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LabVIEW – DAQ, Sub-VIs, etc.

LabVIEW – DAQ, Sub-VIs, etc. Seth Price Department of Chemical Engineering New Mexico Tech Rev. 1/8/14. Data Acquisition. Basic DAQ Loop Read data Display data Write to file Repeat until conditional. Data Acquisition. Advanced features Controlled timing “Record” and “Playback”

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LabVIEW – DAQ, Sub-VIs, etc.

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  1. LabVIEW – DAQ, Sub-VIs, etc. Seth Price Department of Chemical Engineering New Mexico Tech Rev. 1/8/14

  2. Data Acquisition • Basic DAQ Loop • Read data • Display data • Write to file • Repeat until conditional

  3. Data Acquisition • Advanced features • Controlled timing • “Record” and “Playback” • Remote viewing • Data collected, polled by terminal elsewhere

  4. Control Loop • Basic Control: • Read data • If conditional is met, adjust parameter • Display data • Write data to file • Repeat until another conditional is met

  5. Additional Control Considerations • Timing and time constants, sampling rates • Emergency stop criteria • Remote operation • Network security

  6. LabVIEW – Sub-VI • Small program inside of another program • Useful for calculations that are used frequently • Similar to functions, subroutines, etc in other languages • Form of documentation • Cleans up block diagram • Custom icon for ease of understanding

  7. Conversion VI • Write a vi (sub-VI) that will convert V to KV • Sub-VI must have a custom icon and correct connector pane

  8. Conversion VI

  9. Editing Icons for Sub-VI

  10. Shift Register • Allows you to see data from previous loop iterations • Value stored on left shift register appears on right shift register during the next loop iteration http://uncyclopedia.wikia.com/wiki/File:Pacman.gif

  11. Running Sum VI • Write a VI that counts how long a switch is turned on • Needs to be able to count for more than one switch flip • VI runs until a stop button is pressed

  12. Running Sum VI

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