NI 9219 (Scan Interface)
CompactRIO 4-Channel, 24-Bit Universal 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 or Boolean data in units determined by the measurement mode you select on the C Series Module Properties dialog box. The following table shows the units for the different modes.
| Mode | Data Units |
|---|---|
| Voltage | Volts |
| Current | Amps |
| Resistance | Ohms |
| Thermocouple | Volts or Temperature Units |
| RTD | Ohms or Temperature Units |
| Bridge | Volts/Volt |
| Digital In | Boolean |
| Open Contact | Boolean |
Module Channels
The NI 9219 has the following channels.
| Channel | Description |
|---|---|
| CHx | Analog input channel x, where x is the number of the channel. For the NI 9219, x is 0 to 3. |
C Series Module Properties Dialog Box
Use this dialog box to configure the NI 9219. Right-click the NI 9219 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.
- Channels—Specifies the channel(s) for which you want to configure settings.
- Mode—Specifies the measurement mode for the selected channel(s).
- Range—Specifies the range for the selected channel(s).
- Type—Specifies the type of thermocouple connected to a channel in thermocouple mode.
- Measurement Units—Specifies the units for data to be returned from the selected channel(s) configured for thermocouple or RTD mode.
- Threshold—Specifies the minimum high level in volts for the selected channel(s) configured for Digital In mode. The range of valid threshold values is 0–60.
- Conversion Time—Determines the time it takes to read all channels of the module. You can select High Speed, Best 60 Hz Rejection, Best 50 Hz Rejection, or High Resolution. Refer to the NI 9219 Operating Instructions and Specifications for more information about these conversion times.
Hardware Documentation
Refer to the NI 9219 Operating Instructions and Specifications to learn about module specifications and how to use the module. Refer to the CompactRIO Related Documentation (Scan Interface) topic for further information about CompactRIO documentation.