Problems implementing the elapsed time express vi into my vi
I am trying to implement the Elapsed Time Express VI into my VI so that my VI runs for a specified amount of time. I currently have the express VI working, but now that I have implemented it into my VI, my graphing functions do not work. If anyone has any suggestions, I would greatly appreciate your help. I have attached my VI for reference.
-Kelly
Attachments:
Inj&Sam_C348_C_wrt_File_and_Timed.vi 405 KB
The way you have your VI configured, the outer while loop will only run once. It will run, but will not be able to continue until the inner loop has completed. The inner loop will continue to acquire data until the desired time has passed. A this time a true will be written to the stop terminal on the inner loop, and then passed to the stop terminal on the outer while loop, stopping it when it has only run through one iteration. I'm not sure what you are trying to do, but my guess is that you want your second while loop to be outside of the first one. You can then stop them both by using a local variable or some synchronization mechanism.
Regards,
Ryan K.
Similar Messages
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How can I get the Elapsed Time express to output in milliseconds?
I am trying to get the Elapsed Time express to output in milliseconds or in seconds to three decimal places. I am pretty new at this.
Thanks in advance!I'm not sure I understand your question. The output of the Elapsed Time Express VI is a DBL. It's already a floating point number. The default format for a numeric indicator is 6 digits of precision. You can change this in the properties for the indicator.
To learn more about LabVIEW it is recommended that you go through the tutorial(s) and look over the material in the NI Developer Zone's Learning Center which provides links to other materials and other tutorials. You can also take the online courses for free.
Attachments:
Example_VI.png 4 KB -
Usage of "Elapsed Time" Express VI
I'm trying to program in Labview something like "Action 1" -> Wait 5 seconds -> "Action 2" -> Wait 5 seconds -> "Action 3". The "wait 5 seconds" should not block everything else but other tasks / VIs should continue running. Does anybody have a good solution for this? I tried to use the Elapsed Time Express VI but it does funny things. Can anybody explain to me how to properly use the Elapsed Time Express VI and especially how the reset input works?
As Lynn said, I think all you need is a simple Wait(ms) call, but to answer your specific questions...
The Elapsed Time Express VI tells you if the time you specified for Elapsed Time has expired; it does not actually wait for the time to expire. An example of how you would use this is to include a call to the function in a loop. When the "Time has Elapsed" boolean is true, you perform some action. If not true, you do nothing. This would allow you to use a fast running loop that only did some elapsed time action every so often instead of every time through the loop.
The Reset you asked about is a way to reset the internal state of the VI. The VI keeps state information, which makes sense and is normally what you want it to do. However, you may want to have it
reset on this particular execution, e.g. on the first iteration of a loop that is within an outer loop.
Hope this helps,
Roy -
Hi ! am working on a program that calculates the elapsed time (for the needle of the gauge to reach a value which is previousely defined) also the elapsed time while the needle is maintained at the same value, which means there are two time counters, the first one stops when i reach the value and the second one stops when i leave it.
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AR
Solved!
Go to Solution.ABDESLAM wrote:
the program does exactly what u just said !
but i don't understand the number 3 sentence.
well am working on a project on a link flight trainer and i want to calculate the time that the pilot takes to go from 0 to 30 degrees for example on the Attituge gyro indicator then it calculates the time while he's maintaining this value.
dial2 = the handle of the simulator
AGI = attitude gyro indicator ( it indicates the degree of turn of the plane)
i hope u understood what's it all about
thank you
What he's trying to say is he doesn't understand why the time delay is hanging off the end of the while loop like that. Since it won't execute until after the first while loop is complete, what does it do? If you're hoping it will induce a wait in between the two while loops, it might accidentally work that way, but since the second while loop and the time delay are running in aprallel, there's no way to determine which will happen first.
BTW - if you already know what the code does, what, exactly, is your question? How does what it is doing differ from what it should be doing?
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
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>
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Oracle10.2.0.5 on AIX6.1.
Here is the awrsql report of a query for a one hour window.
Here UNBILLED has 120million records which is partitioned and subpartitioned. It has 10 partitions and 312 subpartitions. One subpartition has 10M records, 10 others have 1M each and 270 subpartitions have 360K records each. And 31 subpartitions are empty.
And BILLED has 300K records.
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Stat Name Statement Per Execution % Snap
Elapsed Time (ms) 984,327 5,561.2 28.6
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Parse Calls 0 0.0 0.0
Rows 106,200 600.0 N/A
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Cluster Wait Time (ms) 0 N/A N/A
Application Wait Time (ms) 0 N/A N/A
Concurrency Wait Time (ms) 0 N/A N/A
Invalidations 0 N/A N/A
Version Count 1 N/A N/A
Sharable Mem(KB) 31 N/A N/A
SQL_ID akg45a750sh0u
DELETE UNBILLED WHERE (MSG_ID, MSG_ID2,SPLIT_ROW_NUM) IN (SELECT MSG_ID,MSG_ID2, SPLIT_ROW_NUM FROM BILLED
WHERE BILL_REF_NO = :B2 AND BILL_REF_RESETS = :B1 )
Plan hash value: 3879210699
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Pstart| Pstop |
| 0 | DELETE STATEMENT | | | | 1 (100)| | |
| 1 | DELETE | UNBILLED | | | | | |
| 2 | NESTED LOOPS | | 1 | 112 | 0 (0)| | |
| 3 | TABLE ACCESS BY GLOBAL INDEX ROWID| BILLED | 1 | 65 | 0 (0)| 1 | 1 |
| 4 | INDEX RANGE SCAN | BILLED_XCB_BILL_REF_TRANS | 1 | | 0 (0)| | |
| 5 | INDEX UNIQUE SCAN | UNBILLED_PK | 1 | 47 | 0 (0)| | |
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Thanks for your time...user1014212 wrote:
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