FPGA I/O Node

Use an FPGA I/O Node configured for reading with this device.

Note You can synchronize an NI 9231 with other modules that have a selectable timebase source.

Terminals in Software

Table 222. Terminals in Software
Terminal Description
AIx AI input channel x, where x is the number of the channel. The NI 9231 has AI channels 0 to 7. Do not access AI channels on multiple modules in the same FPGA I/O Node if the modules are not synchronized or do not use the same data rate.
Onboard Clock Gives access to the onboard clock in the LabVIEW block diagram. The Onboard Clock frequency is 13.1072 MHz. Use the FPGA I/O Node in a single-cycle Timed Loop to access this channel. Export the Onboard Clock of the NI 9231 to access this channel.
Start Channel that controls when the module starts acquiring data.

To acquire data, write TRUE to the Start channel.

When the module is acquiring data, write TRUE to the Stop channel before you can access properties or TEDS information for the module. No operation is performed when writing FALSE to the Start channel.

Stop Channel that controls when the module stops acquiring data.

To stop acquiring data, write TRUE to the Stop channel.

When the module is acquiring data, write TRUE to the Stop channel before you can access properties for the module. No operation is performed when writing FALSE to the Stop channel.

Arbitration

This device supports only the Arbitrate if Multiple Requestors Only option for arbitration. You cannot configure arbitration settings for this device.

Methods

To access the following method for this device, use the FPGA I/O Method Node.

Table 223. Module Methods
Method Description
Check Cached Status Returns Booleans for each channel that indicate whether there was a short circuit or open loop on the channel since the last execution of the Check Cached Status method. When the FPGA I/O Node reads the channels, the FPGA VI determines the state of the channels and caches any TRUE value until the Check Cached Status method executes.
  • Short Circuit—Returns an array of Boolean values. A value of TRUE in any index indicates that the channel sharing a number with that index detected a short circuit on the channel at some point after the last time that the Check Cached Status method executed.
  • Open Loop—Returns an array of Boolean values. A value of TRUE in any index indicates that the channel sharing a number with that index detected an open loop on the channel at some point after the last time that the Check Cached Status method executed.

I/O Properties

To access the following I/O properties for this device, use the FPGA I/O Property Node.

Table 224. I/O Properties
Property Description
Input Configuration Sets the input configuration of the corresponding channel to one of three modes: AC coupled, DC coupled, or IEPE AC coupled.

Module Properties

Use the FPGA I/O Property Node to access the following module properties for this device.

Table 225. Module Properties
Property Description
Data Rate Sets the rate at which the module acquires data.
Module ID Returns the module ID.
Serial Number Returns the unique serial number of the module.
Vendor ID Returns the NI vendor ID, 0x1093.

Single-Cycle Timed Loop

This device does not support the single-cycle Timed Loop.