If you are developing a new industrial application from scratch, it is highly recommended to target OPC UA using the official rather than relying on OpcNetApi.dll . However, if you must interface with older PLCs or factory systems that cannot be upgraded, OpcNetApi.dll remains your primary tool. Conclusion and Best Practices
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Ensure all related OPC binaries are set to Copy Local = True within your project properties, or install them natively via the official OPC .NET API Redistributables . If you are developing a new industrial application
Before examining opcnetapi.dll , it's essential to understand the technology it interfaces with. OPC, which stands for Object Linking and Embedding (OLE) for Process Control, is a series of standards and specifications for industrial telecommunication. It was created to bridge the gap between Windows-based applications and field process control devices, essentially providing a common interface for different industrial systems to communicate. By standardizing how data is accessed, OPC eliminates the need for software developers to write custom drivers for each unique hardware device. This link or copies made by others cannot be deleted
2. ClassNotReg (Class Not Registered) or 32-bit/64-bit Mismatch NET api: can't find opcnetapi.dll | Page 2 | Classic OPC