Share cluster data between 2 timed loops

What is the best and safest way of sharing cluster data between 2 timed loops running. I could use locals, but that is risky, would shared variables work better? All I need to do is modify a couple of datatypes in a cluster that both threads use.
Thanks...

You could go the LVOOP route and create a singleton object. The object can be passed to parallel tasks an dsince it is singleton they will all share the same value. Ue of a DVR inside the object would allow you to have a single copy of the data. Your class would also give you the necessary accessors for reading/writing data.
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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For a start, just "session" instead of "request.session" would work better. But why did you post this here and not in the JSP forum? Doesn't seem to have anything to do with Java programming.

How to share the data between two or more frames

How to share the data between two or more frames based on the database relationship in JDeveloper?

You can pass data between frames by passing it as parameters.
That is when you are invoking another frame, pass your data as arguments through the constructor to that frame .
You can also achieve this through static or public methods, but static variables as we know is not suggested which might occupy more memory space.
Regards,
Srinivasan AShwath
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by [email protected]:
How to share the data between two or more frames based on the database relationship in JDeveloper? <HR></BLOCKQUOTE>
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Past data between timed parallel loops

Hello
I am working with a piezo-motor system and a test machine.
-I send a comand every 20 ms to a motor to generate a movement on a strenght test machine.
I have a timed while loop where I send the comands to the motor. The data I send is a SGL format number.
-I read the force (with an other device) generated by the motor movement.
(The device generate internally measures every 20 ms and save it on the device memory. The measures include force data and time stamp).
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What I need is to get a measure with the last sended motor position and the force value at that time (synchron) every 20 ms (as accurate as possible). I know its not possible because I am not working with a real time system. What I would like to know is the best way to do it as accurate as possible.
I am using local variables to get the data from the motor and the force device. I have a third parallel while loop where I read both local variables every 20 ms. The quesions are:
-Since I cant not use queues or notifiers to pass data between loops because the loops sould be timed loops, witch is the best way to past the data between loops (local variable)?
-Should I use one of my device loops (motor loop, or force device loop) as a master and get the value there of the other device?
I cant post my code because the motor and the force device have small subVIs with license. Sorry.
Thanks

Navarro_ wrote:
Hello
I am working with a piezo-motor system and a test machine.
-I send a comand every 20 ms to a motor to generate a movement on a strenght test machine.
I have a timed while loop where I send the comands to the motor. The data I send is a SGL format number.
-I read the force (with an other device) generated by the motor movement.
(The device generate internally measures every 20 ms and save it on the device memory. The measures include force data and time stamp).
I have a second parallel timed loop where I send a command every 20 ms to read the last data on the device memory
What I need is to get a measure with the last sended motor position and the force value at that time (synchron) every 20 ms (as accurate as possible). I know its not possible because I am not working with a real time system. What I would like to know is the best way to do it as accurate as possible.
I am using local variables to get the data from the motor and the force device. I have a third parallel while loop where I read both local variables every 20 ms. The quesions are:
-Since I cant not use queues or notifiers to pass data between loops because the loops sould be timed loops, witch is the best way to past the data between loops (local variable)?
-Should I use one of my device loops (motor loop, or force device loop) as a master and get the value there of the other device?
I cant post my code because the motor and the force device have small subVIs with license. Sorry.
Thanks
I'm not sure you need something so accurately timed? The motor movement isn't going to be instantaneous, so when were you planning on starting the event? When will the resulting measurement be valid? I suppose there will be ringing?
Or maybe the motor movement needs to be continuous and you take measurements at very accurate time intervals.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

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Want to share application data between Mac's on home network.

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http://support.apple.com/kb/HT1229
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Hi k,
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How to make the exchange of data between 2 while loop in real time

hello
I have 2 while loop
the 1st while loop includes the data acquisition program
the 2nd while loop includes the control program
my question is how to make the exchange of data between 2 while loop in real time
I tried with the local variable and direct wiring between the 2 while loop
it does not work (there is a delay)
Solved!
Go to Solution.

Bilalus,
Queues are only good to transfer data if your application isn't deterministic. Since you are using Real Time, I am assuming that your application requires determinism. If you are using Timed Loops and you use queues to transfer data between your loops, you are losing determinism. In this case, you need to use the RT FIFO functions.
Warm Regards,
William Fernandez
Applications Engineering
National Instruments

Using events (?) to share data between tab pages

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I'm pretty new to Java, so be patient!
I wish to have a JTabbedPane with a tab to do 'Import' of data, and a tab to do 'Export' of data (the SAME data which was imported). Now, how do I share the data between the 2 tabs?
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Help!!!
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I think this is an OO design question.
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Sharing static data between all WD components

Hello
I'm looking for a way to share static data between all WD sessions of a WD application. Static data is static (language depended) value lists for instance. How can this be done in WD for ABAP?
Is this recommended at all?
Regards, Mathias

Hi,
if these lists are static, you can use z-tables with in the key a 'spras' field.
do the selection while loading the application with sy-langu on those tables to fetch the language dependant lists
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you should use the same assistance class in all of them and fetch the data in the main component to store it in the assistance class.
this class will be instantiated and all the other components will have access to the data (instance will be recognized automatically as of SP11)
grtz,
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Edited by: Koen Labie on Mar 6, 2008 5:06 PM

Synching calendar dates between 2 handhelds

Computer idiot here. Sorry if this is a dumb question. My wife and I each have a Zire 72. We want to get the calendars on each of them to show the same appointments etc. We've tried synching them thru the desktop (we have separate user names on the desktop) but that doesn't seem to work. Have also tried to beam but the handheld says calendar data can't be beamed. EIther way, we can't seem to make it happen, but I have to think that there must be a way to do this! Can anyone tell me how it can be done? Thanx!
Post relates to: Zire 72

You should be able to beam the data, sounds like you are trying to beam the calendar database file thats why its saying it can't do this, instead go into the calendar application then select menu and select send event.
There is also a program called SyncUs this will allow you to share pim data between devices with each device having its own username.
Post relates to: Centro (Sprint)

While loop and data acquisition timing worries

Hello everyone,
I apologize in advance if this is a silly question, but I could not find the answer around here.
I have made a VI to record continuously from 64 analog channels at a 5kHz sampling rate. I then stream this data to a tdms file. The data acquisition and write functions are in a while loop.
I the same loop, I have a bunch of other loops, that each run on their own wait timers to help limit the amount of memory they take up. I am now worried that this may somehow affect my data acquisition timing.
If I put a bunch of timed loops within another loop, does the outer loop run at the same pace as the slowest of the inner loops? And could that mess up my sampling rate?
I have attached my VI, in case what I just wrote makes no sense at all.
Thanks for any tips...
Attachments:
Record_M8viaDAQv3.vi ‏237 KB

Well, looking at your code you will only write to your TDMS file one time. You have multiple infinite loops within the main/outer loop. That means that the main loop will only run a single iteration because it cannot complete an iteration until all code within it completes. With at least two infinite loops inside the loop it will never complete. Not too mention the only way to stop your code is to hit the stop/abort button. NOt a very good way to stop your code. As someone once said using the abort to stop your code is like using a tree to stop your car. It will work but not advised.
As Ben mentioned try to understand data flow better. You have unnecessary sequence frames in your code where normal data flow will control the execution sequence.
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

Share cluster data between 2 timed loops

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