How to use shift register in this structure?

Dear All,
In order to use less variety of graph, I want to use shift register to manage and send data to graph.
But there is not only event structure in my vi, for some reason(because I want to use only one button to control running and stop, and this must do through variety of button, I can't put this loop into the event structure) I must use other while loops, I don't know how to use shift register in this structure.
Please tell me anything helpful.
Thank you!
Attachments:
shift register.vi ‏26 KB

hi there
there are a lot of solutions. my favorite one is the usage of a so called "FGV" (functional global variable). this allows you to strore, manipulate and transport data through your app with a minimum of wires. see attachment.. (other users may have other favorite solutions...)
Best regards
chris
CL(A)Dly bending G-Force with LabVIEW
famous last words: "oh my god, it is full of stars!"
Attachments:
Shift Register 7.1.zip ‏20 KB

Similar Messages

How to use Shift Register?

Hi
Today I spend hours to ficure out how to use a shift register with labview.
I am going to calculate the acceleration of the wheels of an RC-car.
I want to use the simple function to calculate the acceleration.
a=(v1 -v0)/time
From this it follows that I need two speed (ms) values. I was thinking about including a shiftregister that I made before (attached) into the SpeedAngle.vi
But that doesn't work.
Is there maybe an other way to store two following values of the calculated speed? So that I can use it for further calculations.
Thank you!
Attached the two program files.
Bye
Attachments:
ShiftRegister1.vi ‏23 KB
SpeedAngleAdvancedEDIT.vi ‏187 KB

Hi
Thank you very much. Now it works. Attached you will find the program. Now I need to adjust the car with the program. Hope this also works.
One more question. Why isn't it possible to use a Numeric Control twice?
Because I wanted to use the Numeric Control that I use for the time constant (time) also for the calculation of the acceleration.
That doesn't work. Than I placed a Numeric Indicator to display the value of the time constant. But it just displayed the default value.
Bye
Attachments:
SpeedAngleAdvancedEDIT.vi ‏214 KB

How to program shift register to read only when a new user is detected from user?

Hi,
I'm currently developing a program for position control in labview. The program is quite simple, whereby user will input the distance that he wants the table to be in the labview program, and labview will send signal to move a motor that will turn a ball screw to move a table horizontally to the targetted position. The criteria is that the profile of the motor depends on the distance it needs to move, whether a two-phase (acceleration and deceleration) or three-phase (acceleration, constant velocity, deceleration) to reach the target position.
The problem occurs when the user wants to enter a new position (second input) for the table, as the input by user is position the table needs to be but the input required to determine which profile the motor follows depends on the distance that the table will move to get to the targetted position. Therefore, I would need a function to store the input by user temporarily, and recall it only when a new input from user is detected. By this, I would be able to use the difference of the input (input [n+1] - input[n]) and feed it to determine which profile the motor follows and the input by user can be kept as the position he wants the table to travel to (to compare with encoder).
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Is there any way that I can delay the reading of shift register only when a new input is detected or is there another way for me to achieve what i want?
I've tried searching the discussion forum and ni website but couldn't find similar problems. Thanks for your help in advance.
Solved!
Go to Solution.

Hi,
I've managed to get what I needed by using a shift register + event structure as suggested by Adnan. However, I face another problem after implementing SR+event. I've attached two files, first the original program and second the updated program using SR + event. (it's only the jpg file as I've forgotten to save the labview program, will upload the program by tomorrow.
In the original program, I have an elapsed time that is able to run continuously when I run the program. In the updated program, my elapsed time don't seem to run continuously when I run the program (as shown by elapsed time indicator). I need the elapsed time to run continuously as a input to calculate my motor profile.
I suppose this is caused by the introduction of the event structure, will adding a case structure to wrap the event structure solve the problem or is there another way to get pass this. Appreciate if someone could drop me a pointer or two.
Thanks
Attachments:
Mar 16 - continuous elapsed time.png ‏12 KB
Mar 16 - elapsed time not continuous after introducing shift register + event structure.png ‏17 KB

How to use bind variables in this procedure

Hi Experts,
How to use bind variables in this procedure for static queries.
PROCEDURE DELETE_MER_PROC (M_id IN NUMBER)
IS
BEGIN
V_date DATE;
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976208 wrote:
How to use v_date and m_id as bind variables in this procedure to avoid hard parsing.
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How to use File Adapter with hierarchial Structure?

