We've been successfully using QuickOPC for a while now, but we have recently found that when we try to connect to one of Emersons DeltaV systems we are unable to do so. The error we get when attempting to write is 'Class not registered'.
I have read through the following post, and feel I should mention that it is not an option for us to compile our product for x86. There is another dependency that is 64-bit.
www.opclabs.com/forum/connections-reconnections-com-dcom/2364-deltav-browsing-issue?start=0
Other OPC clients do not have an issue connecting, browsing, reading/writing from/to this server.
to explicitly answer the leading questions from the previous post:
1. Does it happen only with browsing, or with other OPC operations too?
-We are only attempting to write/subscribe to changes
2. Does it happen always, often, sometimes, rarely?
-always with this server, never with other servers
3. What about other OPC clients - can they browse?
-other clients do not have an issue.
4. Does your client run in 32-bit or 64-bit process?
-64-bit, and we cannot change that.
5. Is the client on the same machine as the server, or is it via DCOM - remotely?
-Both. DeltaV seems to have a feature where you can install a local copy of the server and it keeps the local copy synchronized with the external, main server, without requiring a DCOM configuration. We get this issue when we try to connect to either server.
Please let me know what other information I can provide, I understand that this is not a lot to go on.
I have read through the following post, and feel I should mention that it is not an option for us to compile our product for x86. There is another dependency that is 64-bit.
www.opclabs.com/forum/connections-reconnections-com-dcom/2364-deltav-browsing-issue?start=0
Other OPC clients do not have an issue connecting, browsing, reading/writing from/to this server.
to explicitly answer the leading questions from the previous post:
1. Does it happen only with browsing, or with other OPC operations too?
-We are only attempting to write/subscribe to changes
2. Does it happen always, often, sometimes, rarely?
-always with this server, never with other servers
3. What about other OPC clients - can they browse?
-other clients do not have an issue.
4. Does your client run in 32-bit or 64-bit process?
-64-bit, and we cannot change that.
5. Is the client on the same machine as the server, or is it via DCOM - remotely?
-Both. DeltaV seems to have a feature where you can install a local copy of the server and it keeps the local copy synchronized with the external, main server, without requiring a DCOM configuration. We get this issue when we try to connect to either server.
Please let me know what other information I can provide, I understand that this is not a lot to go on.