Circuit for auto tuning of pid controller in lab view

Hi sir
for my project in auto tuning of pid controller using labview,for that
i require a simple circuit diagram(lab view figure) and have no problem in running for that
i will be very thankful to you

Hi!
I am not sure if I completely understand the question but if you are wanting to do autotuning for PID there is actually a VI that will do it for you. It is called PID Autotuning.vi and can be found under the PID Control pallete in LabVIEW. The LabVIEW Help file also contains more detailed information on the inputs and outputs to the VI.
Carlton
CLD

Similar Messages

Using PID Auto tuning VI

I woul like to know a little bit more about the PID Auto Tuning VI. I read (in the user's manual) that it uses the Ziegler-Nichols method. I know that this method increases de Kc (gain) parameter until the system becomes oscillatory and then with that Kc and the period of the oscillations Tu you find the PID gains. I would like to know how the VI increases the Kc, and if it increases de Kc until the system is oscillatory.

Hi Yen78,
Yes, the PID Auto Tuning vi increases the Kc gain parameter till system output becomes oscillatory. Page 2-6 of the manual http://digital.ni.com/manuals.nsf/websearch/A25258DF0D3E3CB386256B41000BA9B9 gives more information on this. You can also open the block diagram of the PID Auto Tuning vi and specifically look at the PID Relay Auto Tune.vi to see how the code is written. This tutorial has a section on Tuning which is also informative http://zone.ni.com/devzone/conceptd.nsf/webmain/d4748f0d59cf436d8625702700809ef4#3
Hope this helps!
Regards,
Prashanth

Laser frequency stabilization using pid controller

Does anyone know of an example where the PID controller in LabVIEW has been used to stabilize the output frequency (wavelength) of a diode laser? A PID module for our laser can be purchased, but I'm hoping to try a LabVIEW-based system. Ideally, we'd like the long-term (minutes) variation of frequency to be a few MHz.

The input to the PID is the process variable which is the output of the lock-in. The lock-in is processing a signal which is related to the frequency of the laser. Is the set point in frequency units or something else?
The output of the PID goes to the current input of the laser controller. The only scaling in the PID is based on the values for Kp, Kd, and Ki.
So it seems likely that some conversion will be appropriate. Do you know enough about your optical process to have a value for the frequency change per volt of output of the lock-in? Do you know the frequency change per amp of laser controller input? You should be able to combine those values to determine an appropriate scaling factor.
You used "accuracy" and "precision" in successive sentences and I wonder if you have them confused. Accuracy refers to how close to the actual value a measured or commanded value is. Precision essentially refers to the number of significant digits in a value.
You have set the precision of the value written to the laser controller to 2 digits after the decimal point. If you want more precision (an if the instrument supports it), you need to change the format string.
Increasing the sensitivity of the lock-in is the same as increasing Kp in the PID. At high enough values most systems oscillate.
My first concern with oscillation would be the time delay. What are the time constant settings on the lock-in? How long does the laser controller take to respond to a command over the GPIB? Time delays in a feedback system make the system very difficult to stabilize.
The system I worked on never worked completely to my satisfaction. It always required a significant amount of manual tuning.
Lynn

OMA 12c - Auto tuning doubts

Hi all.
This morning we've received an alert from OEM 12c saying that one of the agents has gone down. Analyzing the logs we could see that the agent was shutdown automatically and put up few minutes later. In the logs description was detected that an auto tuning had started and when it was finished the agent started again. Does anyone know if this is a normal procedure for the agent auto tuning task? Is there a way to change the time this jobs starts?
2013-07-10 09:33:27,030 [main] INFO - EmdCtl Timezone = America/New_York
2013-07-10 09:33:28,894 [main] INFO - Command: run_autotune agent
2013-07-10 09:33:28,933 [main] INFO - Performing AutoTuning
2013-07-10 09:33:30,888 [main] INFO - Library [/oravl01/oracle/app/oracle/agentHome/core/12.1.0.2.0/jlib/agentLib.jar] is loaded
2013-07-10 09:33:30,889 [main] INFO - Library [/oravl01/oracle/app/oracle/agentHome/core/12.1.0.2.0/jlib/ws_fetchlets.jar] is loaded
2013-07-10 09:33:30,890 [main] INFO - Library [/oravl01/oracle/app/oracle/agentHome/core/12.1.0.2.0/jlib/ws_fetchlets.jar] is loaded
2013-07-10 09:33:30,890 [main] INFO - Library [/oravl01/oracle/app/oracle/agentHome/core/12.1.0.2.0/jlib/gccomplianceLib.jar] is loaded
2013-07-10 09:33:34,655 [main] WARN - adding in static cost for collection
2013-07-10 09:33:35,152 [main] INFO - AutoTuning done
Thanks

