Research ideas on control system using labview

sir
i want to start my PhD work.for that i need some guidance in selecting title .

Hello,
I suppose it'll be nice if you post the same query to National Instruments' India support email ID. Please drop in a mail to [email protected] with your query and I'm sure you will find a response soon.
Regards,
Vaibhav.

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Cheers,
M.J.

Heya... many thanks for the suggestion(s).
The problem with my case is there's any number of users on the network
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Has anybody used Thermo Oriel's encorder Mike control system in Labview?

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A search on NI's website returned a post of someone who is also using Thermo Oriel products:
http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RNAME=ViewQuestion&HOID=506500000008000000555F0000&ECategory=Motion
You may try contacting them for their input.
If you have any specific questions about NI's integration with third party hardware, please feel free to respond.
Julie S.
Applications Engineer
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Control systems in Labview?

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Brian

I think you can achieve this using LabVIEw itself.
Or try searching the forums for Control System toolkit.
Also, there is a VI in the Analyze -->> Signal Processing -->> Frequency Domain palette.
See to it if it can fit your requirement.
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LabVIEW - Wires that catch bugs!

Methods to construct a production line inspection system using labview

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Hello.
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Products and Services: Machine Vision
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Remote monitorng and control by using Labview 8.0

Hi,
I has tried to do the remote monitoring by using labview 8.0. Which I can monitor the VI's through the web browser via the internet. But my problem is when I type the URL link at the internet explorer the Vi's not appear. It just stated 0.00% downloding of 0 byte. I already wait for half an hour but nothing happen. Hope can get any feed back from you guys.
MF Hussin

Hi,
really it's just the visa resource name you're wanting to setup. Have a look at the following link :
http://digital.ni.com/public.nsf/allkb/80C28CC795611E4A86256AB100209521
other useful information can be found here :
http://digital.ni.com/public.nsf/allkb/0f90eca67a4eb1368625716c006b1f2e
and a bit more of a roadmap here :
http://digital.ni.com/public.nsf/allkb/92d475e7246846e786256ed700556d98
For more specific information, have a look at the results returned from ni.com searching for visa and tcp :
http://search.ni.com/nisearch/nisearchservlet?nistype=default&ddown=0&filter=%2Btaxonomy:top+%2B(met...
Hope that helps
Thanks
Sacha Emery
National Instruments (UK)
// it takes almost no time to rate an answer

How to create a feedback control system in labview with an integration block?

Hallo,
I design a model of a simple mechanic system composed by one damper, one mass and one spring.
I would simulate a free response of this mechanic system, but I don't be able to integrate the mechanic state in Labview.
Seeming that the integration block in LabView produce a wrong answer.
I've attached this model create in Labview 8.2.1.
Thanks in Advance
Michele
Attachments:
Sistema dinamico6.vi ‏462 KB

Michele,
First of all, when you are trying to develop a Dynamic Simulation, I strongly recommend that you use the LabVIEW Control Design and Simulation Module (http://sine.ni.com/nips/cds/view/p/lang/en/nid/203826), or, for LabVIEW 8.2.1, the LabVIEW Simulation Module. They allow you to develop your dynamic simulation natively in LabVIEW, specially in the case that you have feedback loop in your code (which is your case).
Now, looking at your program, I have several recommendations that would help you to better control your simulation. First, avoid using the Dynamic Datatype (Blue wire) in you simulation. For example, you are generating a Waveform inside the loop and you are just getting one element of the first batch. Probably, you want to generate only one element per iteration of the while loop and apply that to your equation. If that is the case, you should remove the "Simulation Signal" express VI and use the Point-by-point VI (located at Signal Processing Pallette). There you can also find an integration VI that allow you to define the sampling time for your application.
Also, the feedback node that you are using will introduce one sampling time to your simulation, which mean that, if your simulation and equations are not correctly setup to take that into account, your simulation will be incorrect. If you were using the Simulation Module, it would take care for your to do the correct integration, additional to allow using different solvers (like RK 4-5) to reduce the error on the integration.
Hope this helps. Let me know if you have more questions.
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Temperature control system using thermocouples and cooling fans

