Table Of Contents

Destroy Tag/Proxy (G Dataflow)

Version:
Last Modified: January 12, 2018

Deletes a tag or tag proxy reference.

When you destroy a tag, tag proxy references linked to that tag enter an error state. Reading the tag proxy reference returns the last known value, but writing to the tag proxy returns an error.

When you destroy a tag proxy reference, the state of the tag to which the tag proxy is linked does not change.

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tag/proxy ref in

The tag endpoint or tag proxy endpoint you want to delete.

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error in

Error conditions that occur before this node runs. With the following exception, this input provides standard error in functionality. This node executes even if an error occurred before this node runs.

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status

Boolean value that determines whether an error occurred before this node ran.

True (X) An error occurred before this node ran.
False (checkmark) An error did not occur before this node ran. Can also indicate a warning.

Default: False

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code

The error or warning code. If status is True, code is an error code. If status is False, code is 0 or a warning code.

Default: 0

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source

Origin of the error or warning. In most cases, this is the name of the node that produced the error or warning.

Default: Empty string

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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 is single-point, latest value data that you can access from multiple documents within a project. A tag can store a single value of any data type that represents the state of a process. Tags are similar to global variables in text-based programming languages.

You can create a tag either dynamically, using the Configure and Create Tag node on the diagram, or statically, in the shared resource collection file.

You can create a tag to access the same data from multiple VIs within a project.

What Is a Tag Proxy?

A tag proxy is a reference that is local to part of the application that mirrors the value of the actual tag to which it is linked in another location in the application. You use a tag proxy to access data that is in another location in the application. You can read from and optionally write to a tag proxy only after the tag proxy links to a tag.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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