Course contents
1. Labview basics– virtual instruments, data flow, palettes
2. Structures– for, while, case, ...– editing techniques
3. Controls&Indicators– arrays, clusters, charts, graphs
4. Additional lecture– State machines, SubVIs, MainCluster
5. Modular programming + recording– SubVIs– File I/O– Analysis– Signal processing– Communication between loops
6. Instrument control– DAQ , Data collection, GPIB, Serial
7. Additional lecture– Data Acquisition, Instrument control
Measurement & Automation Explorer (MAX)
• View and control your devices and software
Create simulated device
• You can test your code without the hardware
Create simulated device
• Real devices are green
• Simulated devices are yellow– simulated devices
work just like real devices
Test panel
MAX
• Check pinouts
MAX
• Self Test
DAQ Assistant
DAQ Assistant
• Create new task– put express VI to
block diagram
DAQ Assistant
DAQ Assistant
• Define Task– 1 sample
Acquire 1 sample with DAQ assistant
Acquire multiple samples from multiple channels
Acquire multiple samples from multiple channels
• N Samples
Acquire multiple samples from multiple channels
• You can sample within a loop
Acquire continuosly
Acquire continuosly
Create NI-DAQmx tasks from MAX
Define Task
Define Task
• Tasks are visible in all LabVIEW applications
Task settings
• Input range• Timing• Terminal configuration• Add channels
Run task
• Simulated device will produce sine wave
• Press Save to save the task settings
Test simulated device on LabVIEW• Hardware Input and Output»DAQmx»Analog
Measurements»Voltage»Cont Acq&Graph Voltage-Int Clk.VI
Test simulated device on LabVIEW
Create task from express VI
Generate code from express VI
• Express VI set to Continuos mode
Generate code from Task name constant
Generate code from Task name constant
Output voltages
Output Voltages
• N samples• Generate >> Example
Digital input
• 1 Sample
Digital input
• 1 Sample• Generate >> Example
Digital output
• 1 Sample
Triggered acquisition
Counter
NI DAQmx Help
• Start»Programs»National Instruments»NI-DAQ
Terms
• Physical channel - A terminal or pin at which you can measure or generate an analog or digital signal.
• Virtual channel - A collection of settings that can include a name, a physical channel, input terminal connections, the type of measurement or generation, and scaling information. In NI-DAQmx, virtual channels are integral to every measurement. You can configure virtual channels with the DAQ Assistant, which you can open from Measurement & Automation Explorer (MAX) or your application software. You also can configure virtual channels with the NI-DAQmx API in your application program.
• Task - A collection of one or more virtual channels with timing, triggering, and other properties. Conceptually, a task represents a measurement or generation you want to perform. You can set up and save all of the configuration information in a task and use the task in an application. In NI-DAQmx, you can configure virtual channels as part of a task or separate from a task.
• Local channels - Virtual channels created inside a task. • Global channels - Virtual channels defined outside a task. You can create global channels in
MAX or in your application software. You can use global channels in any application or add them to a number of different tasks. If you modify a global channel, the change affects all tasks in which you reference that global channel. In most cases, it is simpler to use local channels.
Links
• DAQmx Simulated Devices– http://zone.ni.com/devzone/cda/tut/p/id/3698
• DAQ Assistant and automatic code generation– http://zone.ni.com/devzone/cda/tut/p/id/4656
• Useful DAQmx functions– http://zone.ni.com/devzone/cda/tut/p/id/2835
• Continuous vs. Finite Sampling– http://
digital.ni.com/public.nsf/allkb/B86AA2D2FDE9A16086256FFC00604202• Read multiple channels sequentially (advanced)
– https://decibel.ni.com/content/docs/DOC-6901