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FORM 160.72-O1 (810)
figure 41 -
TREND SETUP SCREEN
overvieW
This screen is used to configure the trending screen.
The parameters to be trended are selected from the
Common Slots Screen or Common Slots Master list
and entered as Slot Numbers for Data Points 1 through
6. The Y-axis minimum and maximum values for each
parameter are entered as Data Point Min and Data Point
Max for Data Points 1 through 6. The interval at which
all the parameters are sampled is selected as the Data
Collection Interval.
displaY onlY
None
prograMMaBle
Chart Type
Access level Required: OPERATOR
Selects CONTINUOUS, ONE SCREEN or TRIG-
GERED type of graph.
JOHNSON CONTROLS
Trend seTup sCreen
Collection interval
Access Level Required: OPERATOR
Selects the interval at which the parameters are sam-
pled. There are 450 data points displayed across the
X-axis of the graph. Each point represents the instan-
taneous value of the parameter. The user selects the
time interval between these points. This is called the
DATA COLLECTION INTERVAL or the interval at
which the parameter is sampled. This interval is pro-
grammable over the range of 1 second to 3600 seconds
(1 hour), in one second increments. The selected inter-
val not only determines the sample interval, but also the
full screen time display. The full screen time display is
a result of the selected interval in seconds, multiplied
by the 450 data points.
For example, if the Data Collection Interval is pro-
grammed for 900 seconds, the parameter would be
sampled every 900 seconds, with the last 112.5 hours
(4.7 days) of data viewable on the screen. Therefore,
the selected interval is a compromise between resolu-
tion and full screen time display.
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