Help!!collect data at particular time intervals/cycles

Hello,
I have to write a program to collect data at particular time intervals/cycles. We collect data at 100 points per cycle for 5000 cycles. But due to the huge volume of data I have to collect at certain intervals ( say cycles 1-10, 29-31,49-51 .... 3999-4001 .. 4999-5000). I would appreciate if anyone could please help me with this program.
Thanks and bext regards
lax

Hello,
          Thanks for your reply. I have just started with LABview and the program I am dealing with was written by someone else. Anwyays, we are using a NI PCI 6259 data aquisition card and NI SCXI (these are data aquisition for each channel I guess). We collect the load and deformation data (using LVDTs), which is the primary purpose of the project. We apply a load for 0.1s and rest for 0.6s. We collect the data at 100 points per second for the whole test (which runs for either 90minutes or 5000 cycles). We just start the test and collect data all the way through and the rate of collection remains the same throughout the test.
          As for finding out when exactly the cycle starts and ends. We will have to find that with time I guess. We plan to collect data for the first 100 cycles, then for 2 to 3 cycles every 50 or 100 cycles (which may increase towards the end of the test, i.e. we might jump from 3000 to 4000cycles).As for collection we collect the data 1sample at a time.
         I have attached a part of the program which measures all the data (which is part of another program). Some VI's might be missing (DAQmx start task, DAQmx stop task, DAQ mx read). Please let me know if you have any solution. Thanks again.
Regards
lax
Attachments:
Measure_All_FastData_queue.vi ‏51 KB

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Saving data with automatic time intervals

Hi everyone
I am a new user with LabVIEW (I just started using it 3 weeks ago) and I am having a problem with data recording and saving.
Basically, what we want to do is to monitor data for four different variables countinuosly but saving them in automatic and specified time intervals. Specifically, we would like to save data countinuosly only for five minutes each hour. After the 5 minutes, only the saving function must be stopped for 1 hour then return to record for 5 minutes without shutting the major loop. Additionally, we would like to collect all the data in this way in one exel file per day for three weeks or more, so instead of creating a data file for each recording we would like to collect them in only one file per day.
Finally, if its possible, we would like to extract the mean of the data for one day in a single file. We are not interested in modifying the rate of data aquisition, we only want to focus on the saving rate. We tried many timed function (as Elapsed time, Time delay, Wait) and timed loops but it was impossible for us to syncronize different loops or to set up timing function for the saving issue without blocking the main loop work.
Data are collected throught the "write to measurement file" function.
any kind of help will be really appreciated!
Here we submit our front panel and block diagram of our VI.
Best regards
Solved!
Go to Solution.
Attachments:
Hypoxia 21-05-2014 Monitoring.vi ‏451 KB

Use a shift register to keep track of your start time. If the difference between the start time and the current time is less than 5 minutes, save the data. If the time difference is an hour, save the new time as the start time.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