Hi,
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Hey Kishore,
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hi can anyone expalin me how to use parallel cursor for this code ...
loop at itabkpf.
      read table ibsegpar_fu with key
                 belnr = itabkpf-belnr
                 gjahr = itabkpf-gjahr
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Start insert by Pradeep 20082008
      sort: itabkpf by belnr,
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               wskto pswbt zfbdt augbl augdt sgtxt rebzg rebzj
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               fields of table ibsegpar_fu_1 from bseg
               where bukrs = itabkpf-bukrs and
               belnr = itabkpf-belnr and
               gjahr = itabkpf-gjahr and
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Start insert by Pradeep 20082008
          sort ibsegpar_fu_1 by belnr.
End insert by Pradeep 20082008
          move-corresponding ibsegpar_fu_1 to itabseg.
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          move ibsegpar_fu_1-rebzg to itabseg-belnr.
          move ibsegpar_fu_1-rebzj to itabseg-gjahr.
*********to include code to pick the description for partical payment
          select single * from bseg where
              bukrs = ibsegpar_fu_1-bukrs and
              belnr = ibsegpar_fu_1-belnr and
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              augbl <> ibsegpar_fu_1-belnr and
              rebzg = space and
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          itabseg-wrbtr = itabseg-wrbtr * -1.
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        itabseg-pswbt = itabseg-pswbt * -1.
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     loop at itabseg.
      if itabseg-belnr = itabseg-augbl.
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hi can anyone expalin me how to use parallel cursor for this code ...
loop at itabkpf.
      read table ibsegpar_fu with key
                 belnr = itabkpf-belnr
                 gjahr = itabkpf-gjahr
                 bschl = '25' .
Start insert by Pradeep 20082008
      sort: itabkpf by belnr,
            itabsegpar by belnr.
End insert by Pradeep 20082008
      if sy-subrc = 0. "Deleted by pradeep 20082008
        select bukrs belnr gjahr bschl koart lifnr wrbtr
               wskto pswbt zfbdt augbl augdt sgtxt rebzg rebzj
               into corresponding
               fields of table ibsegpar_fu_1 from bseg
               where bukrs = itabkpf-bukrs and
               belnr = itabkpf-belnr and
               gjahr = itabkpf-gjahr and
               augbl <> itabkpf-belnr and
               rebzg <> space and
               bschl = '25'.
        loop at ibsegpar_fu_1.
Start insert by Pradeep 20082008
          sort ibsegpar_fu_1 by belnr.
End insert by Pradeep 20082008
          move-corresponding ibsegpar_fu_1 to itabseg.
          move ibsegpar_fu_1-belnr to itabseg-augbl.
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          move ibsegpar_fu_1-rebzj to itabseg-gjahr.
*********to include code to pick the description for partical payment
          select single * from bseg where
              bukrs = ibsegpar_fu_1-bukrs and
              belnr = ibsegpar_fu_1-belnr and
              gjahr = ibsegpar_fu_1-gjahr and
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      sort ibsegpar_fu by belnr. " insert by pradeep
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      select bukrs belnr gjahr bschl koart lifnr wrbtr
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Why did I only get a part of wave chart even if I have appended the wave together using shift register?

It seems only read 200 samples and then stop. Shouldn't I get a continuous wave chart after using shift register on a while loop?
Solved!
Go to Solution.
Attachments:
trial 4.vi ‏21 KB

You must remove Start VI out from the loop...
You cannot 'Start' a task which is already running...
You also remove the Start VI completely from your code... If you do not use Start VI, a measurement task starts automatically when the DAQmx Read VI runs.
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Attachments:
trial 4 [with START-VI removed].vi ‏15 KB

Any way to save data in loop without using shift register or feedback loop

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Solved!
Go to Solution.
Attachments:
visual.vi ‏34 KB

tombech wrote:
[...]The reason why I don't want to use the shift register or feedback node is due to speed[...]
Tommy,
shift register are the fastest you can ever get...........
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

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Message was edited by: Viswanath Mente

Hi,
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Chirag Gohil

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null

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Program to interfaces. That way, you can switch out implementations and test for yourself which performance is best in an actual production context. But first, write your program so that it works. Worry about refactoring for performance once your program is written and it works.
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Hi,
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