Bruno,
It would be good to get the screenshots of the following:
1. The incident/event from Incident Manager that indicates the DB is down. Specifically - please capture snapshots of the "Updates" tab within the details.
2. The ruleset definition - since you say you got at least one email - I'll assume the target list on the ruleset is ok - so please provide screenshots of the specific rule including the selection criteria and the actions.
thanks

Thruster control using PID controller

Dear All,
Actually my project is related to heading control of an underwater system using PID controller - A Labview Application.
Till now, As per this forum discussion, I have completed the rotation count measurement of a compass C-100 device using Event structure and cFP controller.
Now I need to integrate the PID controller for thruster control according to the count value measured.
Could you please anyone guide me to start implementing the same. Please do the needful.
Thanks and Regards,
Dinsulpri.

Dear nathand,
Actually I need do a heading control application of a underwater system by using PID controller by the help of thrusters.
According to this,Firstly,I have completed the rotation count measurement of the system by interfacing the compass C-100 (for checking) with the cFP controller.It is working fine.
Now I need to do the PID controller part based on this count value measures, that is , I need to give the control signal to the thruster in order to release the twist of the system.
I just gone through the PID part in the labview and understood the concept and simulated the basic examples given in that.
My Understand as follows, Please validate the same and give me your suggesion on this,
1) Need to give Setpoint should be a thruster voltage .
2) I dontknow what to give in the process variable field.
3)Apart from this, how can I show this concept schematically with out connecting the thruster manually? Is it possible to show the demo in chart analysis format?
Please validate the above points and guide me to start working on this task.
The rotation count measurement application, Till now I did was attached with this. Please go through the same.
Thanks and Regards,
Dinsulpri.
Attachments:
Compass_Event Structure.vi ‏18 KB

PID controller on NXT

Hello,
I'd like to include a PID controller in my NXT-Program. But I can't use the LabVIEW Toolkit, because these VIs can't be compiled.
Howcan I realize such a control without PID-Toolkit?
Can show me anybody an example for implementation, please?
Regards, Maddien

Full PID control might be difficult since you would need to implement it from scratch, but simple proportional control is fairly easy. There is a good example of this in the book LabVIEW for LEGO MINDSTORMS NXT.
Message Edited by BLAQmx on 09-17-2009 09:59 AM
Mark
LabVIEW R&D

Factors to be considered while designing a PID controller

Hi ,
I am designing a PID controller for a temperature control system.
What are the factors should i consider to decide the PID controller range?
I have to adjust the heater voltage to keep the process temperature under control.
How to simulate the program without actually getting the process temperature??
Will the PID Controller work with any relation (for simulation purposes)between heater voltage and process temperature??
Am not an expert in PID controller.............
could someone guide me ...........
Thanks,
radhika

Hi Radhika,
For guidelines on setting parameters of your PID controller, you can search and find good information in books and all over the web (e.g. root locus and Bode plots).
As far as LabVIEW is concerned, you might want to take a look at the Control Design Toolkit, and its manual, available here.:
http://sine.ni.com/nips/cds/view/p/lang/en/nid/13854
And you could use something like a simulate signal express VI to simulate an input to your system.
Hope that helps! Take care,
-Sam F, DAQ Marketing Manager
Learn about measuring temperature
Learn how to take voltage measurements
Learn how to measure current

Usage of PID controller instead of ON OFF controller

respected sir,
I pursuing btech final year in the stream of instrumentation.sir i have a doubt while go through my project,can i use PID controller instead of using ON OFF CONTROLLER. would you please suggest me the possible ways which are going to implement in my final project intelligent wheel chair.i am eagerly waiting for your valuable acknowledgement.
thank you,
with warm regards,
BOMMAREDDY

Hi!
I am not sure if I completely understand the question but if you are wanting to do autotuning for PID there is actually a VI that will do it for you. It is called PID Autotuning.vi and can be found under the PID Control pallete in LabVIEW. The LabVIEW Help file also contains more detailed information on the inputs and outputs to the VI.
Carlton
CLD

Temperature control using pid controller

sir i ve a doubt that how should i control temperature at a particular value using this PID controller here i attach screen shot of my block diagram.please show me the path how should i controll
Attachments:
Capture.PNG ‏20 KB

Hi,
I am also looking for some what same situation. Did you get any answer?

