Synchronization of AO and output counter, arming and triggering the sequence of events

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  Database 11.2.0.2
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  NATHALIE wrote:
  Database 11.2.0.2
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  Kind regards
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  huh?

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  Hey thanks, that the explanation is logical. "Mallocing everything in desperation" will be my new go to words to describe my state of mind sometimes.

  Fixed it!, but it was something else. :

  I tried to uncheck "allow applications to take exclusive control it" box and rebooted, verified that the box was always checked... but the first has always had the same problem. The stop/play button icon changed as you noted, but the timeline not yet played.  This led me on a path of futzing with different combinations of audio material.

  Difficulty of summary:

  -First, change the 'default' output to some other active sound output (even if it is not physically used), then change it back.

  (1) in the first Audio hardware preferences, I changed "Default Output" for "Realtek Digital Output" (which is enabled in my sound control panel, but nothing is physically connected).

  (2) I went back to the first, and he could still play the timeline after alt-tabbing to other programs and return.  There was no audio since obviously I have nothing plugged on my outputs digital.

  (3) 'Exit by default' Changed in first preferences Audio equipment Audio back to "Speakers (Realtek High Definition)", tried the stuff of alt - tab again and as if by magic it worked like the good old days (early 2015).  Even still, it still works very well even though I have the checkboxe "exclusive control" ticked off now (parameters of sound from speakers in the Panel).

  Notes:

  -I don't know if step 2 is required.  Things are working fine for me and no matter what I change, I can't do things in the State 'broken '.

  -At some point, in the sound control panel, I changed one of the outputs digital to be default, but that doesn't seem to make a difference at first. Whether or not this has finally made a difference affecting the steps above, I don't know.

  BTW, audio installation is:

  Audio is Realtek High Definition Audio, version 21/08/2013 6.0.1.7023 (hardware Audio first output by default is "Speakers (Realtek High Definition Audio)"

  I have a 3 GB Evga 780 also graphics card, but no HDMI outputs are used/activated.

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• Synchronization of analog and digital output with the external sample clock

  Hello

  First of all sorry for my English, I will try to explain what I want to do.

  I want my PCIe-6321 to send two custom signals (modification sawtooths) on a mirror controller. I would also like to generate output with my card at the beginning of each tooth of saw. Everything must be synchronized with an external k-clock signal of 100 kHz. The idea is that whenever the PCI receives a trigger to external clock, it sends two analog output voltages and when he received 1024 clock ticks it will also send a pic of triggering TTL. What I do is first prepare the map and after that in a loop sending and modifing the output values of the two signals and at the same time send a digital signal Boolean in each arch, so when's done it 1024 iterations of the loop I send an event to the digital port. Attached you can see.

  The problem is that I don't know how to synchronize both. Can I use the sample clock just to the analog output? I can use sample for the two outputs clock, or do I need to use the output of the meter? If don't know how to use it here.

  If I do nothing else bad/wrong, I would be grateful for feedback.

  Thanks in advance,
  Pablo

  I don't know how but I find the solution. I'm generating more than a positive value (as I was triggered maybe very fast the oscilloscope has been absent there). If I put the sample clock of digital output to use the sampling/ao/Dev1 clock that it doesn't, but if I put to use the same source as the OD (terminal where my external clock is connected), but the trigger to start the DO to be Dev1/ao/StartTrigger this works. I don't really know why, but it does.

  Thank you for your patience and your help. I put here the final code.

• different output for max() with prescription and over-the-counter

  with t1 as 
  (SELECT 'case2' AS promo_id, to_date('8/20/2012','MM/DD/YYYY') as promo_start_dt, to_date('8/24/2012','MM/DD/YYYY') as promo_end_dt, '30' as qty from dual
     UNION
    SELECT 'case2' AS promo_id, to_date('8/26/2012','MM/DD/YYYY') as promo_start_dt, to_date('8/27/2012','MM/DD/YYYY') as promo_end_dt, '40' as qty from dual
     UNION
    SELECT 'case2' AS promo_id, to_date('8/27/2012','MM/DD/YYYY') as promo_start_dt, to_date('8/29/2012','MM/DD/YYYY') as promo_end_dt, '40' as qty from dual
    )
    select t1.*, max(promo_end_dt) over(partition by promo_id) max_val from t1
  