Greetings labview community,
I'm fairly new to the labview program and though I have watched the tutorial videos and tried to search these forums I couldn't find a solution to my problem.
I need to write a program in labview that controls the temperature via use of fans inside a case with heatsinks and various electronic parts.
In particular I want to use two thermocouples, in order to measure the temperature of two transistors (one in each side of the case), where heatsinks are placed on top of them.
When the temperature is above 25 degrees, a fan should activate. The fans speed should be faster, the longer the temperature stays above 25 degrees, until it drops down to 25 degrees.
How can this be done? I thought of using a "mask and limit testing" for activating it, but I can't figure out how to control the speed of the fan in a loop automatically based on the temperature.
Here are some of my specifications:
USB-6009 (this was provided to me and is therefore my only option)
Labview 2011
NIDAQmx 9.5 driver
2 thermocouples (one for measuring the temperature for each transistor and activating one fan)
2 fans 0-5V
Below you'll see an attachment of the program I've wrote so far (just for one set of thermocouple-fan) and I'm using a slider to simulate the input from the thermocouple. If there is anymore information needed, tell me.
Thank you very much.
Attachments:
Temperature sensors and fan activation.vi ‏130 KB

Hi Lomedil
What you have is a general control problem. This statement:
"The fans speed should be faster, the longer the temperature stays above 25 degrees, until it drops down to 25 degrees. "
Is an indication that you at least need a PI-controller, or you could use a PID-controller. The I in PID stands for integral and that means that the longer you have the same value different from your reference the larger the control signal will be and thereby the faster the fan will spin.
I would recommend you to have a look at the following article to learn the basic principles of control theory:
PID Control
http://zone.ni.com/devzone/cda/tut/p/id/6440
To find the coefficients in your design you can either choose to make a mathematical approximation of your test setup and then calculate the three constants Kd, Ki, Kp using this model, or you can choose to estimate the parameters on a "trial-and-error" basis until you have the desired response time / overshoot i.e.
In general you should note that designing a control application on a General Purpose O/S as Windows will not give you deterministic timing, thus your control loop can be more unstable than expected, design your controller with this in mind! For the fan operation it should not be a problem but for more advanced control purposes your would always use a Real-Time system like the singleboardRIO, compactRIO or setting up a standard PC as a LabVIEW Real-Time Target (Converting a Desktop PC to a LabVIEW Real-Time Target - http://zone.ni.com/devzone/cda/tut/p/id/2733)
Best Regards
Anders Rohde
Applications Engineer
National Instruments Denmark

I need to log into a remote Linux system using LabVIEW.

I can get in using the FTP protocal to get my data, but I need to execuite a shell command to start data processing. I have tryed Telnet but it wants to be interactive and I jest cant seem to mane it work Has anyone done this. (please note that this process will be done about 300 times during the process and I would like to automate it.
Thank you
James Zumstein
[email protected]

Hi James,
Some ideas:
1. Internet Toolkit from NI - as far as I remember, Telnet is included
2. Using TCP functions (and some documentation about Telnet protocol) you can implement it.
3. Use a Telnet application and try to send "commands" to it (there are available some VIs to communicate with other apps this way, especially for windows)
4. Try to implement a little server application (on your remote machine, capable of triggering those processes) and connect to it using TCP. You can find an example in Labview.
If one of these sounds interesting, I'll be happy to give you details.

May i know how to control PLC using LabVIEW? My PLC is Omron CJ1M-CPU11-ETN21.

Hi,
I am novice in LabVIEW, and i need help in the configuration between LabVIEW and the PLC. My PLC is Omron CJ1M-CPU11-ETN21. I have DSC Module and i have OPC Server as well. I did create tags or even used shared variables to try to write to the output of the PLC, but it does not works. The configuration for the PLC ethernet had done, and i can control the PLC using CX-programmer through Ethernet module. May i know what are the problems?
Regards,
prchin
Solved!
Go to Solution.

Check out this webcast I hope it will be helpful.http://zone.ni.com/wv/app/doc/p/id/wv-263
Regards,
Naqqash.
Naqqash

Controls System Engineer-Labview and Teststand

One year experience in Labview and Teststand/automated testing system for Locomotives.Masters in Embedded Software. Seeking Employment Fulltime/Contract.

Hi,
Thank you for responding. I am based at USA. Currently looking for opportunities here.
Thanks!
Priya

"Fast" control system

I would like to implement a control system using LABView and a DAQPad-6070E. Would it be feasible to try this, or is a real-time controller absolutely necessary?
I assume it should be possible to read a single value from a channel and write a calculated value to an output and repeat this loop at the highest possible rate depending on the computer. So far I have not seen rates above 1000Hz. Is it possible to give an indication of what rates could be obtained with the non-realtime SW and HW versions.
I was also thinking that using an external trigger source might help to get a constant sample period.
Thanks for any advice
Message Edited by GJLR on 12-04-2007 08:21 AM

What kinds of thingies do you want to close your control loop around? Do they really have the bandwidth to benefit from a > 1kHz control loop? Are there hazards if Windows messes up your loop timing and they go unstable? The more it's crucial to maintain continuous control and the higher the control loop rate, the less you can hope for a Windows-based solution.
However, as Ben mentioned, with careful coding you can get Windows to run at 1 or 2 kHz. I'd expect you could meet that timing for >95% of the loop cycles. But some of the misses could easily miss 10's of control loop cycles.
-Kevin P.

