National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — SCXI_Track_Hold_Control

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 National Instruments Corporation

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NI-DAQ FRM for PC Compatibles

Controls the track/hold state of an SCXI-1140 module that you have set up for a 
single-channel operation.

moduleSlot is the chassis slot number of the SCXI-1140 module you want.

Range:

1 to n, where n is the number of slots in the chassis.

state indicates whether to put the module into track or hold mode.

0:

Put the module into track mode.

1:

Put the module into hold mode.

DAQdeviceNumber is the device number of the DAQ device that will perform the channel 
scanning operation. If you are using the SCXI-1200 to perform the data acquisition, you 
should specify the module logical device number. 

Refer to the SCXI Application Hints discussion in Chapter 3, Software Overview, of the 
NI-DAQ User Manual for PC Compatibles for information about how to use the SCXI-1140 
for single-channel and channel-scanning operations. This function is only needed for 
single-channel applications; the scan interval timer controls the track/hold state of the module 
during a channel-scanning operation. The NI-DAQ User Manual for PC Compatibles 
contains flowcharts for single-channel operations using the SCXI-1140 and this function.

i16

logical ID assigned to the SCXI chassis

i16

chassis slot number

i16

track or hold mode

i16

device number of the DAQ device used to read 
the input channel