Simulation of first order system

i want realize a simulation of first order system (K/(1+to*s)). i need to realize a sample system.
thank you for your help.

Hello,
You can find an example of a first order system at the following link:
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=C4B9DDC93090460CE034080020E74861&p_node=DZ52010&p_source=External
Best regards
Alexandre D
NIF

Similar Messages

Function transfert of a first order system (without any toolkit)

Hello,
I'm using a quite old LabVIEW version (6.0.1)
I'd like to simulate a system and its control.
Unfortunately I haven't enough money to buy a toolkit for this.
I'd like to do it without any toolkit
The function tranfert of my system is
H(s) = OUT(s) / IN(s) = K/(1+tau*s)
So I can write OUT*(1+tau*s) = K*IN
and so OUT = K*IN - tau*s*OUT
Inverse Laplace transform is
out(t) = K*in(t) - tau * d out(t) / dt
so the schematic should be
     K--|
          x----------(K*in)
in------|            |
                       +
                         -------------------------out
     tau---         -                  |
             | -------(tau*s*O)   |
            x                            |
            |-----<---d/dt-----<--
Input comes from a slider
and output goes to a scope
Is it possible to do it with LabVIEW ?
I have the following problems :
- I don't see how to calculate the derivative function of OUT
- I can't compile because LabVIEW seems not to like cycle in my diagram
Regards

Thanks for your .vi
But there is some problems...
First I don't understand how it works (sorry I'm a beginner)
I don't understand for example what is the difference between T and tau
(I have never use the "i" and the "+1" icon)
On your scope, I see that the initial condition is 0...
but the graph start at 0,5...
I don't understand why it is not possible to do a cycle in a shematic...
Regards
Attachments:
diag.jpg ‏42 KB
front.jpg ‏33 KB

First order control system for proportional valves

I am working on a proportional valve control program. We have four gas lines and it is desired to send four different gases through a combustion chamber sequentially. The close time for each valve is determined by the pressure measurement inside the combustion chamber. For instance, firstly, we let the nitrogen gas flows to the chamber, and the pressure inside the of it reaches 5 bars, we closed the nitrogen valve, and open the argon gas valve, and hold it opened until the pressure is reached at 15 bars inside the chamber and so on.
I was thinking on utilizing PID for control of these valves, however, one author from my institute said that you can not do this with a PID program, you can do that with a first order control system. Because in the system, it is not allowable to gases exceed their set points (set pressure values). PID controls the system with osilations around set point and after it provides the set value, but in this case, we are not allowed to exceed the set point (we may reach the set point slowly and asymptotically, but never exceed it).
I have not background on controlling hence I need your help. Could I do that with Labview? Is there a first order system control module in Control & Simulation Toolkit? And also where can I find examples, tutorials, etc. -if there are- about first order system controlling? Thanks in advance.
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what you are trying to do can be done with PID, but you would need to tune it to avoid overshot. But, most importantly, the use of the closed-loop PID will guarantee that your system will follow the setpoint, which can be a ramp going from the 0 to 100 % of the valve. The ramp on setpoint is a typical control technique to avoid overshoot of the system.
Now, if you look in the PID palette under Control and Simulation, you will see the function called "Lead-Lag". This function is a 'first order' system and you can define a pole and a zero for your system. If your objective is just make the change smooth, you can make the Lead-Lag to work as a "Lag" (make the lead zero) and apply to your system. here is an example:
C:\Program Files (x86)\National Instruments\LabVIEW 2014\examples\control\PID\Simulation - Lead-Lag.vi
If you need something more complicated than Lead-Lag, than I would you advice to use the LabVIEW Control Design and Simulation Module. There you can really develop more advanced controllers, like higher order filters or Model Predictive Control. But this also requires you to have a better knowledge of control theory...
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

First order RC circuit

"I just started working with LABVIEW 6.1,I am working on simulating the first order RC circuit where I need to show the input voltage(Square or sine) and output voltage across the capacitor on the same plot in the front panel.I am unable to figure out how to update the waveform at the output, I am using the Basic function generator.vi at the input and I tried to split the waveform of the input using generate waveform components and tried to update Y(data Values of the waveform),but doesn't work.Is there any other way I can generate the output wave form using the formulas I have for the out put voltage across the capacitor..Please help.
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Greetings, Vishnu;
As you may have discovered, Labview doesn't have the same modeling capability as, for example, Pspice. However , you can model just about any RC circuit using the filters toolbox, (order 1 butterworth) in your example.
If you want to show the filter response in the frequency domain, you will need to sweep the function generator, and then plot the output as a function of frequency. (You can use the WAVEFORM Max to read the values, and then plot it on a graph.
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Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705

