My Main.vi manually writes data to Memory tags in DSC. If my Main is running, calls to Read Historical Trend.vi and Read Historical Trends.vi sometimes take a very long time (~60 seconds in some cases). In addition, most of the time the last data point from that time period is missing.
For example, I have a discrete tag that is False before the start time, and goes True and then False again before the stop time. I know that this happens because I can see it in the Tag Monitor. However, when I call Read Historical Trend.vi, only 2 data are returned: a 0 with a timestamp from before the start time, and a 1 with a timestamp just after the start time. There is no 0 with a timestamp befor
e the stop time, but there should be. If I wait for several and then try again, sometimes the data will be correct. But if I stop Main.vi and try again with the same exact timestamps, the data are returned immediately and nothing is missing.
I also occasionally get Error -1967390704 occurred at CIT_ReadStringTrace.vi. I'm not sure what causes that, because it doesn't happen every time.
I am using Labview 6.0.2, DSC 6.0.2 with the fixes, and the latest Logos (4.4).
