Table Of Contents

Write Tag (G Dataflow)

Last Modified: March 15, 2017

Writes a data value to a tag.

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tag ref in

The reference to the tag you want to write a data value to.

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value

The data value that this node writes to the tag.

This input accepts any data type.

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timestamp

The timestamp you want to associate with the data value that this node writes to the tag.

This input is available only if you enable the Has Timestamps? property of the tag. In order to associate a timestamp with the data, you must enable the Has Timestamps? property of the tag.

If you do not wire this input and Has Timestamps? is enabled, this node automatically generates the current timestamp and associates it with the data value in the tag.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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tag ref out

The reference to the tag that this node wrote a data value to.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

What is a Tag?

A tag can store a single value of any data type. Tags are similar to global variables in text-based programming languages. You can create a tag to access the same data from multiple VIs within a project.

Creating and Configuring a Tag

Complete the following steps to create and configure a tag.

  1. Create or open a shared resource collection document.
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    Note  

    Shared resource collection documents have the .grsc file extension.

  2. Expand the Tag section and click Create New.
  3. Configure the data type, initial value, and other properties of the tag in the Item tab.

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices


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