How do get particular date of total time

this is our java code
    private static PreparedStatement preparedStatement;
    private static ResultSet rs;
    public static void main(String[] args) throws NamingException, SQLException
        int objectId;
        int clientId;
         DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        // String gpstime = null;
         PreparedStatement preparedStatement = null;
         Connection conn=null;
         long mill;
         long diffSeconds=0;
         long diffMinutes=0;
         try
          Class.forName("com.mysql.jdbc.Driver");
        Connection conn1=DriverManager.getConnection("jdbc:mysql://108.108.8.4:3306/navl?","root", "ajmani@%");
        preparedStatement = conn1.prepareStatement("select gpstime from xydata a inner join fm4features f on a.ID=f.ID where a.objectId= '18' AND a.clientId = '1' AND a.gpstime > '2010-05-11 00:00:00' AND a.gpstime < '2010-05-13 23:59:59' AND f.DataId='1' AND f.value = '1'");
        rs = preparedStatement.executeQuery();
        int a = 0;
        int b=0;
         int b1=0;
         int b2=0;
         int x=0;
         float secs = 0;
        Set<String> dates = new HashSet<String>();
        ArrayList<Integer> l=new ArrayList<Integer>();
          Timestamp t1 = null;
          Timestamp t2 = null;
          int count = 0;
          while ( rs.next() )
                String gpstime = rs.getString("GpsTime");
             if (dates.add(gpstime) )
                 //System.out.println(rs.getTimestamp(1));
                 t2 =   rs.getTimestamp(1);
                 count++;
               if (t1 == null )
                   int nano = t2.getSeconds();
                     System.out.println(nano);
                   System.out.println(nano);
                   System.out.println(t2);
                   System.out.println(count);
              else
                    mill= (t1.getTime() - t2.getTime())/-1;
                    //System.out.println(mill);
                    diffSeconds = mill / 1000;
                    diffMinutes = mill / (60 * 1000);
                    long diffHours = mill / (60 * 60 * 1000);
                    long diffDays = mill / (24 * 60 * 60 * 1000);
                    //System.out.println("\nThe Date Different");
                    //System.out.println("Time in milliseconds: " + mill+ " milliseconds.");
                    System.out.println("GPSTime " +gpstime+ " Time in seconds: " + diffSeconds+ " seconds.");
                    //System.out.println("Time in minutes: " + diffMinutes+ " minutes.");
                    //System.out.println("Time in hours: " + diffHours+ " hours.");
                    //System.out.println("Time in days: " + diffDays+ " days.");
              t1 = t2;
            //System.out.println("Time in minutes: " + diffSeconds+ " seconds.");
            if(diffSeconds < 80)
              b=(int) diffSeconds;
              System.out.println(b);
              l.add(b);
             else if(diffSeconds > 80)
                b2=(int)diffSeconds%60;
                System.out.println(b2);
                l.add(b2);
             a++;
          for (int i=0; i<l.size();)
              secs+=l.get(i);
              i++;
             System.out.println(secs);
             int hours = (int) (secs / 3600),
             remainder = (int) (secs % 3600),
             minutes = remainder / 60,
             seconds = remainder % 60;
                String disHour = (hours < 10 ? "0" : "") + hours,
                disMinu = (minutes < 10 ? "0" : "") + minutes ,
                disSec = (seconds < 10 ? "0" : "") + seconds ;
                if (count < 2)
                    int se = Integer.parseInt(disSec);
                    String min = (t2.getSeconds() < 10 ? "0" : "") + t2.getSeconds();
                    System.out.println("00" + ":" + "00" + ":" + min + " hh:mm:ss");
                System.out.println(disHour +":"+ disMinu+":"+disSec+ " hh:mm:ss");
         }catch(Throwable th)
           Logger.getLogger(testing1.class.getName()).log(Level.SEVERE, null, th);
         }finally
           if(preparedStatement!=null)
               preparedStatement.close();
           if(conn!=null)
               conn.close();
}this is output
GPSTime 2010-05-13 20:16:13.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:17:10.0 Time in seconds: 57 seconds.
57
GPSTime 2010-05-13 20:18:10.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:19:10.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:20:10.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:21:11.0 Time in seconds: 61 seconds.
61
GPSTime 2010-05-13 20:22:11.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:23:11.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:24:11.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:25:11.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:26:11.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:27:11.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:28:12.0 Time in seconds: 61 seconds.
61
GPSTime 2010-05-13 20:29:12.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:30:12.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:31:12.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:32:12.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:37:46.0 Time in seconds: 334 seconds.
34
GPSTime 2010-05-13 20:38:46.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 20:47:22.0 Time in seconds: 516 seconds.
36
GPSTime 2010-05-13 21:12:54.0 Time in seconds: 1532 seconds.
32
GPSTime 2010-05-13 21:13:54.0 Time in seconds: 60 seconds.
60
GPSTime 2010-05-13 21:14:55.0 Time in seconds: 61 seconds.
61
GPSTime 2010-05-13 21:37:08.0 Time in seconds: 1333 seconds.
13
GPSTime 2010-05-13 21:38:09.0 Time in seconds: 61 seconds.
61
31169.0
08:39:29 hh:mm:ssi am getting the total time for all date
i need only the particular date of total time
2010-05-11-->total time
2010-05-12->Total time
2010-05-13->total time
how do i change the given code to get the above output
please help me anybody having idea

Bakthavachalam wrote:
i am getting the total time for all date
i need only the particular date of total timeIn which case your while(rs.next()) loop needs to process 1 day at a time and print its results when the date changes (assuming your Timestamps come in in date sequence; if not, you'll have to sort them first).
I suspect you'll also have to decide what you want to do with
GPSTime 2010-05-13 23:59:59.0
followed by
GPSTime 2010-05-14 00:00:01.0
Do you still need to calculate the difference? And if so, which "date" does it go in, or is it split?
Your logic seems incredibly convoluted for such a simple task. What exactly are you trying to do?
Winston
BTW: TimeStamp.getSeconds() is deprecated, which means you use it at your peril.

