Put signal in control design loop

when i use control design designed a loop but i cann't use my own signal to trigle it. i want use sin wave to look up the loop's response
but how to put sin wave in the loop?And how to put output in graph? If i should display two different output in one graph. Thank you.

I have posted the VI. The value that I have labeled as "VITAL VALUE" is the one that I am trying to get the maximum for. It is displayed on the graph in red.
Thanks!
Attachments:
Sample VI.vi ‏74 KB

Similar Messages

Problem using PID toolkit and control design toolkit to design the closed loop system. (for DC motor closed loop)

Hi, i have facing some problem during i upgrade a project. This project is an opened loop system, it only achieved up to controlling the speed of motor, detecting the speed of motor, and switching the direction of motor while controlling the motor (This motor is a 12 VDC motor).
In order to improve the project, closed-loop dc motor control system will be implemented to correct the error of the motor's speed and maintaining the speed for the initial setting. I would like to use PID control method to do the closed loop system.
I already installed the PID toolkit V8.2 and control design toolkit V2.1.2, and i'm using DAQ usb 6221, LabVIEW 8.5
Below is my problem.
http://img177.imageshack.us/my.php?image=howtocreatethesetpointnx2.jpg
question: 1. How to generate a icon for set point? my setpoint is duty cycle...
2. How to feedback the output duty cycle to summing junction?
below this is my basic concept
http://img237.imageshack.us/my.php?image=closedloopbz5.jpg
Problem 2:
http://img357.imageshack.us/my.php?image=problem1yk2.jpg
question: Why PID toolkit icon cannot wire to cd series.vi?
Below is my original program...
http://rapidshare.com/files/140538836/pwm_generate-final_PSMII.vi.html

Hi Cyrus
Have you had the opportunity to see our
developer zone site on the PID toolkit? This article also has sample
code at the bottom that may help you in developing your application. I
have also linked below knowledge bases regarding setting a point
profile and generating a PWM from a digital output line.
PID toolkit
http://zone.ni.com/devzone/cda/tut/p/id/6440
How to generate a set point profile:
http://digital.ni.com/public.nsf/allkb/125F27AC143B6AFD86256C2B0004A4DC?OpenDocument
How to generate a PWM on a digital output line:
http://digital.ni.com/public.nsf/allkb/1561D31534F07D608625727900391114?OpenDocument
Thank You
Eric Reid
Thank You
Eric Reid
National Instruments
Motion R&D

Extract Signal Tone Information in Control & Simulation Loop

Hi,
I have a simple Block Diagram to try Control & Simulation Loop. I added a Sine Wave signal and a Waveform Chart connected to it. They work just fine.
I tried to add a Extract Single Tone Information , from Signal Processing, and connect it to the output of the Sine Wave generator but I do not know how to create a proper Time Signal.
I thought of storing the output of the Sine Wave in an array but I was unsuccessful since I could not add any shift register to this type of control loops.
Any help or suggestions?
Thanks
Attachments:
Control_n_Sim_Test.PNG ‏9 KB

Hi Siamak,
Thanks for your reply mate.
However, when I built a same BD as you posted on, it somehow didn't work. I also attached a photo of my BD here. I used the gauge to measure when I run the programme. The gauge shows there is no signal output after the "collector"VI (gauge no.13). would you please check it for me? Many thanks!
BR
Floyd
Attachments:
tone info extraction.png ‏134 KB

Control & Design Simulation Collector Problem

i had attempt to work out a collector in control & design simulation loop but i found that there is some problem
1. The data i collect is in horizontal form, how to change the data from horizontal to vertical?
2. The data i collect is not moving for the actual speed, did i collect data from wrong wire? Please correct me if i put wrong.
Thankyou very much
Solved!
Go to Solution.
Attachments:
1.xls ‏7 KB
DC motor control 3.vi ‏403 KB

Hi barp
Thanks for your reply, Erm for the second question, please take a look on the picture below. When the setpoint, desired speed is 500, the Actual Speed suppose osillating at 500 for instance (501, 502, 499), but in this case the actual speed is exactly 500, which is not the actual speed but is the desired speed.
My question is from the block diagram above, am i place the correct wire in the right way in order to collect the actual speed data?
and the solver is Runga-Kutta 1(Euler) is that same with Runga Kutta 1(RK1)?
Thankyou very much.

