where can I found a list of OPC servers that are (not) supported by the PI OPC DA interface?
In addition to what flost said, OPC DA is a standard that is maintained by the OPC Foundation, so as long as the OPC server follows the standard, then the PI Interface for OPC DA should be able to read data from it.
The other thing I would add is that sometimes the OPC server vendor may have some additional nuances like licensing or security configurations which may affect the PI Interface for OPC DA. However, the vendor should be able to inform you on how to properly configure these settings so that an OPC client (like the PI Interface) is able to connect and read data.
Well that´s easy: All OPC Servers that do not support the protocoll OPC-DA (e.g. OPC-xml DA Servers or OPC-UA Servers)
I personally have not senn problems with OPC-DA Servers and the interface.
both thanks for the reply.
I'm not new to OPC. Working already in 1999 with OPC, but I'm looking for the list for the following reason. We are working as an integrator of OSIsoft. Customers are asking for an estimation how long it takes to configure the OPC interface (node). When everything is standard, there isn't an issue and we can do a proper estimation based on previous projects, but when it is a special OPC server you want to know before, because you can take account of that in the estimation.
Some OPC servers work better than others. Especially when the volumes or frequency of communication increases.
I might depend on maxed-out controllers, controller network limitations, hidden limitations on OPCservers (e.g. max number of OPCitems per group), memory leaks on OPCservers, etc.
So yes, they al support the standard, but some are more expensive to get running smoothly than others. Personally i don't have a list, but the rule-of-thumb for me: the older the OPCserver, controller or network , the more issues to expect.
We generally look to Kepware and Matrikon as reliable OPC servers. OPC servers from DCS vendors tend to be hit and miss in their quality. Some are excellent and some are.. troublesome.
Experience is the only guide.
HI Robert, I agree with both Gavin and Roger. As long as the OPCserver follows the OPC DA standard you should be able to use PI OPC DA interface. The limitations of the OPC servers if they exists won't be specific to the connection to PI OPC interface but they will affect any clinet that connects to it (eg, licensing limitations, OPC items per group...)
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