Open and Verify Variable Connection (G Dataflow)

The number of elements to include in the client-side buffer for the variable connection.

If you wire a value of 2 or greater to this input, the node creates a read buffer, a write buffer, or both, depending on the read and write access settings you specify using the access input. If you wire a 0 to this input, the node uses the access input value you specify without buffering. If you wire a value of 1 to this input, the node returns an error.

Default: 0—Specifies no buffering

The reference to the PSP variable.

The data type of the PSP variable.

If you specify the data type using shared variable refnum in, this node removes the data type input. If you specify the data type upon opening the connection, this input is unavailable for subsequent read nodes.

Time, in milliseconds, that the node waits before timing out. The operation aborts if it does not complete within timeout ms. To disable timeouts, set timeout ms to -1.

Default: 0

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

Read access and write access settings for the PSP variable.

Read Access

Read access settings.

Name	Description
Allowed	You can use the variable connection to read the value of the PSP variable.
Required	You can use the variable connection to read the value of the PSP variable. If you select this option and cannot open the variable connection for reading, the node returns an error.
None	You cannot use the variable connection to read the value of the PSP variable.

Write Access

Write access settings.

Name	Description
Allowed	You can use the variable connection to write to the PSP variable.
Required	You can use the variable connection to write to the PSP variable. If you select this option and cannot open the variable connection for write, the node returns an error.
Denied	You cannot use the variable connection to write to the PSP variable.

The reference to the PSP variable.

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.