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Hi All,
While creating the Process Order system has to validate the Batch field which comes under Goods Receipt tab. Please let me know is there any standard user-exit is there for this requirement.
Regards
Naveen

Dear Swapnil,
Thanks for the reply,
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Here are some links I've saved that talk about Win7 setup
Registry Cleaners http://windowssecrets.com/newsletter/putting-registry-system-cleanup-apps-to-the-test/
Be sure you have the default hard drive indexing OFF for all drives and folders!!!
http://www.pcworld.com/businesscenter/article/220753/windows_7_godmode_tips_tricks_tweaks. html
Temp/Cookie Cleaner http://www.mixesoft.com/
http://forums.adobe.com/thread/789809
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More Win7 Tips http://windowssecrets.com/comp/110127
Utilities http://windowssecrets.com/comp/110106 (Startup Solutions)
Win7 Help http://social.technet.microsoft.com/Forums/en-US/category/w7itpro/
Win7 Configuration Article http://windowssecrets.com:80/comp/100218
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Win7 Virtual XP http://www.microsoft.com/windows/virtual-pc/
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While creating the Transfer Order system is not picking Sale order stock?

Hi All,
In the B2B process the system is not picking the stock from from sale order stock while creating the transfer order? Please suggest.
Summary : Here we are creating the PR in the sale order and STO is created using the same PR to procure the materials from the WM plant to sale order plant. Since here intialy we are moving the stock to our sale order in WM plant and then picking the same. But while creating the Transfer order system is not picking the sale order stock in WM plant.
Regards.

C S Javali
Check in schedule line in transaction flow whether Transfer Req /assembly is checked or not
Regards
Pradeep

Servlet or jsp for online ordering system?

i'm new to servlet and jsp. i'm going to develop and online ordering which is still thinking to use servlet or jsp. If i want to develop a web-based ordering system with nice interface and most data will be retrieve from database, should i go for jsp? If choose servlet, will servlet able to do what jsp able to do?
thanks

If you're going to use JSP, only use it to produce HTML output. For complex logic like database access, use servlets. I suggest you have a look at this tutorial:
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/Servlets.html

Reg Update Order System Status

Hi,
My requirement is, while doing TECO (technical complete) of maintenance order I want to check for open reservation/requisition in maintenance order. and if we found any any open reservation/requisition then order status TECO will not update. maintenance order will remain in present status. any other update done in this order before TECO will save.
Please suggest how I can acheive this.
I tried to use uesr exit IWO0009 and BADI WORKORDER_UPDATE but not abe to update order system status in this point.
Please suggest me any EXIT or BADI or Solution for this requirement.
Regards,
Atul

Hi Atul,
Following codes can be help u for Open PR before TECO.
*& Include           ZXWO1U03
EXIT_SAPLCOIH_004
DATA: BEGIN OF IT_EBAN OCCURS 0,
        BANFN LIKE EBAN-BANFN,
        BNFPO LIKE EBAN-BNFPO,
        EBELN LIKE EBAN-EBELN,
        LOEKZ LIKE EBAN-LOEKZ,
      END OF IT_EBAN.
DATA: IT_AFKO LIKE AFKO.
DATA: BEGIN OF IT_AFVC OCCURS 0,
         BANFN LIKE AFVC-BANFN,
      END OF IT_AFVC.
DATA: X_AUFPL LIKE AFKO-AUFPL,
      X_BANFN LIKE AFVC-BANFN,
      STR TYPE STRING.
SELECT SINGLE AUFPL
   FROM AFKO
     INTO X_AUFPL
       WHERE AUFNR = CAUFVD_IMP-AUFNR.
IF SY-SUBRC = 0.
SELECT SINGLE BANFN
     FROM AFVC
       INTO X_BANFN
         WHERE AUFPL = X_AUFPL
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     FROM EBAN
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ENDIF.
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Transporting PI/XI object deletions beyond the first target system?

