DAQmx Create Channel (AI-Temperature-Thermocouple) VI

cjc channel specifies the channel that acquires the temperature of the thermocouple cold-junction if you set cjc source to Channel.

You can use a global channel or another virtual channel already in the task. If the channel is a temperature channel, NI-DAQmx acquires the temperature in the correct units. Other channel types, such as a resistance channel with a custom sensor, must use a custom scale to scale values to degrees Celsius.

cjc source specifies the source of cold-junction compensation.

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

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

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

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 also can 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 VI to convert the array to a list.

name to assign specifies a name to assign to the virtual channel this VI 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 VIs and Property Nodes, such as the source input of the DAQmx Trigger VI.

If you create multiple virtual channels with one DAQmx Create Virtual Channel VI, 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.

units specifies the units to use to return temperature measurements.

error in describes error conditions that occur before this VI or function runs.

The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. If an error occurs while this VI or function runs, the VI or function runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

thermocouple type specifies the type of thermocouple connected to the channel. Thermocouple types differ in composition and measurement range.

cjc value specifies in units the temperature of the cold junction if you set cjc source to Constant Value.

task out is a reference to the task after this VI 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.

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

Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.