If you’ve landed here, you’re likely looking for a reliable SR Modbus TCP DLL to integrate Modbus TCP communication into your C#, VB.NET, or LabVIEW application. Let’s cut through the confusion. What is the “SR Modbus TCP DLL”? The term “SR” often refers to Sokrates or Schneider Electric legacy libraries, but more commonly it’s shorthand for Simple Reliable Modbus TCP DLLs from various vendors. There is no single official “SR Modbus TCP DLL” – instead, several proven libraries are used interchangeably. Where to Download a Trusted Modbus TCP DLL Do not download DLLs from random forum posts or file-sharing sites (malware risk). Use official sources:

Happy coding, and may your coils stay true! Have a specific PLC model in mind? Mention it in the comments – I’ll point you to the exact DLL and sample code.

modbusClient.Disconnect(); DLL not found? Set Copy Local = True in the DLL’s properties.

// Read holding registers 0-2 int[] registers = modbusClient.ReadHoldingRegisters(0, 3); Console.WriteLine($"Register 0: registers[0]");

| Library | Best for | Download Source | |--------|----------|----------------| | (.NET) | C#, VB.NET, LabVIEW | NuGet: Install-Package EasyModbus | | NModbus | .NET Framework / Core | NuGet: Install-Package NModbus | | libmodbus (C/C++) | Cross-platform | GitHub: libmodbus/libmodbus | | Modbus TCP Master DLL (SRP Tools) | Quick testing | srpcontrol.com (legacy) | ✅ Recommended : Start with EasyModbusTCP – it’s free, open-source, and includes a ready-to-use DLL. Step-by-Step: Download & Use EasyModbusTCP.dll 1. Create a new Visual Studio project (C# Console App) 2. Install via NuGet (cleanest method) Tools → NuGet Package Manager → Package Manager Console Run: