MS Server Express.
I am reading the temperature from a heat treatment furnace into ignition. The data comes from a S7-1200 using the PLC’s OPC UA server. I have tag history enabled and I am struggling to get the “on change” mode to work - no data is logged. It seems like ignition is not detecting the change in value. I use the on change mode for all my other historical tags with no issues. This is the only historical tag that comes from a third party OPC UA server.
I have noticed that if I enable “on change” the “sqlth_te” SQL table immediately shows a new, but retired tag.
If I use periodic mode, the data is logged to SQL as expected. Please can someone suggest a way to fix this issue?