Loop with n cycles

Hello Experts,
I've been working on scriptlogic and loops are different than other programming languages. Is there any way to create a loop with n cycles. (n = input)
Thanks in advance.

Hi,
If suppose you want to run a logic 10 times, this will be little difficult in BPC. The *FOR / *NEXT statement can be used when we already know values for which the code should run. For example, if we want to run the code 3 times,
*FOR %VAR% = 1,2,3
//yourscript
*NEXT
Now, the challenge is how to create the list of {1,2,3}. Similarly, if the code needs to run for 5 times, then the list should be {1,2,3,4,5}. If the list is static, you can always hardcode it in the above fashion. However, if its dynamic, then we need to look at some alternative.
Hope this helps.

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Loop with event structure

I put an "event structure" inside of a while loop. My target is to keep the
VI running and make selections to run different subVI. But I got two
questions:
1. how to use two button on front panel? I mean, when I press one button,
step 1 runs, when I press the other button, step 2 runs. Is event structure
the best way to do that? another side quesition is that how I can make the
button jump back after I pressed it? It kept in the "down" position and I
have to press it again to release it.
2. When I test the VI, I found the while loop can't stop. The boolean input
of false won't stop the VI. I wonder if there is a rule that the event
structure must run at least once? or any other hidden properties I didn't
notice?
thank you very much!
cheng

"Michael Sachs" wrote in message news:...
> You can change the boolean's mechanical action to a latched type and then it
> will pop back up.
> The event structure has a timeout input that defaults to infinite. If the
> event loop is waiting for an event or timeout then your outer while loop
> will not cycle. Use the hightlight execution lightbulb on the diagram to
> see what the data flow is doing.
>
> Mike Sachs
> Intelligent Systems
>
> "Cheng" wrote in message
> news:[email protected]...
> > I put an "event structure" inside of a while loop. My target is to keep
> the
> > VI running and make selections to run different subVI. But I got two
> > questions:
> >
> > 1. how to use two button on front panel? I mean, when I press one button,
> > step 1 runs, when I press the other button, step 2 runs. Is event
> structure
> > the best way to do that? another side quesition is that how I can make the
> > button jump back after I pressed it? It kept in the "down" position and I
> > have to press it again to release it.
> >
> > 2. When I test the VI, I found the while loop can't stop. The boolean
> input
> > of false won't stop the VI. I wonder if there is a rule that the event
> > structure must run at least once? or any other hidden properties I didn't
> > notice?
> >
> > thank you very much!
> >
> > cheng
> >
> >
Hi Cheng,
that's not quite the whole story. The event structure breaks down
into two types. Those that get actioned between the start of the event
(i.e. mouse down) and the result of that event (i.e. the button
registers true) which are filtered events, and the other type (like
mouse up) which occur after the event and the result of the event.
With filtered events you can modify the result of the event as it
happens. Whichever you choose to use, you need to do one of two things
to get the button to pop back up (setting to latch when pressed on
it's own won't work) - you can either read the FPTerm within the event
itself with this set to Latch when pressed, or (my prefered method) is
to use the CtrlRef that's available inside the event, and use the
ActiveX method Reset to Default. This way the FPTerm for the button
can be left somewhere else, and it's more obvious what the program is
doing at this point.
Your while loop is actually a do {} while loop, i.e. it must execute
at least once before it checks to see if it should iterate again.
Mike's suggestion of follow the hi-light execution is the best
solution.
Hope that helps
Sash.

Why writes LabVIEW only every 2 seconds the measured Value to a Excel (In a while loop with 100 ms tact)?

Hi everybody,
I use the myDAQ to measure speed, ampere, and voltage of a battery driven motor. (For Current measurement, i use a Sensor which outputs a 0-10 V signal). I placed all DAQ-Assitants in a while loop with a [Wait until next ms multiple] clock and set a value of 100 ms. I thougt, Labview will now write into my text file 10 times a second all values. In fact, as you can see in the attached text file, Labview only writes in a unsteady interval of 1-2 seconds a value, which is too less.
The question: Did I do anything wrong, how can you create VI that writes you lets say 10 values a second into text file? Or is simply the DigitalMultimeter input of the myDAQ not able to sample a rate of 10 Hz? I couldn´t find any information in the specification handbook about the sample rate of the DMM?
If anyone can help me would be great! Thanx a lot, Markus
Attachments:
Measure Speed+Current+Voltage into Excel.vi ‏175 KB
Test7.txt ‏1 KB

