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DAQmx Create Virtual Channel (Analog Input » RTD) (G Dataflow)

Version:
    Last Modified: February 6, 2017

    Creates channel(s) that use an RTD to measure temperature.

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    task in

    task in specifies the task to which to add the virtual channels this node creates. If you do not specify a task, NI-DAQmx creates a task for you, and adds the virtual channels this node creates to that task.

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    physical channels

    physical channels specifies the names of the physical channels to use to create virtual channels. The DAQmx physical channel constant lists all physical channels on devices and modules installed in the system.

    You can also wire a string that contains a list, or range of physical channels, to this input. If you have an array of physical channels, use the DAQmx Flatten Channel String node to convert the array to a list.

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    name to assign

    name to assign specifies a name to assign to the virtual channel this node creates. If you do not wire a value to this input, NI-DAQmx uses the physical channel name as the virtual channel name.

    If you use this input to provide your own names for the virtual channels, you must use the names when you refer to these channels in other NI-DAQmx nodes, such as the source input of the DAQmx Trigger node.

    If you create multiple virtual channels with one DAQmx Create Virtual Channel node, you can specify a comma-separated list of names to assign to the virtual channels. If you provide fewer names than the number of virtual channels you create, NI-DAQmx automatically assigns names to the virtual channels.

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    units

    units specifies the units to use to return temperature measurements.

    Name Description
    deg C

    Degrees Celsius.

    deg F

    Degrees Fahrenheit.

    deg R

    Degrees Rankine.

    From Custom Scale

    Units a custom scale specifies. If you select this value, you must wire a custom scale name to the custom scale name input.

    K

    Kelvins.

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    error in

    error in describes error conditions that occur before this node runs. This input provides standard 'error in' functionality.

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    measurement range

    measurement range specifies the minimum and maximum values you expect to measure.

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    maximum value

    maximum value specifies in units the maximum value you expect to measure.

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    minimum value

    minimum value specifies in units the minimum value you expect to measure.

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    resistance configuration

    resistance configuration specifies the number of wires to use for resistive measurements.

    Name Description
    2-Wire

    2-Wire mode.

    3-Wire

    3-Wire mode.

    4-Wire

    4-Wire mode.

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    current excitation

    current excitation specifies the source of excitation.

    Name Description
    External

    Use an excitation source other than the built-in excitation source of the device. If you select this value, you must use the current excitation value input to specify the amount of excitation.

    Internal

    Use the built-in excitation source of the device. If you select this value, you must use the current excitation value input to specify the amount of excitation.

    None

    Supply no excitation to the channel.

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    current excitation value

    current excitation value specifies in amperes the amount of excitation to supply to the sensor. Refer to the sensor documentation to determine this value.

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    rtd type

    rtd type specifies the type of RTD connected to the channel.

    Name Description
    Custom

    You must use the Analog Input:Temperature:RTD:Custom:A, Analog Input:Temperature:RTD:Custom:B, and Analog Input:Temperature:RTD:Custom:C properties to supply the coefficients for the Callendar-Van Dusen equation.

    Pt3750

    Pt3750.

    Pt3851

    Pt3851.

    Pt3911

    Pt3911.

    Pt3916

    Pt3916.

    Pt3920

    Pt3920.

    Pt3928

    Pt3928.

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    task out

    task out is a reference to the task after this node runs. The task contains any newly created virtual channels. If you did not wire a value to task in, NI-DAQmx automatically creates the task this output refers to.

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    r0

    r0 is the sensor resistance in ohms at 0 degrees Celsius. The Callendar-Van Dusen equation requires this value. Refer to the sensor documentation to determine this value.

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    error out

    error out contains error information. If error in indicates that an error occurred before this node ran, error out contains the same error information. Otherwise, error out describes the error status that this node produces.

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: LabVIEW NXG does not support FPGA devices


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