Good morning. This is probably an easy question but I'm having a hard time finding a clear answer.
I've got an OPC connection that we monitor in Ignition and we also monitor/use this same connection in our control system. In Ignition, I periodically see this OPC connection briefly go out by means of our watchdog which is just monitoring the connection status to the OPC server.
The point of confusion stems from the fact that I'm not seeing that lost connection in the control system.
These mostly appear to be brief blips, but I'm trying to get a better understanding of how the actual connection status to the OPC server is updated & monitored. If it were tag updates, I'd understand that but I'm not sure on the actual connection status & I'm having a hard time filtering out my search results to not return results for tag group scan rates & that sort of thing.
Just trying to get a better understanding to try and make sense of the disparity between these two systems.
Thanks!
Can you further explain what you mean by this?
How are you monitoring it? This is an OPC connection from Ignition to some other 3rd party OPC server you're talking about?
First off - wow... what an incredibly quick reply 
Yes - I'm monitoring a 3rd party OPC connection as per below.
So we have a watchdog alarm that is tied to the actual OPC connection status as found in Status > Connections > OPC Connections
Here's how the watchdog is configured.
My belief here is the watchdog is monitoring that status as shown in the first image.
I'm kind of just trying to figure out how often the status of that connection is polled. I'd assume you can't subscribe to the status of the actual connection, so my best guess is that it's polled in some fashion to ensure that there is still an active connection.
The underlying data is refreshed @ 1s.
The tag group / rate doesn't matter, memory tags update immediately in the tag system, they aren't polled.
Perfect. Thanks for the clarification. That helps. I'd see watchdog alarms for less than a second to 30 seconds or so at a time & was just trying to get a better understanding of what that was actually indicative of... but seems a watchdog failure of 30 seconds in this case means it was actually out for 30 seconds.
Now to figure out why & why I don't see that on our control system.
Thanks for the help!