File I/O is not very efficient. I recommend that you do you file logging in a parallel task. Have one task do your data acquision. This task would then pass the data to be logged to the logging task via a queue. That way your file operations do not impact your data acquision. Also, express VIs are not very efficient. You would be better off accessing that directly using the DAQ VIs. The express VIs contain lots of steps that do not need to be done every time you call it such as initializing the device.
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"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
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Working in Logic 9, how do I use a drum loop WITH ITS PRESET EFFECTS? I can drag and drop the loop but it plays dry in timeline. thanks

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Green Apple tracks are MIDI files (so to speak). If you drag one from the loop browser (Capitol C Orchestral hit, as you mentioned in this exable) directly into the arrange page it creates the MIDI file and the instrument to play it back on.
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What I would like to do is have a data acquisition loop that samples a load cell at 500Hz and have another loop that runs much slower to run a state machine and display some data in real time. The reason I want to sample the load cell so fast is to filter out some noise. Making producer/consumer loops with a queue kind of makes sense but I don't really care about all of the samples, I just want to be able to read a real time filtered signal at certain times. I looked at having just two parallel loops, one to acquire the data and the other to run a test and retrieve a real-time signal when I want but not sure how to pass data between the loops without using a queue. You can do it with local variables but you are at risk of a race condition. I hope this make sense. I am sure this is a simple problem I just don't know what direction to go. Thanks

Good Evening secr1973,
It sounds like you are on the right track. You already know about the producer/consumer architecture; this is almost always the first step to the separation that I think you are after.
The step that I think you are missing is a Case Structure around the enqueue element VI. You likely have some event or specific pattern that you are looking for in the input signal. You can have the output from this algorithm (likely a boolean) determine which case of the Case Structure to execute (Case 1: enqueue the element or Case 2: Do not enqueue the element).
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If it is easy/fast, you can likely get away with doing this processing in the producer loop. My guess is that your program falls under the category of do-it-all-in-the-producer loop because you are only acquiring at 500 Hz.
If the application requires faster acquisition rates or if the logic is going to require some processing, you may want to implement a double layer producer/consumer architecture. In this setup, you would pass all of the data from the DAQ producer to a second loop (using queue #1) that determines what to do with the data (to enqueue or not to enqueue...) and, if appropriate, write to a queue (queue #2) that the third loop can read. The third loop would be where your state machine executes.
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Regards,
Charlie Piazza
Staff Product Support Engineer, RF
National Instruments

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<%
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%>

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Code
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Hi sri,
    it is posible clearly.
see this code.
data: t_spfli type table of spfli with header line,
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select * from spfli into table t_spfli.
select * from sflight into table t_sflight.
loop at t_spfli.
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endloop.
endloop.
Plz Reward if useful,
Mahi.
Message was edited by:
        Maheswari Chegu

Adobe Extension Manager loops with the following message: "The Extension Manager will now launch and

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Display a message in a For Loop with field value

Hello All,
pls,i wanna display a message in a For Loop with field value the code is:
FOR Q1 IN GET_SUM_EXP_QUANTITY LOOP               .
INSERT INTO PLN_PLAN_DISTRIBUTION_WAY
(FIN_YEAR_CODE , MONTH_CODE , MATERIAL_CODE , DISTRIBUTION_WAY , EXPECTED_QUANTITY , GROUP_CODE)
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Regards,
Abdetu..

Thanks 4 reply..
again they r in a For Loop as mentioned above...
     INSERT INTO PLN_PLAN_DISTRIBUTION_WAY
                                                       (FIN_YEAR_CODE , MONTH_CODE , MATERIAL_CODE , DISTRIBUTION_WAY , EXPECTED_QUANTITY , GROUP_CODE)
                                        VALUES (:PLN_PLAN.FIN_YEAR_CODE , V_REPAIR_MONTH , Q1.MATERIAL_CODE , 1 , V_REPAIR_Qty , Q1.GROUP_CODE);
FORMS_DDL('COMMIT');
The fields in bold r required to be displayed for testing puposes..
this gives me numeric or value error in runtime..
Best regards,
Abdetu..

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/M

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Message Edited by Mark Yedinak on 10-06-2009 04:29 PM
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

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Thanks,
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Loop with n cycles

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