Using timer/counter with PCI-6221/USB-6210 to control timed-loop VI

Dear all,
I need to ask about two devices and one of their functionalities, PCI-6221 and USB-6210. For our NI-based system, we need to control some timings in a Timed-Loop vi, for that currently we are using PCI-6221 and we give external TTL signal (at 1 kHz) to it,
recenntly we need to make some changes and for that we found USB 6210 DAQ to be more suitable, but we need to clear ourselves on some specific things.
Can the counter/timers functions available in the either PCI 6221 or USB 6210 can be used to control the Timed-loop VI by giving external clock or by using their own internal clock source?
Although we are using external clock with the PCI 6221 but we want to know about the usage of their internal clock, also are controlling timed-loop also possible for USB-6210
Also... What if we use the RTOS, are they still able to control the timed-loop VI without giving any 'EXTERNAL CLOCK' and using the internal clock sources of the DAQs
Waiting for reply,
Bests,
RaJaf
Solved!
Go to Solution.

Ben,
I having read previous email which I send earlier with general overview, we discussed in more detail within our team and I am giviing the specific answers.
Please check in RED the most recent answers. Blue are the questions/suggestions by your side.
1.    Using Internal hardware clock of PCI-6221 would enable us get rid of external clock, but how to divert the internal hardware clock to the current settings. Any idea (can you provide us with some reference manul for otherwise). I mean is there some flag-bit etc. or VI
2.       Is it also meant that with the installation of RTOS the timed-loop can directly get the timing source from the internal hardware clock PCI-6221? --- How???
3.       In order to make desktop to work as RT system, what is the hardware (motherboard, processor, etc..) requirement? What are the LabVIEW modules (specific name) that needed to be installed? Our platform is LabVIEW 8.6. (Currently we have windows-7 with i7 core processor)
What kind of application are you intending for this system? ---- high-speed laser scanning system.
Are you most concerned about accuracy, speed, or responsiveness? To control the laser mirror scanner to move at 1 kHz or 2 kHz speed. On the other hands, using PCI-5105 (128 MB memory) as a DAQ for real-time/on-the-fly data processing.
Bests,
RAJAF

(Control Design & Simulation) State-Space block doesn't give output

I've tried and tried but can't get the State-Space block module to give me a graph / output.
I have no idea what the problem is and hope that somebody can help me. The numbers and calculations work in Matlab (Simulink) but i can't get it to simulate in labview.
Anybody got any ideas?
Solved!
Go to Solution.
Attachments:
Cavities.vi ‏30 KB
Matrixes.vi ‏27 KB

The problem is that you are assuming that LabVIEW executes left to right. Dataflow doesn't work this way. Your code as this:
does not tell LabVIEW that it has to execute everything from left to right. What is happening is that he is executing the 3 'island' of code in parallel and, in this case, it will have 'empty' values. You have to remove the local variables to make this work and dataflow paradigm will execute your code from left to right, as you want. here is the code:
Also, one more thing. Your input to the "CD Linear Simulation" is all zero. That means that you are trying to input zero input to a linear system, which will give you a zero output to the response. You probably do not want that since zero as input doesn't give you any more information. If you want to see how to system goes to zero after initial conditions, you should use "CD Initial Response". Or you should modify the input signal to the system. Please study this shipping example to understand how to use Linear Simulation and Initial Response:
C:\Program Files (x86)\National Instruments\LabVIEW 2012\examples\Control and Simulation\Control Design\Time Analysis\CDEx Time Domain Analysis.vi
Hope this helps...
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Control & Simulation Loop failed to compile

Dear Forum Members,
I have a problem with a Control & Simulation Loop program (attached) that just doesn't compile & run. I believe that the problem is associated with the 'Feedback Node' at the bottom of this Control & Simulation Frame since if this is taken out the program will run ok.
Can anyone please advise me if this 'Feedback Node' is incorrectly used or in violation of anything. I have tried various ways to overcome the problem i.e. initialising it at the start but nothing works. The error message that I received just says "VI failed to compile".
Appreciate any help with this.