About the auto tuning

there are notes i write but struggle hitting
the automatic tuning has never ( along with other things ) been explained as to how to do it
do you first record the raw take
then double click on it
and then move the slider ?
how do u save the altered loop /take?
is it done automatically ? if you use the slider on it
or
do i first move the slider then record the loop
very confusing
like the flex timing issue
thanks for your help

First, I think the Garageband supplied auto-tuner is a simple implementation, so it's not going to give you the same quality a more professional ( = expensive) plugin will give you.
But, it's not bad for fixing simple tuning issues.
Just record the raw take. If you want to have GB "clean up" the tuning on the track, you move the "Automatic Tuning" slider for that track to the right. If it's at 0, there is no auto-tuning applied. Progressively larger values cause more aggressive correction. You can play with the slider to find a setting that helps fix your problem without having the whole track sound artificial. Also note, this slider control applies to the whole track , not just a region. So if you only want to auto-correct parts of your recording, you'll need to create separate tracks and split up the original region, and drag those particular bad regions into the new track, and apply the auto-tune to just the regions on that track.
You don't save the altered loop, it's a real-time effect that gets applied when the track is played.

NXT PID Controller from PC

Hello,
I've implemented a PID controller on PC to control NXT Robot in this steps:
1. NXT sends the sensor value (Light sensor) to PC.
2. PC performs all calculations (PID controller and motor power for each wheel)
3. NXT receives the powers of motors and applies to corresponding motor.
With USB connection, robot follows the line very well and execution time is only 15 ms. But with Bluetooth, execution time up to 60 ms (!!) and the robot cannot follow the line properly.
Is it normal that Bluetooth has this latency? The only solution is to implement the PID controller directly on the NXT?
I've attached the robot's program.
Thanks!
Attachments:
Robot 9 (enviat).vi ‏20 KB

Bluetooth is always going to be slower than USB, and best performance would be doing the PID control on the NXT.
Can you attach your host side program as well so we can see how you are sending/receiving messages on that pc?
Are you using a mac with built in bluetooth radio? Sometimes people get better performance on mac with an external dongle.
Another option would be disabling the status check when a message is written to the NXT.
See the following vi:
C:\Program Files (x86)\National Instruments\LabVIEW 2012\vi.lib\NXT\DirectCommands\NXTToolkit.DC.MessageWrite.vi
There is a true constant on the diagram that specifies "requireResponse". This enables getting a response back that the messageWrite succeeded. I'm not sure how important it is, but setting that to false would reduce the number of bluetooth transactions in the loop by one.

Background job for auto lock user

Dear Friends,
Which background job i have to be schedule for auto locking user after every 30 days if then are not logged for last 30 days.
Thanks,
Regards,
Sachin

Hi, Sachin.
Please check this thread.
Locking users if they did not login for 15 days
Best Regards.
Sejoon

How do I turn off hierarchical keywording in LR 5? The interface preference for auto complete is off and I still get California United State Country. I just want Caliofrnia.

How do I turn off hierarchical key wording in Lightroom? The Interface Preference for Auto Complete is already turned off, but I still get California>United States>North America when all I need is California.

You need to be signed in order to reply to posts.
One reason why you may see the hierarchical type format for the keywords is that you have keyword 'California' duplicated in your keyword list.
Lightroom will display them with "< Parent-keywords" appended to the end.
ie California < State < Country and California < United States
If you re-keyword the photos so they only use one version and then delete the duplicate keyword from your keyword list then it will display just "California".
Bruce

Activating auto PO Check Box in the purchasing view for plant level.

