Resolution of timestamp in DSC

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• Amnesty International and counter sync + USB signal stream (USB-6210 vs USB-6341)

  Hi all

  I'm at a stage of identification of a material suitable for the following tasks:

  • 5 analog inputs (AIs) of reading at the same time, tensions at a rate of kSps (at least) 10,
  • application captures 2 inputs using timers (detection of contours with timestamps), square wave entry with duty ratio of 50 percent and about 1.5 kHz frequency and variable pulse width / frequency (from 2 sensors hall, representative of the DC motor rotation speed and direction, quadrature signals), resolution of timestamps should be (at least) 50 ns,
  • AIs and counters should behave in a deterministic way, and must be synchronized in a way,
  • data to be transferred via the USB port of a host computer with Matlab Data Acquisition Toolbox (unfortunately not LabVIEW).

  I've identified the long USB-6210 USB-6341 and potential candidates of material to accomplish the above tasks, but after reviewing several documentation and the topics of the forum, I'm still a bit confused, if both are fully working and my approach described below is not working properly.

  Counters: I intend to use the internal time base available 20 MHz as being the source of meter to get into account the resolution of timestamp 50 ns. External impulses hall are used as sample clock (about 1.5 kHz, see above). As the pulse width varies, the sample clock is not constant.

  AIs: Using a 10 kHz internal clock signal derived from the time base of 20 MHz for timing and analog inputs (trigger) start-up and counters simultaneously material should translate into the required synchronization and deterministic behavior.

  It work? Other recommendations?

  Next is the USB data transfer: all HAVE 5 and 2 data entry of the meter must be correctly transferred to the host computer (the corresponding rates are shown above). USB-6210 is capable of 4 USB signal flow, device USB X range (6341) offers 8 of them. Unfortunately, I could not understand the exact meaning of the expression "signal flow" still. Do I need 1 flow of input signals (would be 7 for my application described) or 1 stream for all analog inputs and 1 for counter inputs (lead 2 streams for my request). Is there no further details on this approach (more than Streaming of signals of NOR) USB signal flow?

  Any challenge to the described application that I might have forgotten? 6210 USB seems to a very limited number of entry PFI, maybe even too low for my meter participate application?

  Looking forward to your comments and advice.

  Concerning

  jAwA

  1. I recommend the X-6341 series on the M-series 6210 sake of counters/timers.  It is more of them, and each of them is more capable.   It can also have a great FIFO embarked for meters that may be important in certain tasks, although I don't think that you currently deal with one of them.

  2. your general concepts on timing & sync are satisfactory.  You will be able to share and to route signals that help ensure synchronization and determinism between the timestamps for your various tasks.  Note that for meter entry tasks, you need set up the trigger 'Arm Start' rather than the regular start trigger.

  3 is not authoritarian, but I believe that the flow of signal # will correspond to the tasks #.  For you, it would be 1 task of HAVE and tasks CI 1 or 2.  (Not clear if you have 1 Encoder with 2-channel quad that would require 1 task of CI, or if you have 2 encoders with 4-way quad).

  4. pay attention to the hall effect signals that are not virgins.  Digital filtering is available and probably better on the X-series, the series M.

  5. strictly speaking, edge detection is a type of digital input task that produces samples but no timestamps.  Ideally, I would like to parallel wires on the two digital inputs for the entries of detection and counter change to position quadrature decoding.   Then I would sample the counters Encoder 1 or 2 using the internal pulse 'event of detection of change '.  I would create another counter timestamp change detects pulses as well.

  -Kevin P

• Representation of like SGL timestamp?

  Hi all

  I'm saving the binary data in the course of an application of the RT and want to convert them to ascii. I'm planning to use sgl representation for stored data to reduce the size of the file. However, using means sgl who gets the timestamp 'chopped' (i.e. we don't get to the amount of minutes in time, not dry and millisecs). So, I was wondering if there is anyway to a

  (a) get the timestamp information full of a number of sgl (i.e. using the number of timestamp vi...)

  or

  (b) when you save a timestamp, is it possible to ignore the part date (would cause in my case)? I ask only assuming that I could skip the date part then sgl representation would be enough to give me up to milliseconds.

  Thanks for your time,

  Harry

  A timestamp uses 64 bits to contain the number of seconds since the 1,1,1904 and another 64-bit for the fraction of the second current. You can not far with 32 bits that SGL gives you and you cannot 'jump' the date, because it is an integral part of the number.

  One thing you can do is create a new era instead of 1904, but if you take 10 bits to get the resolution of ms, that leaves you with 22 bits for seconds, which isn't very long.

  What you can do is this:

  1. Take the timestamp and tick counter value at some point in time before you start (t0).
  
  
  2. Have a VI that will give you the run ms value by subtracting the number of cycles of t0 in the current number of cycles.
  
  
  3. Save the t0 timestamp in a header in your file.
  
  
  4. Save the real time as the time you get to step 2 (which is a 32-bit integer).
  
  
  5. When you want to calculate the current timestamp, just do t0 (from the header) + counter.

  This should be good for about 50 days of action, after which the number of cycles longer rolls.

  There are probably some existing formats where configure you this, but I have no experience with it.

• variable sharing, missing data, the timestamp even for two consecutively given

  Hello

  I have a problem with missing data when I read a published network shared variable.

  Host VI:

  In a host of VI on my laptop (HP with Windows XP Prof.) I write data to the shared Variable 'data '. Between two consecutively write operations is a minimum milliseconds of wait time. I use it because I want to make sure that the time stamp of each new value of data is different then a preview (variables shared the resolution is 1 ms)

  VI target:

  the VI target cRIO-9012 bed only of new data in the way that it compares the timestamp of a new value with the time stamp of the last value on a device in real time.