Hello bunnykins,
The Feedback node really isn't a supported function in control design and simulation. The behavior you're reporting, and the work around are both documented in the know issues of the module here:
201449
Return
A Feedback Node on a Simulation Diagram causes the VI to fail to compile
The Feedback Node does not make sense semantically within a Simulation Diagram, due to the fact that most ODE Solvers will execute the diagram multiple times per iteration and may need to reject steps and try again, filling the Feedback Node with bad data.
Workaround: Use the Memory block from the Simulation Utility palette. If a delay of greater than 1 is desired you can chain multiple memory blocks in sequence.
Reported Version: 8.5
Resolved Version: N/A
Added: 07/31/2010
Applications Engineer
National Instruments
CLD Certified

Control design and simulation module

Hi,
I am new to Labview and i am trying to work on Control System design. I have downloaded and installed the Evaluation Module of Control Design and Simulation Module. The problem I am facing witht this is its not showing any control fuctions in functions Palette. While installing it said its installing only control design and simulation assistant. Please, can anyone help with this.
I am actually looking at this module to implement Sliding mode control for non linear systems. I would like to know if there are any examples to implement this??
Thank You.

Hello
The problem is the following. The version of LabVIEW that you are using does not match the version of the evaluation version of LabVIEW Control Design and Simulation Module (CD&SIM). If that happens, the installer will not select the support files for your LabVIEW. If you download LabVIEW 2011, then you must install CD&SIM 2011.
Now, the module in the current version does not have an example with sliding mode control. But using this module, you can easily implement the algorithms and simulation its result using the Control and Simulation Loop.
Hope this helps.
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Control, design and simulation

Hello everybody,
I am trying to run a simulation in Control Design and Simulation module. My simulation consists of various simulation systems. The subsystems are working as desired when run as separate units, but when I run the complete system, the subsystems fail to produce the output values.
I have not used any local variables or any discrete function vi inside a subsystem.
Where am I wrong ? Any help would be much appreciated.

I mean the indicators connected to various subsystems are inactive and don't produce any output values. I tried to find the error using the Error Cluster, but it didn't show any error. I am using LabVIEW 2011. I have attached the complete system including the subsystems. The individual systems are working fine. I changed the solver too, but the problem persisted. Please try to identify the error.
Barp wrote:
When you say: Fail to produce a output, what do you mean?
On the right side of the Control and Simulation loop you have the 'Error Out' cluster. Create a control from it and see if you have an error. Also, which version of LabVIEW are you using?
If this is not producing an error, then try to change the solver you are using. It would help if you could post your code (or at least pictures) of it.
Attachments:
Wind Turbine Integrated.7z ‏2240 KB

Control Design and Simulation and DAQ

I'm learning Control Design and Simulations. I have some questions about it.
1. For System Identification use, we can find the transfer function/model of the system by feeding data measurement from the system. But, how long data do we need to be sufficent for Identification System to estimate the model? Until the get saturated value (steady state)? or any other intervals? What if the system is unstable? How will Identification System Toolkit estimate that case?
2. For connecting to hardware, we just connect the clock in the simulation loop to the hardware? And the simulation loop will simulate the blocks inside once it got the trigger/data from the DAQ? what about the step time and solver? Do they follow the timing from hardware? or they will run on their own supplied values/clock?if we use USB DAQ, we can't have any clock from it (as far as I know it's because USB connection is not that stable for clocking since it might be any jitters or delays.) So, how do we configure the timing parameter for USB DAQ?
3. There is possibility to convert model in transfer function to state space, how do we know the states inside that conversion?
Any helps would be great...
Thanks in advance...

