NI 9227 (FPGA Interface)

NI CompactRIO Device Drivers Help

Edition Date: December 2017

Part Number: 373197L-01

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CompactRIO 4-Channel, 5 Arms, 24-Bit Simultaneous Analog Input Module

FPGA I/O Node

You can use an FPGA I/O Node, configured for reading, with this device.

Note  You can simultaneously read from or write to multiple channels on the NI 9227. You can also synchronize an NI 9227 module with other modules that have a selectable timebase source.

Terminals in Software

Use the FPGA I/O Node to access the following terminals for this device.

Terminal Description
AIx Analog input channel x, where x is the number of the channel. The NI 9227 has AI channels 0 to 3. 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 12.8 MHz. Use the FPGA I/O Node in a single-cycle Timed Loop to access this channel. You must export the Onboard Clock of the NI 9227 to access this channel.
Start Channel that controls when the NI 9227 starts acquiring data. If TRUE is written to the Start channel, the NI 9227 starts acquiring data. When the NI 9227 is acquiring data, you must write TRUE to the Stop channel before you can access properties for the module. If FALSE is written to the Start channel, no operation is performed.

Refer to the NI 9227 Getting Started VI in the labview\examples\CompactRIO\Module Specific\NI 9227\NI 9227 Getting Started\NI 9227 Getting Started.lvproj for an example of using the Start and Stop channels.

Stop Channel that controls when the NI 9227 stops acquiring data. If TRUE is written to the Stop channel, the NI 9227 stops acquiring data. When the NI 9227 is acquiring data, you must write TRUE to the Stop channel before you can access properties for the module. If FALSE is written to the Stop channel, no operation is performed.

Refer to the NI 9227 Getting Started VI in the labview\examples\CompactRIO\Module Specific\NI 9227\NI 9227 Getting Started\NI 9227 Getting Started.lvproj for an example of using the Start and Stop channels.

Arbitration

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

Methods

This device does not support any methods.

I/O Properties

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

Property Description
LSB Weight Returns the LSB weight in pA/LSB for the channel. Use this value to convert and calibrate NI 9227 data if you set the Calibration Mode to Raw in the C Series Module Properties dialog box.
Offset Returns the calibration offset in nA for the channel. Use this value to convert and calibrate NI 9227 data if you set the Calibration Mode to Raw in the C Series Module Properties dialog box.

Module Properties

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

Property Description
Data Rate Sets the rate at which the NI 9227 acquires data.
Module ID Returns the module ID, 0x7416.
Serial Number Returns the unique serial number of the module.
Vendor ID Returns the NI vendor ID, 0x1093.

Single-Cycle Timed Loop

You can use the Onboard Clock channel in the single-cycle Timed Loop. You cannot use the other channels on the NI 9227 with the single-cycle Timed Loop. Refer to the Understanding Loop Timing (FPGA Interface) topic for information about loop timing for this module.

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