  promoid    promo_start_dt    promo_end_dt  qty     max_val
  case2      8/20/2012       8/24/2012           30     8/29/2012
  case2      8/27/2012             8/29/2012           40     8/29/2012
  case2      8/26/2012            8/27/2012           40     8/29/2012
  
  but why this below query is giving different output, the below query should also return the same output, adding order by promo_start_dt is giving different output
  
  with t1 as 
  (SELECT 'case2' AS promo_id, to_date('8/20/2012','MM/DD/YYYY') as promo_start_dt, to_date('8/24/2012','MM/DD/YYYY') as promo_end_dt, '30' as qty from dual
     UNION
    SELECT 'case2' AS promo_id, to_date('8/26/2012','MM/DD/YYYY') as promo_start_dt, to_date('8/27/2012','MM/DD/YYYY') as promo_end_dt, '40' as qty from dual
     UNION
    SELECT 'case2' AS promo_id, to_date('8/27/2012','MM/DD/YYYY') as promo_start_dt, to_date('8/29/2012','MM/DD/YYYY') as promo_end_dt, '40' as qty from dual
    )
    select t1.*, max(promo_end_dt) over(partition by promo_id order by promo_start_dt) max_val from t1
  
  giving output as 
  
  promoid    promo_start_dt    promo_end_dt  qty     max_val
  case2      8/20/2012       8/24/2012           30     8/24/2012
  case2      8/27/2012             8/29/2012           40     8/27/2012
  case2      8/26/2012            8/27/2012           40     8/29/2012

  Hello

  This is the expected behavior. Analytical functions still work on the lines in the order specified in the function order_by_clause and in the specified partition.

  So, when you treat the first row if ORDER BY is specified, it will calculate the function based on the first line, on the second, based on the first and the second on the third based on the three rows.

  If you do not ORDER BY then the analytical function is calculated according to the whole score.

  that is to say:

  WITH mytest AS (    SELECT 'A' p, LEVEL n
                        FROM DUAL
                  CONNECT BY LEVEL <= 10)
  SELECT p, n, MAX (n) OVER (PARTITION BY p) max_n
    FROM mytest;
  
  P          N      MAX_N
  - ---------- ----------
  A          1         10
  A          2         10
  A          3         10
  A          4         10
  A          5         10
  A          6         10
  A          7         10
  A          8         10
  A          9         10
  A         10         10
  
  WITH mytest AS (    SELECT 'A' p, LEVEL n
                        FROM DUAL
                  CONNECT BY LEVEL <= 10)
  SELECT p, n, MAX (n) OVER (PARTITION BY p ORDER BY n) max_n
    FROM mytest;
  
  P          N      MAX_N
  - ---------- ----------
  A          1          1
  A          2          2
  A          3          3
  A          4          4
  A          5          5
  A          6          6
  A          7          7
  A          8          8
  A          9          9
  A         10         10
  

  Kind regards.
  Al

  Published by: Alberto Faenza January 24, 2013 16:19

• How to synchronize the start of IT and relaxation the Scan list (DAQmx Switch)

  Hello

  I want to measure samples of N to the AI0 of Council NI PXI 4461. The measurement starts on a rising edge of a digital triggering provided to the PFI0 of the same Board. The measure is configured with samples of N/2 pretrigged. So far, everything is under control...

  Using an NI PXI 2567 Board, the signal applied at the entrance the 4461 (AI0) switches between a V2 and V1 signal. I would like to synchronize the switch between the two signals with the trigger signal applied to the input of the PFI0 Governing Council 4461. In order to obtain samples of N/2 of V1 and V2 samples N/2. Synchronization of 1 to 5 ms would suffice!

  My question is how to synchronize the start of acquisition of AI pretrigged of 4461 with the switch control given by the Council of 2567?

  Thank you in advance for your help...

  PS: the configuration of the system is:

  -LabView 8.5

  -Chassis PXI-1044

  PXI-4461 on slot 2

  Module 4-slot PXI-2567

  Hi Frederic,.

  I came back to this recently and used the following examples to run the desired synchronization.