Dear Chin ho,
After going through your questions I found some documentation which will be useful for you. But I you still have more questions, you can reply me any time.
1- About the data and amount of it I couldn't find any info but maybe you can use the new functions in LV version 2009 and find your answer.
Estimating States of Nonlinear Stochastic State-Space Models with Extended Kalman Filters
In previous versions of the LabVIEW Control Design and Simulation Module, you can use the Discrete Kalman Filter function and the Continuous Kalman Filter function to estimate the states of a linear discrete or linear continuous stochastic state-space model, respectively. In the LabVIEW 2009 Control Design and Simulation Module, you can use the Continuous Extended Kalman Filter function and the Discrete Extended Kalman Filter function to estimate the states of a nonlinear continuous or a nonlinear discrete stochastic state-space model, respectively.
The Continuous Extended Kalman Filter function and the Discrete Extended Kalman Filter function estimate model states of a partially observable plant based on noisy measurements. First, use the SIM Discrete Nonlinear Plant Model template VI or the SIM Continuous Nonlinear Plant Model template VI, located in the labview\templates\Control and Simulation directory, to define the system model. Then use the the Discrete Nonlinear Noisy Plant function or the Continuous Nonlinear Noisy Plant function to simulate the discrete or continuous nonlinear model, respectively, with the addition of noise. Finally, use the Continuous Extended Kalman Filter function or the Discrete Extended Kalman Filter function to estimate the states of your model.
The Continuous Extended Kalman Filter function and the Discrete Extended Kalman Filter function linearize the nonlinear system either by calculating a Jacobian matrix internally or by using an external Jacobian matrix that you define. Use the SIM Continuous Jacobians template VI or the SIM Discrete Jacobians template VI, located in the labview\templates\Control and Simulation directory, to define an external Jacobian matrix.
Refer to the LabVIEW Control Design User Manual, accessible by navigating to the labview\manuals directory and opening CD_User_Manual.pdf, for more information about estimating the states of nonlinear stochastic state-space models with extended Kalman filters.
2- I think that I found a pdf document about this part of your question which will be helpful. If you would like to give your email address, I can send it to you.
3- About this part you can check the help function in LabVIEW when you open the "CD Convert Transfer function To State-space" function in your front panel.
I pasted some info about the mathematic part below.
The LabVIEW Control Design and Simulation Module provides tools to study the dynamics of systems described by linear time-invariant (LTI) continuous and discrete models. You can create deterministic state-space, transfer function, and zero-pole-gain models. You also can create stochastic state-space models and the second-order statistics noise models. You can use these forms to describe both single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems.
Continuous transfer function and zero-pole-gain models use the s variable to define time, whereas discrete transfer function and zero-pole-gain models use the z variable to define time. Continuous state-space models use the t variable to define time, whereas discrete state-space models use the k variable to define time.
Deterministic State-Space Model
Continuous
x(t) = Ax("t) + Bu(t)
y(t) = Cx(t) + Du(t)
Discrete
x(k + 1) = Ax(k) + Bu(k)
y(k) = Cx(k) + Du(k)
Stochastic State-Space Model
Continuous
x(t) = Ax(t) + Bu(t) + Gw(t)
y(t) = Cx(t) + Du(t) + Hw(t) + v(t)
Discrete
x(k + 1) = Ax(k) + Bu(k) + Gw(k)
y(k) = Cx(k) + Du(k) + Hw(k) + v(k)
Second-Order Statistics Noise Model
Q = E{w . wT} – E{w} . ET{w}
R = E{v . vT} – E{v} . ET{v}
N = E{w . vT} – E{w} . ET{v}
where
t is continuous time.
k is the model sampling time multiplied by the discrete time step, where the discrete time step equals 0, 1, 2, …
x is the model state vector.
u is the model input vector.
y is the model output vector.
w is the process noise vector.
v is the measurement noise vector.
A is an n × n state matrix of the given model.
B is an n × m input matrix of the given model.
C is an r × n output matrix of the given model.
D is an r × m direct transmission matrix of the given model.
n is the number of model states.
m is the number of model inputs.
r is the number of model outputs.
G is a matrix relating w to the model states.
H is a matrix relating w to the model outputs.
Q is the auto-covariance matrix of w.
R is the auto-covariance matrix of v.
N is the cross-covariance matrix between w and v.
E{} denotes the expected value or the mean of the enclosed term(s).