Hello,
we're running PI7.0 at the site I'm working at, and our PI transports are controlled via CMS.
I'm experiencing a problem in transporting Deletions of integration directory objects.
From Development to the first target Test system, the Deletions are moved through fine. This 'D' --> 'T 'transport forms the first track.
The second track moves the same transports from 'Q' (after being assembled and approved out of 'T') to 'I' and then to 'M' systems.
However, beyond the 'T' system, the Deletion objects seem to disappear off the transport!
Other items on the same transport (eg. object creations or changes), still get transported fine.
The outcome is that we seem to only be able to delete objects via transport in the first target system, not any follow-on systems.
Does anyone know what could be causing the problem?
many thanks
DaveR

Hi Marco,
For Java development, you will still use NWDI until the assembly step. The result will be a software component archive, which can then be moved over to CTS+.
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You also might want to take a look into the following document, which highlights the combination of CTS+ and NWDI:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a0d96022-9df5-2910-90b8-8e0580e0987e
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Best regards,
Dennis

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After a truely horrendous home move experience that could easily have cost me my job through lack of internet access, I am finally inching towards having infinity installed in my new house.
My phone line was activated late on Tuesday 28th August, with broadband appearing earlier in that day (only 3 weeks later than originally agreed, but that is a whole other story that nearly reduces me to tears when I think about it). BT had to wait until Total Broadband was working before they could place an order on their system for an Infinity upgrade. Because of the mess around my home move, BT Retail had agreed to pay the extra to Wholesale to fast-track my inifinty engineer appointment, so it would be in a matter of days not weeks from now.
So, Total Broadband became active on the day they said it would - 28th August.
I called them (no call back though I had been promised one for the day after activation) on the 29th to make sure Infinity would be ordered immediately, and fast-tracked. Was told that on their ordering system Total Broadband hadn't registered as being activated, but that it would hit their systems "today" (the 29th). They couldn't place an order for Infinity until Broadband had registered with them... I was assured that the order would be placed in the morning (on the 30th) and I would be called before noon with confirmation.
Today - the 30th. No call by noon. I call them at 12.45pm. No order for Infinity had been placed, but the operator would place the order immediately. However, no date could be given yet for the engineer appointment as that order would have to hit the engineer's systems before a fast-track appointment could be made. That would happen tomorrow (the 30th)!
Even then, I was offered a callback tomorrow but that could come any time between 8am and 8pm! I declined and have said I will call them tomorrow at 9am to find out the date of my engineer appointment.
Why does it take 24 hours for one system to pass information to another system with BT, even if it is within different subsidiary companies???
Why can a provisonal engineer appointment not be booked under special circumstances when it is clear an order will be placed?
This has been a thoroughly unpleasant experience from the moment I found out that my home move order had been moved back 3 weeks, and I had to find that out for myself, I wasn't told that by BT. It has caused me to lose my temper with operators who are trying their best but the systems they have to work with are woefuilly inadequate at handling the tasks they were designed to do.
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I detest how BT have made me feel and act over the last month. I just hope they try to bill me for the period when I've had no phone or email service....

It's typical, not only of BT but of pretty well all companies and public services that rely heavily on automation. The technology is by and large fast and efficient. On the other hand, when things don't follow the predetermined path, there is too often nobody left with the authority and nous to get things back on track. That would be expensive and play havoc with the financial model.
Look at the recent catastrophes at RBS and HMRC for example.
You can click the white star next to this message if you think it was helpful.

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Hi,
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regards
Ganesh

Hi
Can you post the exact message with number
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thyagarajan

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We are facing a problem, user enter sales order, system display " Lock table overflow", and using T-code VL02N, system display "You cannot block the transaction at the moment.
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Dear Sujit,
[Lock Table Overflow|Re: Lock table overflow]
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Best Regards,
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Hi,
I am using the configuration simulation to check the configuration results for BOM and Routing. However, I am unable to get the simulation of the Planned Order. What are the requirements to get simulation of the Planned Order in configuration simulation? I have set the configuration parameters - Process to Plnd/Prod Order and BOM explosion to multi-level. The BOM for my KMAT material also have semifinish goods which requires MRP. I am confused how come no components was selected during the simulation of Planned Order.
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Dear,
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Profile is released.
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Hi All,
we want to change the sales order system satus, then we found we can only do it in item level.since in one sales order we may have many items, if we change the system status by manually one item by one item, it cost time, I wonder in SAP 6.0 if we can do batch change sales order system status? If have, please tell me how to do it?
Regards,
Jagan

Hi Raj,
Thank you for the reply.The problem here is there are 100 line items in a sales order and user wants to change the item status (in the status tab in item level data) from A3-A4 ( example here is A0-SO created,A1-SO changed,A2-SO released,A3-PO created,A4-Delivery created,A5-SO closed) for all line items.In this Sales order 10 line items have not got the Goods receipt.But all other items have got.So he dont want to go to each and every line item to check and update the status of the GR,since it is time consuming process.So he is looking for the possibility in the header level like when he update the status in Heder level,it has to change the status in item level or if any item is not relevent for status change from A3-A4 (means the item present status is not in A3) it should throw a message.
Regards,
Jagan

Simulation of first order system

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