|
Select a trend.
|
Click the parameter reference in the Legend.
|
|
Deselect a trend.
|
Press the
CTRL key as you click the parameter
reference in the Legend.
|
|
Quickly access chart commands.
|
Right-click in the graph and select a command.
|
|
Quickly access trend commands.
|
Right-click in the Legend and select a command.
|
|
Add and remove columns from the Legend.
|
Double-click the Legend to open the
Legend Columns dialog.
|
|
Show data points.
|
Click
,
select the
Chart Preferences tab, and click
Mark Data Points.
|
|
Select data points.
|
Show data points and place the cursor over a data point. The
data point is selected when the cursor turns into a
 .
|
|
Move between data points and events.
|
Select a data point or an event as a starting place, and hold
down the
ALT key as you press the
RIGHT ARROW or
LEFT ARROW key.
|
|
Move the vertical time line on the graph.
|
Click anywhere in the graph. A vertical line appears at the
point where you clicked. This line marks the time at that point. To move the
line, hold down the
ALT key as you press the
RIGHT ARROW or
LEFT ARROW key.
|
|
Manually adjust the Y scale.
|
Click a data point and hold down the mouse button as you move
the trend up and down.
|
|
Move a trend horizontally along the X scale.
|
Click a data point, press the
SHIFT key, and hold down the mouse
button as you move the trend to the right or left. (A trend that has been time
shifted appears as a dotted line.)
|
|
Manually adjust the Y scale as you move a trend along the X
scale.
|
Select the data point, press the
ALT key, and hold down the mouse button
and
ALT key as you move the trend vertically
and horizontally.
|
|
Reduce Busy values.
|
Some real-time values may show up as Busy if the computer is
heavily loaded or if you are using the interface features of Process History
View (scrolling, paging, and so on) that cause a lot of historical data to be
fetched (for example, multiple uses or a large time span). To perform an
analysis of data, add the parameter to history collection. When you see gaps in
the real time portion of the interface, refresh the data to read the historical
values. This typically fills in the Busy values with data unless the data
cannot be obtained from the source.
|
|
View event history from a Remote Operator Station
|
In order to view event history from a Remote Operator Station,
you must use another DeltaV workstation as the default events data server. To
do this, configure Process History View to connect to a workstation where the
DeltaV Alarms and Events subsystem is enabled.
You can configure the default data server on the
Event Chronicle tab of the
Set Default Data Servers dialog (click
) or in the
Configure Event Chronicle dialog for a
specific
Events or
E+Charts page (click
).
|
|
Limit the number of pages open
|
Only keep up to 4 pages of trends open in Process History
View, each with a maximum of 8 tags plotted for optimal application
performance.
|
|
Keep the chart update rate greater than 2 seconds
|
By default, the update rate is 5 seconds. Keeping the rate
above 2 seconds is recommended for optimal chart performance.
|
|
Keep the number of events over the time span from being too
large
|
Process History View chart performance corresponds, for the
most part, with the number of events in the Alarms and Events database for the
time span specified on the chart.
Larger data sets to be retrieved and filtered for display take
time.
Either reduce the size of the data set (under Alarms and
Events properties in DeltaV Explorer); or, split the plant areas into multiple
Event Chronicle so that there are fewer events stored in each Alarms and Events
database.
|