  Problem:

  rarely, I'm missing a data point (sometimes everything works fine for several hours, transfer thousands of data correctly above all of a sudden failure occurs). With a workaround, I'm able to catch the missing data. I discovered that the missing data have the timestamp exactly the same, then the last point of data read, is so ignored in my data 'legal '.

  To summarize, the missed value is written to the variable shared host, but ignores the target because its timestamp is wrong, respectively the same as the last value, despite the host waits for a minimum of 10 milliseconds each time before writing a new value.

  Note:

  The shared Variable is hosted on the laptop and configured using buffering.

  The example is simple only to display the function of principle, in real time, I also use a handshake and I guarantee that there is no sub - positive and negative.

  Simplified example:

  

  

  Question:

  Anyone has an idea why two consecutively data can have the same timestamp?

  Where timestamping (evil) Finally comes (System?)?

  What would be a possible solution (for the moment with shared Variables)?

  -> I tried to work around the problem with the clusters where each data gets a unique ID. It works but it is slower that comparing the timestamps and I could get performance problems.

  It would change anything when I animate the shared on the RT System Variable?

  Thanks for your help

  Concerning

  Reto

  

  This problem has been resolved in LabVIEW 2010.  You can see other bugs corrections in theReadme of LabVIEW 2010.

• Timestamp in milliseconds

  I'm trying to calculate the time elapsed since the datatypes with the millisecond timestamps (or better) resolution.

  If I use a feedback loop node and subtract the iteration previous Timestamp of the current iteration value Timestamp value, I get a Delta t, but only at 1 second resolution.

  I think that the timestamps are a compound of an I64 (per second) and U64 (for subseconds), but can't find a way to break the timestamp in these two components.

  Rick

  PS: I need to do with data types Timestamp as the data via a datasocket comes downstream, another system that is doing the time stamp and I can't change that.

  Second, it's an I32 and fractions of a second is a DBL...

• Get track List - Last Timestamp returns a time one hour behind

  Hello

  I use the DSC module to create traces.  I need the timestamp of the last of a trace.  When I go to the track via MAX (export to text file), I see all timestamps in the trace.  When I use the "Get Trace List.vi" it returns is an hour behind.  I would make up for just an hour, but I thought that I saw that it compensates for return after writing again.  I have a complex code, and after having thought about it, I think the "Get Trace List.vi' should work.  I tried to turn the time zone but this makes no difference.  A solution I just think now is to use the track of the reading, but use a more recent time interval.  In my case I do not know the more lately but if I got the data from last month and used the max/min chart on the table timestamp incomming; It would work.  OK, so I thought about a work around, but maybe someone knows something about why this last time stamp is an hour off the coast?

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• TDMS 1 d table timestamp

  Nice day. I have problem with PDM, this is the first time that I used it and I'm a newbie to labview. I have a table 1 d ~ 100 data values that each represents a different signal. The data comes off the serial port and labview reads ~ 200 Hz refresh rate. Now I download a vi on site or to write the table 1 d in a PDM file. This works very well and can read today in Excel, but I would add a timestamp. Each block of 100 values should have the same timestamp thay are essentially read at the same time. What is the best method to achieve this. It would be nice to add another element to the table, but the data are 32-bit integers. I would like to have resolution 5ms. Is there another way?

  Thank you

  John

  Given that all channels have the same time stamp, you could add a timestamp type channel and write the timestamp for each analysis to this channel.

  You could save the loops by storing interlaced data.

  Because you store unique values for each channel, your file can become fragmented fairly badly. You can use the NI_MinimumBufferSize property to prvent who.

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• shared variable of mutual FUND not updated of DSC

  Hello world

  I have some problems with shared variables and the OPC Client IO server functionality in Labview 8.6.1. I have the DSC module installed as well.

  I use a lonworks OPC server a company called us. I am able to monitor my traffic lonworks successfully using this software. I set up a server of e/s of Client OPC called Lon server in my library. From there, I've added a shared variable called nvoUI [1] in a simple VI. When I run this VI, I get no errors or warnings, but I have also no output, either in the data field or the timestamp. I read a lot of documents on the forum and knowledge base, but I could not do this work.

  I have attached a picture of my setup project and in my opinion of OPC server, along with a photo of my diagram VI and the front panel. I hope someone can help.

  Thank you

  Dale Borelli

  Just to wrap things:

  I realized that my problem was multi-party.

  (1) suggestion of the cancellation of the deployment of all of my libraries deployed Charlie was a good, I got a lot of active libraries which were all referencing the same variables on my OPC server, which may have caused problems. I knew not that libraries remained deployed, a bit silly, I assumed that they were cancelled when the associated project has been closed.

  (2) I didn't know at the time, but I had several copies of my OPC server on my local machine. A copy has been started automatically in the background when I started to labview. It does not appear in the taskbar or system tray. I only found it by looking in the Task Manager.

  By cancellation of the deployment of my unused libraries and a second instance of my OPC server won't start not, I could get my shared variables to work properly. Thanks for your help Charlie.

  Dale

• Conversion problem 8i to oracle 11g database timestamp

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  When we try to send the timestamp from 8i to 11g, time stamp values are coming as parag 00:00:00.
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  ---------------------

  Here is the screenshot of the problem:

  The timestamp of the last message is 09:04. -> > >

  

  -----------------

  Below, I've removed the last message (which was the time stamp 09:04), so that the last post time is 12:41 am logically. -> > >

  

  ---------

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  ------------------

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  -------------------

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