Basic History Trend
I am facing something I have never faced before, I have a group trend in 5.1.1 having 13 OPC tags, all tags use same log configuration template and trend configuration is SEEMLESS and time average. Some of the trends dispalyed are behind time, some are displayed as per actual time and some of them are displayed ahead of time. Picture attached. Thanks.
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Traces 6 and 7 seem ”frozen”. Logging of such properties need a proper Max Time setting to paint a trend while value is stable. Max Time = 2x Min Time is a good starting point. Do not go lower.
Reasons for data ahead of time are few; most likely lack of clock synchronization. Ensure the OPC server has correct time.
It looks like that you have a "futures values" issue. Probably, system has 2 connectivities servers and they are not running with the same time in Basic History service. So, try to force synchronization or use applog tool, as shown in attached file.