Create a NI based PID control system? Advice?

I need to make a new PID control system using labview. I have a magnetically levitated shaft, spinning at 80,000 RPM and is subject to axial loads.
It is a pretty simple. One axial input, one output to an amplifier.
I need it to be fast, dynamic and stable.
Does labview have these capabilities? I suppose I would need to scan the one input channel continiously, and be continuously writing a PID derived control signal which would need to be smooth, obviously not notchy.
What hardware has the capabilities to read and write continuously and have the speed i require. I suppose 20khz input would be fast enough.
I have a current sytem that died on me (motherboard failure) but the computer which is a 486!, the card, the software are all SUPER old, and no one knows how to use it anymore. The DSP card company has been purchased several times and is totally unsupported.
So:
What hardware do you recommend?
What software? LV + PID toolkit?
Anything else?

FPGA is a reconfigurable logic, I can describe it as a kind of "programmable hardware", in the sense that the actual chip is defined in a high level description language, which define connections between logical block of the FPGA. Of course, you can find better definitions on wikipedia, i guess....
Anyway, you don't need to care about how does it works: it matters that these devices are used in real-time, reliable acquisition.
Real-Time is expensive, but consider that you can get discounts buying NI Developer suite, possibly buy one that includes Real-Time and PID module, check your country's sales representative. In my company, we bought NI Developer suite "Control Edition", but it was about 2 years ago, nowadays, I don't know what similar product is offered by NI...
Yes, since cRIO is meant for reliable DAQ, it can do continuous sampling 24/24, 7/7. Only take care to write a reliable software in labVIEW!
Hope it helps.... have a nice day!
graziano

Really need help (motor control using labview)

hi all readers,
im new beginner. really need help for my project. i've been assigned to monitor/control motor using labview 8.5 (using NI DAQmx). the problem is, the techinician told me that i cant use 3phase motor with this card. things that i need to displayed using labview is :
torque
power
current
voltage
speed
really appreciated if readers can help me with this:
wut type of motor shud i use that compatible with NI DAQmx
thanks a lot.

Hi fauziana,
NI data acquisition devices are primarily designed to take measurements, so it's a good idea to measure the signals that you have mentioned with a DAQ device.
You also can use DAQ devices for control tasks, but for reliable and deterministic control behavioryou typically need to use a real-time operating system (not Windows!). If you want to learn more about the pros and cons of using DAQ devices for motion control tasks, please refer to these threads. Still for standard motion control tasks it's much more efficient in terms of development time, to use a dedicated motion control device for the motion control part of your application.
In general the control part is independant from the motor type, as these devices only generate control signals (+/- 10 V). There are many power drives available, that accept this type of control signal and you should select your motor according to the requirements of your application.
For a more detailed system consulting, please contact your local NI branch. To select the products that fit best to your application requirements a face to face discussion is much more efficient than a discussion forum thread, because there are a lot of parameters that need to be taken into consideration. If you tell me in which country you are living, I can provide appropriate contact data to you.
Thanks and kind regards,
Jochen Klier
National Instruments

I am working with a pneumatic actuator and I want to control the supply of compressed air according to the load required using labview

Hello,
I am working with a pneumatic actuator and this is coupled to a generator. According to the load requirement I want to control the supply of compressed air into the pneumatic actuator.
can someone give somehints to write a control program using labview.

haneeshcb wrote:
Hello,
I am working with a pneumatic actuator and this is coupled to a generator. According to the load requirement I want to control the supply of compressed air into the pneumatic actuator.
can someone give somehints to write a control program using labview.
Well....
What are the inputs and outputs you want to acquisition(voltage, current, TTL signals, load sensing...) and control(analog voltages, TTL signals, drivers,ssr,relays, power fets...)
Aquiring a Daq is a start or Arduino Uno to read and control your hardware interfaces to your device
what are the specification requirements and operations...
Have you done a forum search on key words? "pneumatic"....
Being general, opens discussion to nebulous assumptions which members don't have the luxury of time to spend..Though they are willing to help, you must put forth more effort in describing your project, requirements, sensing and controlling, but above all..."what is the problem that you are experiencing?"

Research ideas on control system using labview

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