// Typically you add a Reference to the DLL in Visual Studio using OpcRcw.Da; // Example namespace from OPC .NET API
: Acts as a high-level wrapper for OPC Classic specifications, allowing .NET developers to access data from hardware (like PLCs) without writing low-level COM code.
If you are planning to modernize an older control system, let me know more about your infrastructure: opcnetapidll
It is important to note that OpcNetApi.dll is primarily used for (DA, HDA). While it is still widely used in existing industrial plants, the industry is moving toward OPC UA (Unified Architecture) . OPC UA does not rely on COM/DCOM and uses a completely different set of libraries.
Here is a breakdown of its key aspects:
Historically, these files were buried deep in the OPC Foundation’s Core Components installer. However, the OPC Foundation provides these assemblies conveniently as OPC.NET API NuGet Packages. Note that while these DLLs are widely used, developers should be aware that support for Classic OPC COM libraries will be largely focused on maintenance, with active feature development now universally directed toward OPC UA (Unified Architecture). The Future: OPC Classic vs. OPC UA
Used for real-time data exchange. It monitors active values like temperature, pressure, and motor statuses. // Typically you add a Reference to the
Microsoft regularly updates DCOM security requirements (such as enforcing RPC_C_AUTHN_LEVEL_PKT_INTEGRITY). Ensure your application code passing through OpcNetApi explicitly requests secure authentication levels to prevent connection rejection by modern Windows patches.
By separating the API specification ( OpcNetApi.dll ) from the communication implementation ( OpcNetApi.Com.dll ), the architecture ensures that developer code remains clean and decoupled from low-level Windows registry and COM mechanics. 3. Common Error Scenarios OPC UA does not rely on COM/DCOM and
Are you targeting (Data Access) or OPC HDA (Historical Data)?