'Overlapping Time Intervals' error while loading the Master Data

Guys,
          Need you help with this. I am trying to load the Master Data (attribute) for InfoObject 0FMD_FRSITM using DTP from DataSource 0FMD_FRSITM_ATTR and am getting an error 'Overlapping Time Intervals'.
This is happening due to overlapping Valid From/Valid To date's for the same Financial Statement Item (0FMD_FRSITM) with different Editions.
If I select the option 'Ignore Duplicate Records' while loading the data, it is successful. But not all the records are loads and Editions are missing.
Below is an example of how the data looks like.
FRSITM         Valid To                  Valid From                 Edition
1001             12/31/9999             04/01/2010                2010.1.1
1001             01/31/2010             03/01/2010                2010.1.2
1001             12/31/9999             02/01/2010                2010.1.3
In the above scenario, the Valid To Data for record 1 and record 3 is the same (12/31/9999) and the record 3 is being ignore when I select the option 'Ignore Duplicate Records'.
And also I see that the Edition is not the Key Field.
Any suggestions or ideas? Appreciate your help.
Thanks.

FRSITM Valid To Valid From Edition
1001 12/31/9999 04/01/2010 2010.1.1
1001 01/31/2010 03/01/2010 2010.1.2
1001 12/31/9999 02/01/2010 2010.1.3
1. While selecting ignore duplicate, make sure to-date is not part of symantic key.
2. if system comes across two same records it picks up the latest one.
3. It shall merge the timelines is overlap is found.
4. I hope Edition is time dependent attribute
I believe infoobjet key is FRSITM Valid To.
In your case because first record has more period and may be the latets record system ignore the earlier one with the same time interval.
have a look at Q table and you shall be able to figure out for your self.
Hope it helps
Vikash

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DTP got failes due to overlapping time intervals of data records

Hi,
Can any one suggest me how to solve this issue....
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Eg: For some employees the start date and end data are same.
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Immediate reply is realy appreciated.

Hi Shaik,
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You won't get any duplicate records, before loading the data DTP removes the duplicate records and loads into Master data.
So, you can avoid the duplicate records by checking this.
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I have a string 2012-05-22T23:23:42.263-07:00. so i want to convert in date with indian time zone can any one help me out

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To measure and save the data of an instrument for a particular time

Hello frds
the problem might be simple for expertise. However, i am relatively new in labview. I need to measure the data of an optical power meter for some time. for e. g 5min and store this measurment on. txt file. I made a VI. But, I am seeing data in real time waveformchart. donot getting an idea about how to store this chart data (x and y) in a file . The labview version in our lab is 7 which donot have data logging.
pls help me

Hi,
You may want to include 'Time-stamp' along with every data-point (sample from the instrument) you read. And after the desired period (in this case 5 minutes), you need to save both in a file (binary or text). Then on reading that file, you'll be able to display the data-points on a 'X-Y Graph'.
The code will look like:
Don't forget to customize the appearance of 'X-axis' display property as shown below.
As you're using LabVEIW version 7.0, I've saved the same code in version 8.0 (I can't further downgrade the code)
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.
Attachments:
Sample with Time-Stamp.vi ‏27 KB

Date Picker Incorrect time! URGENT HELP NEEDED

Hello
We have an application. In the application when you click a date picker the time is an hour forward. Where does the date picker get its time from?
We have alot of date pickers and we are not wanting to set them by a query.
The OS the machine application server is on is the correct time.
Even if I create an item and select sysdate from dual the time is correct.
Please help.

From the SQL Reference manual:
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Perform these two queries in SQL Commands:
select current_timstamp from dual;
select localtimestamp from dual;I'll bet you a million dollars that the query against LOCALTIMESTAMP is off by one hour from what you expect.
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You're welcome. Glad you got things sorted out.
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Transaction should run at a particular time once in a day.

