有时候需要PC和PLC进行信号交互，用IO的话比较麻烦，大部分PLC可以直接用串口，网口再选择特定的协议进行通讯。
基恩士通讯协议有很多，其中上位链路通讯是最简单的，然后我们通过TCP/IP发送上位链路通讯的指令就能达到要求。
效果：通过上位机直接控制并读取R继电器状态，直接往DM里面设置需要的值，读取DM里面的值
资源文件列表
WindowsFormsApplication13/WindowsFormsApplication13/bin/Debug/WindowsFormsApplication13.exe , 13824
WindowsFormsApplication13/WindowsFormsApplication13/bin/Debug/WindowsFormsApplication13.pdb , 30208
WindowsFormsApplication13/WindowsFormsApplication13/bin/Debug/WindowsFormsApplication13.vshost.exe , 11600
WindowsFormsApplication13/WindowsFormsApplication13/bin/Debug/WindowsFormsApplication13.vshost.exe.manifest , 490
WindowsFormsApplication13/WindowsFormsApplication13/Form1.cs , 5675
WindowsFormsApplication13/WindowsFormsApplication13/Form1.Designer.cs , 12004
WindowsFormsApplication13/WindowsFormsApplication13/Form1.resx , 5817
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/DesignTimeResolveAssemblyReferences.cache , 2867
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/DesignTimeResolveAssemblyReferencesInput.cache , 6377
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/WindowsFormsApplication13.csproj.FileListAbsolute.txt , 1941
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/WindowsFormsApplication13.csproj.GenerateResource.Cache , 975
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/WindowsFormsApplication13.exe , 13824
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/WindowsFormsApplication13.Form1.resources , 180
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/WindowsFormsApplication13.pdb , 30208
WindowsFormsApplication13/WindowsFormsApplication13/obj/x86/Debug/WindowsFormsApplication13.Properties.Resources.resources , 180
WindowsFormsApplication13/WindowsFormsApplication13/Program.cs , 506
WindowsFormsApplication13/WindowsFormsApplication13/Properties/AssemblyInfo.cs , 1382
WindowsFormsApplication13/WindowsFormsApplication13/Properties/Resources.Designer.cs , 2902
WindowsFormsApplication13/WindowsFormsApplication13/Properties/Resources.resx , 5612
WindowsFormsApplication13/WindowsFormsApplication13/Properties/Settings.Designer.cs , 1112
WindowsFormsApplication13/WindowsFormsApplication13/Properties/Settings.settings , 249
WindowsFormsApplication13/WindowsFormsApplication13/WindowsFormsApplication13.csproj , 3709
WindowsFormsApplication13/WindowsFormsApplication13.sln , 917
WindowsFormsApplication13/WindowsFormsApplication13.suo , 20992