The file is not created by a single hardware vendor. Instead, it is generated and distributed by the as part of the OPC Core Components Redistributable package. When you install software from major vendors like Siemens, Rockwell Automation, GE, or Kepware, the installer often silently places opcnetapidll into your system directory (typically C:\Windows\System32\ or C:\Windows\SysWOW64\ ).
Because it is a .NET assembly, it provides IntelliSense and compile-time checking in Visual Studio, reducing bugs in production. How to Use OpcNetApi.dll in Your Project opcnetapidll
Create an instance of a server object (e.g., Opc.Da.Server ). The file is not created by a single hardware vendor
However, because of the massive amount of legacy hardware still in operation, knowing how to work with OpcNetApi.dll remains a highly valuable skill for industrial software engineers. Because it is a
// Correct way to reference OPC .NET API using OpcNetApi; // Requires adding a reference to opcnetapi.dll
: Provides a consistent set of classes and methods to access different OPC specifications (Data Access, Historical Data, Alarms & Events) through a single API. COM Interoperability
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