上位机连接西门子S71200 亲测 ，同理也可连接西门子1500

通过西门子开源DLL ，libnodave.dll连接西门子PLC，亲测，可读取西门子S71200里的DB1.DBW0,连续读取，无需OPC配置。只是抛砖引玉，后续读取封装自行编写。

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace WpfApplication1
{
    /// 

    /// App.xaml 的交互逻辑
    /// 

    public partial class App : Application
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件       1010  2018-02-11 14:28  S71200\WpfApplication1\S71200.sln

    ..A..H.     52736  2018-02-11 14:26  S71200\WpfApplication1\S71200.suo

    ..A..H.     54784  2018-02-11 14:41  S71200\WpfApplication1\S71200.v12.suo

     文件        187  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\App.config

     文件        326  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\App.xaml

     文件        342  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\App.xaml.cs

     文件     126976  2018-01-12 09:39  S71200\WpfApplication1\WpfApplication1\bin\Debug\libnodave.dll

     文件      14848  2018-01-12 09:39  S71200\WpfApplication1\WpfApplication1\bin\Debug\libnodave.net.dll

     文件      13312  2018-02-11 14:36  S71200\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.exe

     文件        187  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.exe.config

     文件      38400  2018-02-11 14:36  S71200\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.pdb

     文件      24224  2018-02-11 14:41  S71200\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe

     文件        187  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe.config

     文件        490  2010-03-17 22:39  S71200\WpfApplication1\WpfApplication1\bin\Debug\WpfApplication1.vshost.exe.manifest

     文件        606  2018-02-11 14:32  S71200\WpfApplication1\WpfApplication1\MainWindow.xaml

     文件       3138  2018-02-11 14:36  S71200\WpfApplication1\WpfApplication1\MainWindow.xaml.cs

     文件       2325  2018-02-11 14:25  S71200\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs

     文件       2325  2018-02-11 14:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\App.g.i.cs

     文件       7197  2018-02-11 14:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       1022  2018-02-11 14:32  S71200\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.baml

     文件       3788  2018-02-11 14:32  S71200\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.g.cs

     文件       3788  2018-02-11 14:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\MainWindow.g.i.cs

     文件          0  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs

     文件          0  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs

     文件          0  2018-02-11 13:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs

     文件       1807  2018-02-11 14:41  S71200\WpfApplication1\WpfApplication1\obj\Debug\WCSConnectPlc.csproj.FileListAbsolute.txt

     文件        919  2018-02-11 14:28  S71200\WpfApplication1\WpfApplication1\obj\Debug\WCSConnectPlc.csproj.GenerateResource.Cache

     文件       1553  2018-02-11 14:27  S71200\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.csproj.FileListAbsolute.txt

     文件        919  2018-02-11 14:25  S71200\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.csproj.GenerateResource.Cache

     文件      13312  2018-02-11 14:36  S71200\WpfApplication1\WpfApplication1\obj\Debug\WpfApplication1.exe

............此处省略24个文件信息