This function assigns a project tag to a trend group.

Function Group Execution Windows Embedded Thin Client Mobile Access
TagsDBSetTrend Tags Database Synchronous Supported (see “Notes” below) Not supported Not supported Not supported


  TagsDBSetTrend( strTagName, numProperty, strOrNumVal )  
Web Studio Help tions tagsdb tagsdbsettrend.xml d447827e119 TagsDBSetTrend
The name of the project tag to assign to the trend group.
The specific property to be set, identified by one of the following values:
Value Property Data Type
0 Trend group (or worksheet) number Integer
1 Log dead band Real
The value to set to the specified property. The value must be of the appropriate data type.

Returned value

This function returns one of the following possible values:
Value Description
-4 Project tag (as specified by strTagName) does not exist.
-3 Wrong parameter type or inconsistent value.
-2 Invalid number of parameters.
-1 The function TagsDBBeginEdit was not executed successfully before this function was called.
0 Function executed successfully.


The following restrictions apply to the execution of this function:
  • The function can only be executed on the project server — it cannot be called by a Graphics Script, Screen Script, or Command animation running on a project client;
  • The function TagsDBBeginEdit must have been executed previously, in order to lock the tags database for editing; and
  • The function TagsDBEndEdit must be executed when the editing is finished, in order to release the tags database and resume normal run-time operations.

For more information about the Tags Database functions and examples of how to use them, see Edit the tags database during run time.

Note: A specific project tag can be in only one trend group at a time. Therefore, when you assign a project tag to a trend group, it will be removed automatically from its previous group, if any.

Also, make sure that a trend group with the correct group/worksheet number actually exists before you try to assign a project tag to it.

Finally, new trends will not start recording until either the system clock changes to a new day or you restart the project.