Table Of Contents
Destroy Tag/Proxy (G Dataflow)
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.
tag/proxy ref in
The tag endpoint or tag proxy endpoint you want to delete.
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.
status
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
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
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.
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.