Run two VI's simulateously?

Hi,
I was wondering is anyone has atip how I run two VI's simultaneously. The first VI is collecting data (through an instrument from HP) and I would like the second Vi to dislay the data while it is collected. I have seen some old VI's in a different program that use "Occurences", is that a solution? Or is there ab easier way?
Thanks!

Just adding a tidbit or two to devchandler's reply...
Another key distinction is that a queue is best for lossless buffered transfer of data to exactly 1 reader from 1 or more writers. A notifier is best for lossy unbuffered transfer of data to 1 or more readers from 1 or more writers.
Notifiers let multiple independent parts of the code react quickly to read data immediately after it gets updated by some other part of the code. If there are 2 writes between any reads, the data from the older write is displaced and unrecoverable.
I've begun making a habit of basing my "global abort" status flags on Notifiers. Anyone can write an abort condition and everyone can read it.
-Kevin P.

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This should help:
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Go to Solution.

I'm guessing this is a bug that NI needs to fix. I see no reason you shouldn't be able to install the run-time engine of an older version. I'd be interesed in if it allows you to install the older development environment, which also includes the older run-time engine. There are some command line switches for NI installers as mentioned here:
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Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

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trsv,
Welcome to Apple Discussions.
Create two Groups...
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;~)

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Can I run two PIDs from the same vi?

Hi
I want to control speed of the rotating shaft and force applied by the pneumatic cylinder using two different PIDs from the same program.
I managed to get two PIDs to work separatly using PID control loop VI`s supplied with labview 6.1 (I got Kc, I and D right, so there is no overshoot). When I try to run both PIDs within my vi they don`t work. I again tried various gains and managed to get one PID to work but not the other. Then through trial and error I managed to get a second PID to work but I had to change refresh time of the FOR loop from 100msec to 1msec.
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ning PID has effect on the PID?
I would really appreciate any comments/help. I am pretty thrustrated at this time
Thanks"

The timing of the FOR loop will influence your PID control, which is a fundamental part of PID control. Acquiring data doesn't affect the PID although it could affect the timing of the loops. For instance if you only have one DAQ card you would want to have it all in one loop because you can not have two AI sessions open to the same card.
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JR A.
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Can i run two PIDs at the same time?

Hi
I want to control speed of the rotating shaft and force applied by the pneumatic cylinder using two different PIDs from the same program.
I managed to get two PIDs to work separatly using PID control loop VI`s supplied with labview 6.1 (I got Kc, I and D right, so there is no overshoot). When I try to run both PIDs within my vi they don`t work. I again tried various gains and managed to get one PID to work but not the other. Then through trial and error I managed to get a second PID to work but I had to change refresh time of the FOR loop from 100msec to 1msec.
Does anyone have experience with running two PIDs in the same program? Does the timing of the FOR loop influence PID contorller? Does equiring of other data while
running PID has effect on the PID?
I would really appreciate any comments/help. I am pretty thrustrated at this time
Thanks

I don't know whcih PID vi's you are using but I had similar problems. I
solved it by going to the VI properties of the PID subvi, select category
execution and make sure that reentrant execution is selected. Only then two
instances of the PID vi can run without interfering each other.
Martien
solved by setting the execution mode
"smartlander" wrote in message
news:[email protected]..
> Hi
>
> I want to control speed of the rotating shaft and force applied by the
> pneumatic cylinder using two different PIDs from the same program.
> I managed to get two PIDs to work separatly using PID control loop
> VI`s supplied with labview 6.1 (I got Kc, I and D right, so there is
> no overshoot). When I try to run
both PIDs within my vi they don`t
> work. I again tried various gains and managed to get one PID to work
> but not the other. Then through trial and error I managed to get a
> second PID to work but I had to change refresh time of the FOR loop
> from 100msec to 1msec.
> Does anyone have experience with running two PIDs in the same program?
> Does the timing of the FOR loop influence PID contorller? Does
> equiring of other data while running PID has effect on the PID?
> I would really appreciate any comments/help. I am pretty thrustrated
> at this time
> Thanks

Can I run two big external monitors on my 2012 MacBook Pro?

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I know that the retina MBP has two Thunderbolt ports, plus a DVI port, which would have easily given me what I need. However, I didn't get the retina MBP because it's totally non-upgradable by a user. There were a couple of other potential additional issues, including some reported problems installing Windows into Parallels via external DVD player. There's also the $mid-3000's price for retina, tricked out the way I'd like... Tradeoffs! At least I still have Firewire.
The two big externals help a lot with video editing. Even with my old G5 PowerMac, you could immediately drive two 1080p-equivalent displays. I expect that someone will release a much-more powerful solution than the Matrox USB 2 screen driver dongle, etc., sometime soon, using "superfast" USB 3, but I'll lose one of my two USB 3 ports; I'll want to have 'em both free for other externals, I'm sure.
Thoughts and/or solutions?

For those following this thread...
There is a posting elsewhere here in Discussions that describes how to get two large external monitors running on a recent Macbook Pro by using only ONE Apple Thunderbolt Display, then daisychaining a LaCie Thunderbolt drive after the T-Bolt display, and this allows adding another large DVI display in the chain after the LaCie.
Still pricey, since it does involve buying one Apple Thunderbolt Display, plus a LaCie drive, and cables, plus the DVI display, but it's around half a thousand dollars cheaper than two Apple T-Bolt displays, plus you have a very fast LaCie external drive.
Still not what I'm looking for, but if you're interested, here's a link...
https://discussions.apple.com/message/18391941#18391941

Is it possible to run two different versions of Apple operating system (for ex. 10.6.8 and 10.9) on a MacBook Pro, either on the same disk or from an external hard disk? If so, where would I find the details?

Is it possible to run two different versions of Apple operating system (for ex. 10.6.8 and 10.9) on a MacBook Pro, either on the same disk or from an external hard disk? If so, where would I find the details? (In order to be able to use the older applications no longer supported in 10.9)

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Can I run two external displays off a MacBook?

Hi there.
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You can have two independent external displays on the workstation macs such as G4, G5 and Mac Pros but not on apple laptops to the best of my knowledge. If you look on that page it shows the Mac Pro then underneath it is the image of two montiors side by side with the shark image going across it. Lower down is a Macbook Pro with one additional monitor next to it.
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How can we launch the labview screen beyond other screens while running two applications on a same time

Hi all,
I need to run two applications in my system at same time. one of the application is labview. it is running in backside. the dialog boxes which i created in labveiew need to display in fron of all applications.... what should i do to do that.....any suggestions...
thanks in advance
Regards,
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The easiest thing to do (but can be bad) is to make the LabVIEW window modal. This will make it the front most window at all times, until the program stops executing. As you can imagine if you don't have a way to close the window then you will be forced to kill LabVIEW through the taskmanager.
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Message Edited by Hooovahh on 07-02-2009 08:44 AM
Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

Run two VI's simulateously?

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