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When the value of Scan Off is shown for a tag that has the Scan set to ON, this typically means that the tag's configuration or the interface's configuration (PI to PI in this case) has changed such that the tags are no longer connected to the interface. This would likely be easier handled as a Tech Support case, but I would ensure that the tags on the mirrored destination server Point Source, Interface ID, and Scan Class all match up to the settings configured for your PI to PI Interface.
thanks for the help
and yes, the interface ID, and scan class does not match in the configuration.
i tried matching the attributes for one tag, and for a few minutes the value seems to come in, then it goes back to SCAN OFF again. do you suggest to match all the attributes for all tags first sir?
Are you doing any changes when Interface is running? if you change and location, pointsource and other details when interface is running it will move to scanoff and you may need to wait till it recieves new value.