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How to

How to


Products: Automation Server, AS-B, Enterprise Server, AS-P, Virtual Project Servers
Functionalities: Trends
Product version: 1.9
5/4/2017

Configuring a Variable Triggered Trend Log

You configure the properties of a variable triggered trend log to meet the unique needs of your site.

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​The variable triggered trend log records the variable when the conditions of the associated trigger variable are met. Use this type of trend log when the log interval is scheduled to log monthly or yearly, or when another device is used to trigger the log.

For example, in the figure below, the variable triggered trend log records a variable every time the associated trigger variable, for example, a switch, changes to true. The records are printed in a trend chart. Notice that the variable triggered trend log records the variable without any regard to time or delta.

 
action_zoom_plus_stroke Variable triggered trend log schematic
Figure: Variable triggered trend log schematic

You can configure the trend log to collect data when the trigger value changes to True, changes to False, or All changes.

 
action_zoom_plus_stroke Trigger variable changes to true
Figure: Trigger variable changes to true
 
action_zoom_plus_stroke Trigger variable changes to false
Figure: Trigger variable changes to false
 
action_zoom_plus_stroke Trigger variable all changes
Figure: Trigger variable all changes

To configure a variable triggered trend log

  1. In WorkStation, in the System Tree pane, click the variable triggered trend log you want to configure.

     
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  2. Edit the properties:

    Table: Variable Triggered Trend Log Properties - Basic Tab

    Component

    Description

    Status

    Displays the status of the trend log.

    Enabled

    Displays True if the trend log is enabled.

    Logged variable

    Enter the variable you want to log.

    Delta

    Select the minimum value change that triggers a new record.

    Trigger variable

    Enter the variable that triggers the trend log to start recording.

    Trigger condition

    Select when you want the variable recorded: when the trigger variable changes to True, changes to False, or at all changes.

    For more information, see Variable Triggered Trend Logs .

    Log size

    Select the number of records to store before old records are overwritten, including internal records generated by the trend log.

    For more information, see Log Record Storage .

    Clear when enabled

    Select True to clear the trend log when it is enabled.

  3. Click the Save button

     
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    .

See Also

  • Variable Triggered Trend Logs
  • Variable Triggered Trend Log Properties
  • Configure Dialog Box – Configuration Tab
  • Variable Triggered Trend Logs
  • Configure Dialog Box – Operation Tab
  • Log Record Storage
  • Trend Log Does Not Start Record Due to the Start Condition