I have a transaction and an Xacute query. I am fetching data from local database, and posting a measuring document in SAP R/3. Right now i have to run the transaction manuallly to post the document.
I want that my transaction should run automatically at a particular time once in a day (at the end of the day), and document should get posted in R/3 at the end of the day.
Can you help me out, how to go ahead for the same.

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In SAP MII Menu, In Left side Navigation,Go to
Business Logic Services---> Schedule Editor. In that window,select the transction you want to run and select the time pattern how fequently you want to run the transaction.
For more details : http://help.sap.com/saphelp_xmii120/helpdata/en/index.htm (for MII 12.0)
In above link select the System Mangement--> Shedule Editor.
http://help.sap.com/saphelp_xmii115/helpdata/en/index.htm (for MII 11.5)
in above link Business Logic Services---> Schedule Editor.
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Recording data at particular iterations and writing to text file

Hi all,
this is my first time posting on the NI boards. I'm running into a couple problems I can't seem to figure out how to fix.
I'm collecting data using a LabJack U3-HV daq. I've taken one of the out-of-the-box streaming functions that comes with the LabJack and modified it for my purposes. I am attempting to simply save the recorded data to a text file in columns, one for each of my 4 analog strain gauge inputs, and one for time. For some reason when the 'write to measurement file.vi' executes it is puts everything in rows, and the data is unintelligible.
The 2nd issue I am facing, which is not currently visible in my vi, is that I am running my test for 60,000 cycles, which generates a ton of data. I'm measuring creep/fatigue with my strain gages so I don't need data for every cycle, probably for the first 1000, then the 2k, 4k, 6k, 8k, 10k, 20k, etc. More of an exponential curve. I tried using some max/min functions and then matching the 'write to measurement file.vi' with a case structure that only permitted it to write for particular iterations, but can't seem to get it to work.
Thanks in advance for any help!
Attachments:
3.5LCP strain gages v2.vi ‏66 KB

Hey carfreak,
I've attached a screenshot that shows three different ways of trying to keep track of incrementing data and/or time in a while loop. The top loop just shows a program that demonstrates how shift registers can be used to transfer data between loops. This code just writes the iteration value to the array using the Build Array function.
The first loop counts iterations in an extremely round-about way... the second shows that really you can just build the array directly using the iteration count (the blue "i" in the while loop is just an iteration counter).
The final loop shows how you can use a time stamp to actually keep track of the relative time when a loop executes.
Please note that these three should not actually be implemented together in one VI. I just built them in one BD for simplicity's sake for the screenshot. As described above, the producer-consumer architecture should be used when running parallel loops.
Does that answer your question?
Chris G
Applications Engineer
National Instruments
Attachments:
While Loops and Iterations.JPG ‏83 KB

How to read from DAQ in different time intervals

Hello,
I am currently using LabVIEW 2010. I am new to LabView.
I have 9 thermocouples I want to record the temperature from and create a graph.
For one graph I want to graph the data every second for the duration of about 1.25 hours. For the other I want to record and graph the data every 2 minutes for a duration of 30 minutes. The temperature then would be ramped up in an oven and set to a higher temperature. When it is stabilized, recording of the data again will begin again at intervals of 2 minutes for the duration of 30 minutes.
The first is only to see the real time temperature variation while the program is recording and running. The second graph and data is what I will use to analyze.
What I need help in is finding out how you can read from the DAQmx at two different time intervals. I tried two parallel loops with each one graphing the two separate graphs I need with a delay time. Those two parallel loops where then surrounded by another while loop. The result is that the outside loop waits until both loops are finished so I do not get the correct results for the real time data graph.
Is there a way to call on the DAQ data you need at the time interval you desire? Any suggestions to solve this problem? Thank you for your time and help.

You are on the right track. Sample the data at the fastest rate and send it to the 1st graph. For the slower graph, take a sample from the faster data at your desired time interval. You could use a timer and a case structure for something quick and easy and still have everything run in the same loop. You could use two loops running at different speeds, it is just a little more involved and a few other things to consider.

Help!!coll​ect data at particular time intervals/​cycles

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Help!!collect data at particular time intervals/cycles