RT FIFO Create (G Dataflow)

The number of elements in the array for each RT FIFO element. This input only applies if the RT FIFO elements are arrays. RT FIFOs do not support multi-dimensional arrays.

Default: 1

The number of elements in the RT FIFO.

Default: 10

The name of the RT FIFO that you want to obtain or create.

Default: Empty string

Defines the type of data that you want the RT FIFO to contain. RT FIFOs do not support data types of variable size, such as clusters, strings, and variants. RT FIFOs also do not support multi-dimensional arrays.

A Boolean that determines whether to create a new RT FIFO if the FIFO specified by name does not currently exist.

Default: True

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

The number of datapoints for every element of the array of waveforms. This input only applies if the RT FIFO elements are waveforms.

Default: 1

Read and write modes for a new RT FIFO. The read and write modes define the behavior of an RT FIFO that reads a value from an empty RT FIFO or writes a value to an RT FIFO that does not have an empty slot. You can specify one of the following modes for reads and writes:

• polling—Optimizes the throughput performance of read and write operations by continually polling the RT FIFO for new data or an open slot. The polling mode responds quicker than the blocking mode to new data or new empty slots, but requires more CPU overhead. Use timeout in ms of RT FIFO Read or RT FIFO Write to specify the amount of time that a write operation should poll for an empty slot or a read operation should poll for new data.
• blocking—Optimizes the utilization of the CPU during read and write operations by allowing the thread of the VI to sleep while it waits, allowing other tasks in the system to execute. Use timeout in ms of RT FIFO Read or RT FIFO Write to specify an amount of time that a read operation can wait for a new value or a write operation can wait for an empty slot.

If you use RT FIFO Create to return a reference to an existing RT FIFO, the reference uses the read and write modes of the existing RT FIFO and ignores the modes specified with r/w modes.

read mode

Read mode for the RT FIFO.

write mode

Write mode for the RT FIFO.

References an existing or newly created RT FIFO.

A Boolean that indicates whether the node created a new FT FIFO.

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.