytesAvailable)
            Me.BeginInvoke(DisplayDelegate, Buffer)
        End If

    End Sub

    Public Delegate Sub DisplayData(ByVal Buffer() As Byte)
    'This delegate routine marshals receive data from the receive thread context DataReceived to the Windows Form STAThread context
    Private Sub Display(ByVal Buffer() As Byte)

        Dim xyval As Byte
        xyval = Buffer(25)
        txtI00.Text = (xyval And 1) / 1
        txtI01.Text = (xyval And 2) / 2
        txtI02.Text = (xyval And 4) / 4
        txtI03.Text = (xyval And 8) / 8
        txtI04.Text = (xyval And 16) / 16
        txtI05.Text = (xyval And 32) / 32
        txtI06.Text = (xyval And 64) / 64
        txtI07.Text = (xyval And 128) / 128

    End Sub

    Private Sub InputScan_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles InputScan.Tick
        Ixy_Click(New Object(), New EventArgs())
    End Sub
Private Sub scan_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles scan.CheckedChanged
        If (Val(TimeScan.Text) < 200) Then TimeScan.Text = 200
        InputScan.Interval = Val(TimeScan.Text)

        If (scan.Checked = True) Then
            InputScan.Enabled = True
            Ixy.Enabled = False
        Else
            InputScan.Enabled = False
            Ixy.Enabled = True
        End If
    End Sub
End Class


4. Download Visual basic Code

Video about How to use Download File: PLC and Computer Communication

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