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NI 9226 (Scan Interface)

NI CompactRIO Device Drivers Help

Edition Date: December 2017

Part Number: 373197L-01

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CompactRIO 8-Channel, 24-Bit, 1000 Ω RTD Analog Input Module

Module I/O Variables

To use I/O from this module in a VI, drag and drop I/O variables from the Project Explorer window to the block diagram of the VI. The I/O variables for the channels return calibrated floating-point data in units as specified on the C Series Module Properties dialog box.

Module Channels

The NI 9226 has the following channels.

Channel Description
RTDx RTD input channel x, where x is the number of the channel. The NI 9226 has RTD channels 0 to 7.

C Series Module Properties Dialog Box

Use this dialog box to configure the NI 9226. Right-click the NI 9226 in the Project Explorer window and select Properties to display this dialog box. You can configure the following options.

  • Name—Specifies the name of the C Series module, which appears in the Project Explorer window. LabVIEW assigns a default name to the module based on the slot number. You can use this field to give the module a descriptive name.
  • Module Type—Specifies the type of C Series module. You cannot change this value.
  • Location—Specifies a slot in the chassis for the C Series module.
  • Conversion Time—Specifies the time it takes to acquire one point of data from all channels. You can select 200 ms or 2.5 ms.
  • Channels—Specifies the channel(s) for which you want to configure settings.
  • Measurement Units—Specifies the units you want data to be returned in for the channel. You can select Raw Ohms, Degrees Kelvin, Degrees Celsius, Degrees Fahrenheit, or Degrees Rankine.
  • RTD Type—Specifies the type of RTD connected to the channel by temperature coefficient of resistance (TCR). If you select Custom, you must enter the Callendar-Van Dusen Coefficients below.
    • Callendar-Van Dusen Coefficients—Specifies the coefficients to use in the Callendar-Van Dusen equation, a linearization curve for measuring the temperature of an RTD.


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