Operations HubConfigure Trend Chart Settings
Before you begin
Procedure
-
In the toolbar of the chart, select
.
The Trend Configuration window appears.
-
Modify the trend chart settings as specified in the following table.
Setting Description Mode Select the mode of the trend chart. The following options are available: - Live: Plots real-time data from a Historian server and/or OPC UA server.
- Historical: Plots historical data from a Historian server.
Note: Changes made to Live affect Historical as well. For example, if you add/delete properties from the chart in the Live mode, these changes reflect when you move to the Historical mode as well.Duration Select the duration for which you want to plot the data. If you want to select a duration that is not included in the default options, select Custom. Start Select the start date for the historical data. This option is available only for the historical mode. Sampling Increment Select whether you want to increment the sampling data based on time or count, and then specify the time or count, respectively. 
Note: The sampling increment may not always be honored. The maximum number of data points plotted on the trend chart is 3000 when sampling by time, and 8000 when sampling by count. You can zoom in to view more accurate data.Notes You can add notes only to historical trends, and not for OPC UA based trends. Switch the toggle to enable viewing or adding a note on the trend chart.
On the trend chart:- To add a note for the first time for a specific
data point, select the data point, and then select
. - To access a note, select
. Note: You cannot modify or delete a note; if you want to augment a note, you can add additional notes. - To add an additional note for a data point,
select
. - To navigate through multiple notes, use
and
.
When you access an existing note, the timestamp and tag values that appear during the initial loading of the note correspond to the x-axis and y-axis values for the data point, respectively. If you select each individual note, the actual raw and timestamp values to which the comment was added in the Historian archive appear.
If you add a note to an interpolated value, it is added to the nearest raw value. Due to this, the value displayed in the note may not always match the value plotted on the chart.
Sources Data can be plotted to the trend chart using properties from an asset model. In the absence of an asset model, you can also directly browse the data source address space and select tags for the trend chart. Select Add Tags for Trend to select the properties or tags that you want to add to the trend chart.
Tags marked as
are from the Historian data source. Tags marked as
are from the real time data
sources such as iFIX, CIMPLICITY, and any other OPC UA
server.Note: Nodes only work for plotting historical data. They do not work in Live mode.SAMPLING MODE For each tag SOURCE, you can add multiple sampling modes. This option is available only for the historical mode. Select [Add Sampling Mode] to add additional sampling modes for a tag. For example, you can have 3 different sampling modes for a single tag in the trend chart. Highlight each mode with a different line color, style, and thickness.
These are the modes available to plot data:
- Trend To Raw
- Minimum
- Maximum
- Average
- Total
- Standard Deviation
- Interpolated
- Lab
- Lab To Raw
You can trend each tag-sampling mode combination only once. For example, if Trend To Raw mode is applied to Water Temp tag, this mode becomes inactive for this tag. The other modes are available to use.
To delete a plotted sampling mode, select
next to the
tag.Specification Limits Select to define upper, lower, and targeted limits to monitor the process performance. 
Enter values for all or any of the limits to plot these lines on the trend chart. You can highlight each plotted line with a unique line color, thickness, and/or style.
You can set the specification limits for both live and historical mode, and save the chart to favorites.
COLOR Select to color code each trend line for unique identification. LINE WEIGHT Select to highlight each trend line with a unique line width. LINE STYLE Select to highlight each trend line with a unique line style.
