Chapter 3 Creating and Editing Screens
Revision May, 2010 3-245
History Buffer Setup Dialog Box
History
Buffer
Setup
Extra history data will occupy the data file symbol.
BytesbNaBytes Size File Actual8 )()(
a Data File Symbol
b Sampling Points
Example:
Suppose that the user adds two history data. The data length of the fist history
data is set to 1 and the sample number of the first history data is set to 10000.
The data length of the second history data is set to 2 and the sample number of
the second history data is set to 20000. Both these two history data all have the
time and date recorded, so the required dat file capacity for these two history
data are:
The file capacity of the first history data = [(6Bytes + 2Bytes) × 10000] =
80000Bytes.
The file capacity of the second history data = [(6Bytes + 2 × 2Bytes) × 20000] =
200000Bytes.
The capacity of Data File Symbol = 8Bytes × 2 = 16 Bytes
Total require: 80000Bytes + 200000Bytes + 16Bytes = 280016Bytes = Approx.
0.268Mbytes.
2. csv file
MBytes
BytesaN Size File Actual
10241024
240
)(
a Sampling Points
Example:
Suppose that the user adds two history data. The data length of the fist history
data is set to 1 and the sample number of the first history data is set to 10000.
The data length of the second history data is
set to 2 and the sample number of
the second history data is set to 20000. Both these two history data all have the
time and date recorded, so the required csv file capacity for these two history
data are:
The file capacity of the first history data = 10000 × 240Bytes = 2400000Bytes.
The file capacity of the second history data = 20000 × 240Bytes =
4800000Bytes.
Total require: 2400000Bytes + 4800000Bytes = 7200000Bytes = Approx.
6.8Mbytes.