Configuration error in PID synthesis step of control design assistant

Hello,
I am exploring an evaluation version of NI LabVIEW Control Design Assistant 2011. For getting started with it ; I am using getting started tutorial provided in the labview signal express help. Upto the step of frequency domain analysis it is working fine ; but when I insert step called PID Synthesis it is showing me an error like...Configuration error -Sampling Time number is not the same...Though I have followed all the steps mentioned in the document sequentially why am I getting this error?..Please educate me in this regard.
Best Regards.

I am having the same issue trying to install EM Grid Control 10.1.0.2 on a 9.2.0.5 Repository on HP-UX platform. I am wondering if you have found a solution?
Thanks,
Dawit

Control & simulation loop, VI failed to compile

hi!
I want to simulate asynchronous generater. but I cant run my VI. It failed to compile. I have read some reason in this forum but I cant fix It. who can help me!
the name of main VI is: mpdb_2.vi
thanks you!
Attachments:
MPDB_2.zip ‏1951 KB

Which version of LabVIEW are you using?
In 2013, the error says: Tmech_Ef_1.vi 'Tmechc_Ef':subsystem has illegal term names. And in analyzing the subsystem, I noticed that the Enum where you choose "EF or Tmech" has a "2 <space>" as a label.
To fix this, just put simple name without spaces in the beginning or the end of the name. In doing this, the VI is runnable.
Now, another note: I noticed you are trying to pass paraemters between Mathscript and Control Design and Simulation. We have a feature called Parameter Hierarchy that you can just transfer information between both Models of Computation without going through the wires. Also, we do have a plug-in for Mathscript that you can just use for this purpose. Please see shipping examples in the links below and documentation for more information:
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Simulation\Mathscript Integration
C:\Program Files (x86)\National Instruments\LabVIEW 2013\examples\Control and Simulation\Simulation\Get-Set Model Parameters
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Adding Proportional control using NI LabView Control Design Toolkit

I was just wondering is it possible to add a proportional control to your program using the NI Control design toolkit? There is a PID control fuction available, but i just want the P
Thanks

LC87,
A proprotional controller is equivalent to a multiply, so you could just create a transfer function with Numerator=[Kp] and Denominator=[1]. You could also use the CD Create PID Model (Parallel) with zero wired to the Integral Gain (Ki) and Derivative Gain (Kd). If you are going to implement this in a Simulation Loop, then all you need to do is use a multiply primitive.
Chris M

To put it in a FOR loop

Dear anyone,
I have written a code which calculates averages for 26 different groups. Attached the sample code in .txt file for reference. I would like to put it in a FOR loop to avoid writing a lenghthier code to calculate averages for 26 different groups. Attached code contains average calculation for 2 groups.
Request you to help for the same.
Regards,
X. Ignatius
Solved!
Go to Solution.
Attachments:
looping.txt ‏3 KB
looping.txt ‏3 KB

Simy,
I couldn't find out what was wrong. Attached the error screen for reference.
Regards,
X. Ignatius
Attachments:
error.pdf ‏264 KB
error.pdf ‏264 KB

OpenScript: Which files to put under Version Control?

Hi,
According to JB's description of [how to enable Subversion|https://forums.oracle.com/forums/thread.jspa?messageID=10677356] for OpenScript, I have now an active version control.
The next question is now: which files I should put under version control? Obviously, the script.java is a good decision, but there are many more, such as java, properties, but also specific folders like "recorded data" and "results" folder.
Which once I should put under version control, any recommendation?
Thanks a lot in advance!
Volker

Thanks for your replies,
it's nice to know that I was going the right way.. :)
But how do you handle these little bugs, that I mentioned in my first message? Do you check-out all files in the project before work? Or they are TeamSystem - specific?
Best wishes, Serg.

Put signal in control design loop

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