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How to

How to


Products: AS-B, Edge Server, Enterprise Central, Enterprise Server, AS-P, WorkStation, Virtual Project Servers
Functionalities: Trends
Product version: 2023, 2024
12/17/2022

Configuring a Trend Chart

You configure the properties of a trend chart to meet the unique needs of your site.

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​A trend chart displays the records of a trend log or an extended trend log as a series.

A trend chart series that presents a trend log is automatically updated with the latest records, if Live update in WorkStation or Automatic scroll in WebStation is activated. A trend chart series that presents records from a field controller trend log needs to be refreshed manually.

There is no upper limitation of how many trend logs a trend chart can present. However, the performance decreases as the number of displayed trend logs increase. The records of the trend log can be processed by a calculation method before they are presented in the trend chart. The calculation function supports negative consumption values, which can be used to handle cases where you need to subtract consumption for, for example, energy produced on site.

 
action_zoom_plus_stroke Trend chart, schematic

Trend chart, schematic

When a trend chart presents records live from an extended trend log, the latest records of the connected trend log are frequently transferred to the extended trend log. This decreases the delay that can occur when the extended trend log has to wait for the transfer threshold to be reached before new records from the trend log are transferred. With this method, the trend chart presents the latest records.

 
action_zoom_plus_stroke An extended trend log, that presents in an opened live trend chart, frequently transfers the latest records from the trend log to the extended trend log.

An extended trend log, that presents in an opened live trend chart, frequently transfers the latest records from the trend log to the extended trend log.

If two extended trend logs are connected between the trend log and the trend chart, the transfer that occurs when a trend chart presents records live only transfers the records from the nearest extended trend log. The transfer threshold rate between the trend log and the first connected trend log remains unaffected.

 
action_zoom_plus_stroke Latest trend log record that does not present the same short latency in a live trend chart when two extended trend logs are connected in a series between the trend log and trend chart.

Latest trend log record that does not present the same short latency in a live trend chart when two extended trend logs are connected in a series between the trend log and trend chart.

When waiting for a new record, the trend chart draws a dotted line from the last recorded value and forward. When a new value is recorded, the dotted line between the last and the new record is replaced by a solid series of lines.

 
action_zoom_plus_stroke If no value is recorded, the trend chart draws a dotted line.

If no value is recorded, the trend chart draws a dotted line.

Dynamic Trend Chart Title

Trend charts support relative property references for the trend chart title. You can reuse the trend chart and have the trend chart title dynamically changed depending on where you paste a copy, make a duplicate, import, or move the trend chart. The Chart title property of the trend chart is the first part of the trend chart title and the Description property of the trend chart is the last part of the trend chart title. For example, in a relative property reference: '../../NAME' where '../' represents a folder or container object.

If the Chart title property is empty or contains an unresolved reference, the trend chart object name is the first part of the trend chart title.

The trend chart title is visible in trend chart printouts.

Trend Chart Series

In a trend chart, a series can be presented as a line, discrete line, digital, or bars. In a trend chart, series can be presented in different colors and with different line weights.

In WorkStation, in a multi trend log list, series are presented as text and can be exported to .XML or .CSV.

For more information, see Trend Series .

Trend Chart Axes in WorkStation

​The x-axis of the trend chart represents time. The time span of the axis can be set with a fixed start and end time or with an end time relative to the present time. The axis can be quick-scaled to show the last hour, last day, last month, or last year.

For more information, see Trend Chart Axes .

Trend Chart Axes in WebStation

​The x-axis of the trend chart represents time. The time span of the axis can be set with a fixed start and end time or with an end time relative to the present time. The axis can be quick-scaled to show the last hour, last day, last month, or last year.

For more information, see Trend Chart Axes in WebStation .

Real-Time Plotting

The real-time plot is a variable displayed directly in the trend chart. The real-time plot is an instant reflection of the variable, so the history of the real-time plot is lost when the trend chart is closed. However, the history is not lost for I/O points that have implicit logs where approximately 500 records of history are displayed.

For more information, see Real-Time Plotting .

Time Zone Modes in a Trend Chart

​In a trend chart, you can present the records of a trend log in different time zones: local time or a predefined time zone.

For more information, see Time Zone Modes in a Trend Chart .

Calculation Methods

​Use a calculation method to process the records of the trend log before presenting them in a trend log list or a trend chart. The original records in the trend log are not affected by the calculation method. The calculation method is applied to the trend log records grouped by a specific time interval.

For more information, see Calculation Methods .

Period Timestamps in Trend Charts and Trend Log Lists

When a calculated value for a period is presented, the middle of the period is used as the timestamp.

Example:

The calculated value for the period 8:00-9:00 is stamped 8:30. If there is a value at 9:01, the next period is 9:00-10:00, which is stamped as 9:30. The full period may not have passed yet, but the value can be presented even if parts of the period are in the future.

Temporary Trend Charts

​To display a trend log without creating a new trend log list or trend chart, the trend log can be displayed in a temporary list or chart.

For more information, see Temporary Trend Charts .

Multi Trend Log Lists

You can view a trend chart in a multi trend log list to be able to export it and print it. The trend chart series settings and calculation are retained in the multi trend log list.

For more information, see Multi Trend Log Lists .

Floating Point Values NaN, INF, and –INF

In the EcoStruxure Building Operation software, the floating point values “Not a Number”, positive infinity, or negative infinity may be displayed in the Basic property tab, in a trend log list, or a trend chart.

For more information, see Floating Point Values NaN, INF, and –INF .

To configure a trend chart
  1. In WorkStation, in the System Tree pane, select the trend chart you want to configure.

  2. On the File menu, click Properties .

  3. In the properties dialog box, click the Basic tab.

  4. Edit the basic properties:

    Table: Trend Chart Properties Table

    Property

    Description

    Time mode

    ​Select the time mode of the x-axis.

    Start time

    Enter the absolute start time when Time mode is set to Absolute . This time is the leftmost point of the x-axis.

    Time span

    Type the relative time span of the x-axis.

    Time zone

    Select the time zone of the trend log list. The mode is the perspective in which the trend log is displayed.

    Show nearest information for all series

    Select True to show information on every series along a diagonal line.

    Show grid lines for X-axis

    Select True to show grid lines for the x-axis.

    Chart title

    Enter the property reference or relative property reference to the folder or other container whose name you want to include in the trend chart title.

    Auto scale left y-axis

    Select True to activate auto scale and have the left y-axis adapt itself to the displayed series.

    Left y-axis minimum

    Enter the minimum value of the left y-axis.

    Left y-axis maximum

    Enter the maximum value of the left y-axis.

    Auto scale right y-axis

    Select True to activate auto scale and have the right y-axis adapt itself to the displayed series.

    Right y-axis minimum

    Enter the minimum value of the right y-axis.

    Right y-axis maximum

    Enter the maximum value of the right y-axis.

    Show grid lines for left Y-axis

    Select True to show gridlines for the left y-axis originating from the y-axis scale.

    Show grid lines for right Y-axis

    Select True to show gridlines for the right y-axis originating from the y-axis scale.

     
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    Add

    Click to add a series to the trend chart. For more information, see Create Object Dialog – Naming the Object Page .

     
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    Edit

    Click to edit a selected series. For more information, see Trend Chart Series Properties .

     
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    Remove

    ​Click to remove a selected series.

  5. Click the Series tab.

  6. Edit the series properties.

  7. Click OK .

  • Trend Charts
  • Trend Chart Properties
  • Trend Chart Does Not Show Trend Log Series