When using the “Is Connected” tag for showing device up/down status in gateway util in 7.7… If the IP of the connection to the PLC is not valid I get a broken link overlay showing a tag and information symbol and the status in the gateway shows a cycling “Connecting…Connecting: Determining Protocol…

The quality of the “Is Connected” tag shouldn’t be going bad when the connection drops, that’s likely a bug. That being said, the tag having bad quality is probably just as good an indicator that it’s not connected as value=False and good quality. So you could watch for (value=False || Bad Quality) …

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Beaconing Device Status in Gateway