How does a pen’s ScanValue property work in an E3Chart? Does this property have any influence on BufferSize property? How does BufferSize property work?
Solution:
The ScanValue property stands for the pen’s scan in an E3Chart, that is, for the time when E3Chart checks whether a pen’s value has changed. If the ScanValue is zero, or if the point changes before the ScanValue, then the points will be connected through a straight line. Otherwise, a straight line will be drawn up to the pen’s last scan, keeping the old point’s value, a from this last scan on a new straight line will be connected to the new point.
Example: ScanValue=1s and tag variation every 10s: If the value of the first point in the chart is 8 and the second one is 15, a straight line whose constant value is 8 and whose duration is 9 seconds should be drawn, and from that point on a new straight line should go from 8 to 15.
The BufferSize property stands for the amount of points being stored in memory, and it is not influenced by ScanValue. If BufferSize property is 10, when the 11th tag variation takes place, the first one will be discarded and the last one will be included in the memory.
