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Edge HMI

TagsDBSetTrend

  • Last UpdatedOct 29, 2026
  • 2 minute read

This function assigns a project tag to a trend group.

Function

Group

Execution

String Exp.

Windows

Windows Embedded

IoT View

Thin Clients

Mobile Access

TagsDBSetTrend

Tags Database

Synchronous

No

Supported (see Notes below)

Not supported

Not supported

Not supported

Not supported

Syntax

TagsDBSetTrend( strTagName, numProperty, strOrNumVal )

TagsDBSetTrend ( strTagName , { numProperty | 0 | 1 } ,strOrNumVal)

strTagName

The name of the project tag to assign to the trend group.

numProperty

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

strOrNumVal

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.

Notes

The following restrictions apply to the execution of this function:

  • The function can be executed only on the project runtime server — it cannot be called by a Graphics Script, Screen Script, or Command animation running on a thin client;

  • The TagsDBBeginEdit function must have been executed previously, in order to lock the tags database for editing; and

  • The TagsDBEndEdit function must be executed when the editing is done, in order to release the tags database and resume normal runtime operations.

For more information about the Tags Database functions and examples of how to use them, see Using TagsDB functions to 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.

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