S7.NET.DLL基于西门子GET/PUT封装了读取以及写数据功能，下面是不成熟的程序，基本可以将数据从PLC读出，也可将数据写入PLC，仅供参考，以下是原代码：
Option Explicit On
'Imports System.Collections.ge
'Imports System.Linq
Imports System.Text
'Imports System.Threading.tas
Imports S7.Net
Public Class Form1
Dim Rack As Short
Dim slot As Short
Dim IPAddress As String = “192.168.1.50”
Dim CPUTypes As String
'Dim PLC_Pallet = New Plc(CpuType.S7300, "192.168.1.1", Rack, slot)
Dim PLC_Pallet = New Plc(CPUTypes, IPAddress, Rack, slot)
Dim AppXls As Microsoft.Office.Interop.Excel.Application
Private Sub Btn_Connect_Click(sender As Object, e As EventArgs) Handles Btn_Connect.Click
CPUTypes = CStr(Combox_CPUType.Text)
IPAddress = txtAddress.Text
Rack = Short.Parse(txtRack.Text)
slot = Short.Parse(txtSlot.Text)
PLC_Pallet = New Plc(CpuType.S7300, IPAddress, Rack, slot)
Try
PLC_Pallet.Open()
Catch ex As Exception
MessageBox.Show("连接PLC设备失败")
End Try
End Sub
Private Sub Btn_Write_Click(sender As Object, e As EventArgs) Handles Btn_Write.Click
PLC_Pallet.Write("DB1.DBX0.1", True)
PLC_Pallet.Write("DB1.DBD12.0", 123457)
End Sub
Private Sub Btn_Write_Click(sender As Object, e As EventArgs) Handles Btn_Write.Click
PLC_Pallet.Write("DB1.DBX0.1", True)
PLC_Pallet.Write("DB1.DBD12.0", 123457)
End Sub
End Class
