What is OPC Self-Certification?
OPC Self Certified is a certification from the OPC Foundation. Available only to vendors who take their software to OPC Interoperability workshops who test their software against the OPC Foundation's OPC Analyzer software.

What is the OPC Analyzer?
The OPC Analyzer is a tool for testing OPC Client applications. This tool can be used to spy on the communications between an OPC Client and OPC Server, it can also be used to inject errors into the communications stream.

What is the objective of this testing?
There are several objectives, these are:
1) The software does not crash
2) The software gracefully handles any/all situations, including bad/eronious behavior
3) The software provides information to inform the end-user of problems

Must a vendor go to the OPC Interoperability Workshop to attain this certification?
Yes.

Why you should care!
OPC software, by its inherent nature, is important software as it typically monitors and/or controls your production via automation. Therefore, it should be of high value to end-user's to know that the OPC software they're investing in has been thoroughly tested and is certified by an independent 3rd party or organization. If you are using software that has not been certified, you need to ask your vendor why.

Which OPC Interfaces have been officially tested?
OPC DA 2.00, 2.05a and 3.00.

Which of the OPC Systems .NET software and components have this certification?
All of them.