Specifications

11 – Configuring Group and Trend Displays
232 R400
About the Configuration of Trend Sets
Trend sets are easy to configure. You only need to enter the point IDs and specify
the type of history details you want to view.
You use a Trend Set Definition display to create a new trend set, but trend sets
can be modified directly from a Trend Set display. This makes it easy for
operators to change the trend set configuration interactively in order to analyze
process history.
By default, an operator can change the configuration of a trend set while it is
being displayed. To restrict the ability to change the points or parameters in a
trend set display, set the MNGR or ENGR security level required to change
traces checkbox.
Tip You can use the list in the Trend description field at the top of the Trend Set display
to choose a different trend to view.
Creating Trend Sets
To add a new trend set to the list:
1 From the System Configuration Menu display, click Trends.
2 In the Trend Set Summary display, click an unassigned area in the
Description column. This opens the Trend Set display for a specific trend.
3 In the Title field, enter the name of the trend.
4 Select a trend set type from the Trend Type list.
5 In the Sample Interval field, select the desired history interval from the list
(for example, 1-minute snapshots, 6-minute averages, and so on).
6 In the Trend Range field enter the range you want to display. Note that this
is for display only and does not affect the actual range of the point.
7 In the Samples field, enter the number of samples to be displayed. This
number must be a value from 1 to 1000.
8 If you want to prevent operators from changing the configuration of the
trend set, select the MNGR or ENGR security level required to change
traces checkbox.
9 Under Traces, enter the point ID of each point you want to add to the trend
set.
10 Use the Parameter drop-down list to select the point parameter to be
trended for each point.
11 To enable or disable the trend for each point, click the Pen on/off
checkbox.
plscpcg.book Page 232 Monday, May 28, 2001 10:11 AM