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Ewon Talk2m Visualization

Advanced Tag Management

Manage Your Tags

While most of your tags will come from your Ewon Flexy, you might wish to create internal tags. An internal tag will get its value from the initial value property or from an Expression.

  1. Modifying Tags:

    Tags are managed at the Controller level of your machine or template.

    1. To add, delete, or modify tags, navigate to the Configuration menu.

    2. Expand your Machine or Template menu to find your Controller.

    3. Select the Tags screen.

    4. Select the Edit menu to use the Add Tag or Delete Selected Tags commands and to make the tag fields editable.

  2. Tag Parameters:

    1. Standard Parameters

      The standard tag parameters displayed on the tag screen include:




      Name of tag. Used to identify tags in widgets

      Short Name

      Short name that will be displayed in some widgets


      Tag name on the Ewon Flexy

      Data Type

      Data type of tag in Ewon Flexy


      If tag is stored in the database and historical data can be shown in widgets and reports


      Checked if the tag is read from the Ewon Flexy

      Enabled Condition

      A condition that is evaluated to determine if the Flexy tag should be read

      Read only

      Default checked. Uncheck this field if you will update this tag's value through an expression

      Write authentication

      Uncheck this field if you will update this tag's value through an expression


      Unit of value. Will be displayed in some widgets

      Number of decimals

      Number of decimal places to display in widgets


      Description of tag

    2. Scaling Parameters

      Use the Scaling fields to adjust how the tag values from the Ewon Flexy are scaled.


      The offset gain value affects the values with the following formula: Value = Offset + (Gain * ReadValue)


      You can also add maximum and minimum value limits:

      CalculatedGain = Abs(ScaledMax - ScaledMin) / Abs(Max-Min)

      ScaledValue = ReadValue * CalculatedGain * Gain

      Value = ScaledValue + ScaledMin + Offset

      Toggle the Scaling switch to display or hide the scaling parameters.




      Minimum value for the read tag value


      Maximum value for the read tag value

      Scaled min

      Minimum value after scaling

      Scaled max

      Maximum value after scaling


      Gain multiplied with the read tag value. Default value is 1


      Offset added to the read tag value. Default value is 0

    3. Advanced Parameters

      Toggle the Advanced switch to display or hide the advanced parameters.




      Used to identify if a value has changed. Options: None, Absolute, or Percent

      Deadband value

      Amount of change to trigger a new value change event

      External ID

      Internal tag ID from the Ewon Flexy. Empty for internal tags

      Aggregate length

      The time frame used for aggregated data. It can be used for visualizing data in the trend widget and for calculations.

      Initial value

      Initial value for internal tags. Empty for tags from the Ewon Flexy


      Used to indicate if a tag can be used in an expression. Default unchecked.

      Must be checked for a tag that will used in an expression OR updated by an expression


      Click to bring up the expression editor

  3. Monitoring Tags:

    Users with sufficient access rights can also use the Monitor option to see current tag values and their update times.

    1. Toggle the Monitor switch to display or hide the monitoring fields.



The Time field indicates the time when the data visualization extension read the value from the Ewon Flexy.

It does not indicate the time the value was read from the PLC.

Create Expressions

Expressions are calculations that are applied to a tag value.

By using expressions, you can make a tag more meaningful to a user or combine the information from one tag with that of another.

You can either create a new internal tag if you want to store the calculated data or add it to an existing tag if you don't want to store the original value.

  1. Create an Expression:

    1. To create a new Expression, navigate to the Configuration page.

    2. Expand your Machine or Template menu to find your Controller.

    3. Select the Tags screen.

    4. Toggle Show Advanced.

    5. Mark the tags that you will reference in an expression as Expressionable.


      The tag that will hold the result of the expression needs to have the Read Only parameters and the Write Authentication parameters unchecked.

      It will also need to be marked as Expressionable.

    6. Click on the Expression field to bring up the expression editor.

    7. Once the expression is built, use the Test Expression button to check that it works as expected.

    8. Click the Save button to save your Expression.

  2. Examples:

    1. Sum of Two Tags

      You can modify the If/Else conditions if you click on the Settings button.

    2. Is Running Based on Power Consumption


Configure Alarms and Events

While you can configure Alarms and Alarm Notifications on your Ewon Flexy, those events might not be the ones you want the users of the data visualization extension to see. You can create separate events within the extension.

Events can be divided into two categories:

  • Alarm Events

    Alarm events appear in the Alarm widget of the dashboard.

  • Service Events

    Service events appear in the Service Log widget of the dashboard. They are entered manually.

Events can be generated automatically based on the value of a tag from your Ewon Flexy or they can be entered manually.

  1. Event Management:

    1. To configure an Event, navigate to the Configuration menu.

    2. Select your Machine or Template to configure.

    3. Select the Alarms & Events tab.

    4. Select the Edit menu.

    5. From here, you can add, modify or delete selected Events.

    The Event parameters include:




    Type of event. Possible values include Alarm and Service


    Name of the event. Used to identify event in widgets


    Text of event item displayed in widget


    Text of event item displayed in alarm or service detail widget


    Trigger condition. Possible values include GreaterThan, LessThan, EqualTo,NotEqualTo, Unchanged

    Not used for manually entered alarms


    Trigger value


    If Condition is Unchanged, the delay is the amount of time since the tag was last changed before an event is triggered

    For other conditions, it is the amount of time the condition must be true before the event is triggered


    Image shown in event detail widget


    Icon shown in event list widget


    Severity of the event. Possible values: Alarm, Debug, Event, Information, Warning

    Acknowledge enabled

    Checked if event needs to be acknowledged before it is moved to the history list


    Tag to evaluate for this event condition. Leave this field blank for manually entered events

    Enabled condition

    A tag that enables/disables the event

  2. Service Events:

    Service Events are selected by the user from a list of Service Types.

    1. To configure an Event, navigate to the Configuration menu.

    2. Select your Machine or Template to configure.

    3. Select the Service tab.

    4. Click on the Edit menu.

    5. To add a type, click the Add Type button. A new type will be added.

    6. Click on each field to configure the event.


    Service Events can also be configured in the Service Log widget from the dashboard Configuration page.


    If you wish to delete a service type, click on the Delete icon next to the Service Type.

The Service Type parameters include:




Icon shown in the service log widget


Name of service type displayed in widget


Text of service type displayed in widget


Description of service type displayed in widget