Analog Output Express VI
- Updated2023-02-21
- 3 minute(s) read
Requires: myRIO Toolkit or roboRIO Toolkit
Writes values to one or more analog output channels on the myRIO or the roboRIO.
This Express VI writes one sample each time with the default FPGA personality on the myRIO. This Express VI writes one sample or multiple samples each time with the high-throughput FPGA personality on the myRIO. Visit ni.com/info and enter the Info Code ex6g5a to learn about the myRIO high-throughput FPGA personality.
This Express VI writes one sample each time with the default FPGA personality on the roboRIO.
| Dialog Box Options |
| Block Diagram Inputs |
| Block Diagram Outputs |
Dialog Box Options
| Parameter | Description |
|---|---|
| I/O mode | (myRIO Toolkit) Specifies to write one sample or multiple samples. The default is Analog output (1 sample). This option is available only when you use the myRIO high-throughput FPGA personality. |
| Node name | Specifies the name of this Express VI. You can also double-click the name of this Express VI on the expandable node to edit the name. |
| Channel | Specifies the analog output channel to which to write a value. |
| Custom channel name | Specifies a custom name for the analog output channel that you select. |
| Delete Channel | Deletes the analog output channel that you select. (myRIO Toolkit) If you use the myRIO high-throughput FPGA personality, this option is available only when you specify Analog output (1 sample) for I/O mode. |
| Add Channel | Adds a new analog output channel to the channel list. You can add up to eight analog output channels for the myRIO. You can add up to two analog output channels for the roboRIO. (myRIO Toolkit) If you use the myRIO high-throughput FPGA personality, this option is available only when you specify Analog output (1 sample) for I/O mode. |
| Sample rate | (myRIO Toolkit) Specifies the sampling frequency of the output signal. Valid values are between 1 kHz and 80 kHz. If you specify a frequency that is invalid, this Express VI coerces the specified value to the nearest valid value when you click the Validate button. This option is available only when you use the myRIO high-throughput FPGA personality and specify Analog output (n samples) for I/O mode.
|
| Wait until done? | (myRIO Toolkit) Specifies whether this Express VI waits until the write operation completes. If the Wait until done? checkbox contains a checkmark, this Express VI waits until the write operation completes. By default, this checkbox does not contain a checkmark. This option is available only when you use the myRIO high-throughput FPGA personality and specify Analog output (n samples) for I/O mode. |
| Latency | (myRIO Toolkit) Displays the latency between two adjacent signal generation iterations. Refer to the Details section of this topic for more information about latency. This option is available only when you use the myRIO high-throughput FPGA personality and specify Analog output (n samples) for I/O mode. |
| View Code | Displays the underlying code of this Express VI. |
| Connection Diagram | Shows the I/O connector pinouts on the myRIO or the roboRIO. The highlighted pinouts represent the channels that you configure. |
Block Diagram Inputs
| Parameter | Description |
|---|---|
| channel name | Specifies the value to write to the analog output channel that you select, where channel name is the name of the analog output channel. |
| error in (no error) | Describes error conditions that occur before this node runs. |
Block Diagram Outputs
| Parameter | Description |
|---|---|
| error out | Contains error information. This output provides standard error out functionality. |
Analog Output Details
(myRIO Toolkit) The following figure demonstrates the latency when you use the Analog Output Express VI with the myRIO high-throughput FPGA personality to perform n samples write operations.
In the previous figure, the x-axis represents time and the y-axis represents amplitude. The time interval between two adjacent signal generation iterations is latency. In other words, the myRIO does not export signals when latency occurs.
Related Information
1 Sample versus N Samples Modes (myRIO Toolkit)
Generating FPGA Clocks (myRIO Toolkit)
Generating FPGA Clocks (roboRIO Toolkit)
I/O Connectors (myRIO Toolkit)
I/O Connectors (roboRIO Toolkit)
Latency in N Samples Read and Write Operations (myRIO Toolkit)