ST-72 User's Manual
Document: UM-1007
Revision Level A
118
8.3
CHANNEL SCREEN
The Channel screen shown in Figure 8-3 displays a 24 hour trend of input data for the
channel selected. Vertical tic marks are each hour and horizontal tic marks are each
10% of full scale. Colored lines indicate alarm levels. Since each data point must be
collected for several minutes before it may be displayed, it is likely input values will
fluctuate during this interval. Therefore, MAX, MIN and AVERAGE values are stored in
the controller for each subinterval. Checking the Min, Max and Avg box in the lower left
corner turns the respective lines on and off. If there is no trend data available, the
corresponding section of the graph will be grayed out. This will occur on power
interruptions.
The top portion of each trend screen indicates channel number, real time reading in
engineering units, and measurement name. When a channel reaches alarm state, the
colored bar changes to the color that represents that alarm level and flashes. Once the
alarm is acknowledged the bar stops flashing.
The top portion of the page updates automatically every 15 seconds. The trend is
updated when a channel is changed or the ‘Refresh Trend’ button is pressed.
Figure 8-3
Summary of Contents for ST-72
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Page 129: ...ST 72 User s Manual Document UM 1007 Revision Level A 123 8 5 4 PROGRAMMABLE RELAYS Figure 8 8...
