PI WS PlotValues behaviour

Discussion created by Bannikov on Oct 16, 2013
Latest reply on Jan 16, 2014 by AKorobochkin



We're retrieving data with PI Web Services using GetPIArchiveData with the following request

requests[j] = new PIArcDataRequest();
                requests[j].TimeRange = new TimeRange();
                requests[j].PIArcManner = new PIArcManner();
                requests[j].Path = trendPaths[j];
                requests[j].TimeRange.Start = ((HiChartVWP)Parent).StartTime;
                requests[j].TimeRange.End = ((HiChartVWP)Parent).EndTime;
                requests[j].PIArcManner.RetrievalType = PIArcMannerRetrievalType.PlotValues;
                requests[j].PIArcManner.NumValues = 10;
                requests[j].PIArcManner.Updates = false;

 Even though according to the PI WS manual, the highest number of points we can get in such a case is 50 (i.e. NumValues * 5), we can get a number higher than that (depending on a TimeRange). Hence the question: is our request wrong in some way, or is it PI WS that work in such a manner?