LabVIEW
Ho can I change a contraol variable value automaticly in an exact time
Hi Shhashemi,
@Shhashemi wrote:
change the vale of a global variable automatically in exact times.
For example, I have a global variable that tells my DAC to set the resolution at a value (let say 3) and then after 3 min I need this value to change to 5
Why do you need a global variable for that purpose?
How does your "DAC" recognize you have changed the global's value exactly after 3min?
Wouldn't it make more sense to send a command to your "DAC" at the required time to change a setting without using an additional global variable?
@Shhashemi wrote:
Timing and being able to set the order of value is very important in my current VI.
Use a FOR loop to index over an input array holding the time delays and setpoint values. Inside the loop you just need a wait function and a "set value" operation…
Hint: From your question it seems you should investigate in/learn about using state machines…
You mean change something after a certain time interval not exact time...
Anyway in the timing pallet there are several items that can be used to wait for a certain amount of time.
Changing a global variable does not really do much. What matters more is what parts of your code depend on its value and when that part of the code decides to read that global variable.
To do a sequence of states, you don't need any global variable at all.
What kind of timing accuracy do you need (seconds? nanoseconds?).
Are all steps known before the experiment starts or do you want to be able to adjust timings and voltages on the fly?
How do you interact with your DAC hardware? What is your code architecture? (state machine? spaghetti? baby LabVIEW (i. e. all express VIs and dynamic data)?)
@Shhashemi wrote:
I am very new to LabVIEW.
Have a look at the learning resources listed on the top of this forum.