Hi Techies,
Right now i have an issue related to auto PO check box in the purchasing view for the plant level. There are three plants A,B,C.. For the plants A and B the automatic PO check box is visible and the user is able to provide input values. But when it comes to plant C the auto PO field is not available and hence the user is unable to provide input for auto PO.
Is there any configuration to be done to activate the auto PO check box in the purchasing view in the material master with respect to plant C?
If so could you please guide me with the settings?
Thanking you in advance.
Regards,
Gopalakrishnan.S
Edited by: krishu100 on Jul 13, 2011 2:25 AM

Hi Techies thanks for you all info.
Now today i just tried to created a new HALB Material in the plant C which i had issues yesterday. But when i created today a new material the Auto PO feild is available for entry. THen i tried to go to the material which i created yesterday for editing it. But i was unable to do it.
I checked the transactions which most of you referred(Very Useful). I found that all the plant s had the same screen selction setting and set as Opt Entry. The field screen referrence for MM01, MM02 Transaction s are also set as opt entry. The screen reference for HALB is also set as Opt entry. Still i m not able to find the field auto PO in the purchasing field.
So does it mean that a material once created without auto PO enabled or visible can never be updated after that? But i think its not the case and we should be able to edit it(correct me if im wrong).
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Gopalakrishnan.S

How to run multiple CodedUI Ordered Tests over multiple Test Agents for parallel execution using Test Controller

we are using VS 2013, I need to run multiple Coded UI Ordered Tests in parallel on different agents.
My requirement :
Example: I have 40 Coded UI Test scripts in single solution/project. i want to run in different OS environments(example 5 OS ). I have created 5 Ordered tests with the same 40 test cases.
I have one Controller machine and 5 test agent machines. Now I want my tests to be distributed in a way that every agent gets 1 Ordered test to execute.
Machine_C = Controller (Controls Machine_1,2,3,4,5)
Machine_1 = Test Agent 1 (Should execute Ordered Test 1 (ex: OS - WIN 7) )
Machine_2 = Test Agent 2 (Should execute Ordered Test 2 (ex:
OS - WIN 8) )
Machine_3 = Test Agent 3 (Should execute Ordered Test 3
(ex: OS - WIN 2008 server) )
Machine_4 = Test Agent 4 (Should execute Ordered Test 4 (ex:
OS - WIN 2012 server) )
Machine_5 = Test Agent 5 (Should execute Ordered Test 5 (ex:
OS - WIN 2003 server) )
I have changed the “MinimumTestsPerAgent” app setting value
as '1' in controller’s configuration file (QTController.exe.config).
When I run the Ordered tests from the test explorer all Test agent running with each Ordered test and showing the status as running. but with in the 5 Test Agents only 2 Agents executing the test cases remaining all 3 agents not executing the test cases but
status showing as 'running' still for long time (exp: More then 3 hr) after that all so its not responding.
I need to know how I can configure my controller or how I can tell it to execute these tests in parallel on different test agents. This will help me reducing the script execution time.
I am not sure what steps I am missing.
It will be of great help if someone can guide me how this can be achieved.
-- > One more thing Can I Run one Coded UI Ordered Test on One Specific Test Agent?
ex: Need to run ordered Test 1 in Win 7 OS (Test Agent 1) only.
Thanks in Advance.

Hi Divakar,
Thank you for posting in MSDN forum.
As far as I know, we cannot specify coded UI ordered test run on specific test agent. And it is mainly that test controller determine which coded UI ordered test assign to which test agent.
Generally, I know that if we want to run multiple CodedUI Ordered Tests over multiple Test Agents for parallel execution using Test Controller.
We will need to change the MinimumTestsPerAgent property to 1 in the test controller configuration file (QTControllerConfig.exe.config) as you said.
And then we will need to change the bucketSize number of tests/number of machines in the test settings.
For more information about how to set this bucketSize value, please refer the following blog.
http://blogs.msdn.com/b/aseemb/archive/2010/08/11/how-to-run-automated-tests-on-different-machines-in-parallel.aspx
You can refer this Jack's suggestion to run your coded UI ordered test in lab Environment or load test.
https://social.msdn.microsoft.com/Forums/vstudio/en-US/661e73da-5a08-4c9b-8e5a-fc08c5962783/run-different-codedui-tests-simultaneously-on-different-test-agents-from-a-single-test-controller?forum=vstest
Best Regards,
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Circuit for auto tuning of pid controller in lab view

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