His Tory Data Dis Play Part - Maple Systems Silver Series Installation And Operation Manual

Bar Graphs, Me ters and Trends 258
History Data Display
The History Data Display shows data captured by the Data Sampling object (for more information on using the Data
Sampling object, see Chapter 12: Bar Graphs, Meters and Trends, Section 'Creating Trend Displays & Data
Sampling Objects').
Data is displayed in tabular format with option to show the time and/or date of when data was captured. A control
register is used to determine which historical data record is displayed (i.e. most recent, yesterday, etc.) based upon
date of capture:
The OIT reads from the Sampling Object datalog file (*.dtl) immediately after the screen that contains the History
Data Display object is displayed. Note: the data is only read and updated whenever the screen is first displayed.
Data recorded to the datalog file (*.dtl) after the History Data Display object is shown will not appear on the History
Data Display object until the screen is refreshed (closed, then opened again). A maximum of 20 channels can be
displayed.
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