  PXI-4461: Acq & graph tension-Int Clk - dig Start & Ref .vi

  Samples per channel = 1000

  Rate (Hz) = 10000.00

  Start the trigger Source = / [name of the instrument DAQmx] / PXI_Trig0

  Onboard start = fall

  Reference Source Trigger = DAQmx Device Name] / PXI_Trig0

  Reference edge = fall

  Trigger samples = Variable (100, 500, 900)

  PXI-2567: Switch Scaning-SW Trigger.vi

  Advance the output terminal full = / [name of the instrument DAQmx] / PXI_Trig0

  Scan list = / [name of the instrument DAQmx] / ch0-> com0.

  Scan list = / [name of the instrument DAQmx] / ch1-> com1;

  Hardware configuration:

  The PXI-2567 module controls an external relay that switches between the voltage of 5 V on ch0 and ch1 0 V.

  The PXI-4461 connects to the COM of the external relay and therefore reads 5V when ch0 is connected; 0 v when ch1 is connected.

  Procedure: The above examples are used in the following procedure.

  1. run the PXI-4461 VI.  A start trigger (falling edge) is necessary to start collecting samples before firing.

  2. launch the module, PXI - 2567 VI.  When ch0 is initially (and immediately) on com0, a trigger is sent to PXI_Trig0.  The PXI-4461 will begin to acquire samples before firing.

  3. - click on the "Connect to the next" button on the front of the PXI - 2567 VI module.  This sends a trigger to entry software for the PXI-2567 module and the transitions of the scan for ch1-> com1 list.  Once the PXI-2567 module remains (debounced), advanced complete relaxation is sent on PXI_Trig0 for the PXI-4461.  The PXI-4461 will begin to acquire samples after outbreak.

  Note: Instead of the trigger of the software entry, an external input trigger can be used (e.g. PXI_Trig1).

  Results:

  > Before instant release of samples = 100

  Delay is caused by the time of actuation of external relay.

  

  > Before instant release of samples = 500

  Delay is caused by the time of actuation of external relay.

  

  > Before instant release of samples = 900

  Delay is caused by the time of actuation of external relay.

  

  I hope that the attached screws and the explanation above helps you and/or other customers who have this problem.

  Best regards

  Chad Erickson

  Switch Product Support Engineer

  NOR - USA

• How can I pause and resume the analog output using DAQmx?

  I use a DAQ hardware to produce an analog waveform.  I would like simply to break the output of the wave and then resume where it left off.  I use DAQmx and LabVIEW 2011.

  I've seen examples that use a digital or analog break trigger, but I would take a break in the software only.  How can I do this?

  -Joe

  Hi Joe!

  I spent some time thinking about it and I realized that you can technically use a fundamental mission of the analog output, as you previously wrote that runs continuously. However, the generated output samples are controlled by the sample clock pulses, and can be manipulated to fit our needs "suspension."

  To do this, we will need another counter task that generates a pulse train (see our examples of shipping under material input and output > DAQmx > generating digital pulses > generate dig Pulse Train - Continuous.vi) that stops and starts the user to choose. This can be in another quite VI or controlled by software. We will use this as the task of our output sample clock.

  Then, the task of the AO, wire a constant to the sample clock source and select ' DevX/CtrXInternalOutput"based on the counter that you specified in the task of counter. You will need to choose "I/o name of filtration" and check the box that says "include advanced terminals' and right-click of the constant. See picture attached as a reference. In this way, the task of the AO is constantly running, but it generates only actually all data when the meter running task.

  

  Let me know if you have any questions!

  Have a great day!

• Synchronize loops control and Simulation

  When simulate control with adjustment of the LV systems and Simulation loops, I often have several loops running at different speeds. For example, I have a loop PWM works at 20 kHz, a loop running at 100 kHz data acquisition and a control loop to running at 10 kHz. How can I synchronize all these loops so that they stay on the same time basis? Of course, the main time base must be at least as fast as the fastest simulation loop.

  I tried to synchronize all the loops at 1 kHz clock (I'm on Windows), but each loop runs a period by beat of clock (for example my 20 kHz loop count progressive 50us by beat of clock, my number of loop 100 kHz up to 10 by beating of clock, etc.). I need all the loops to be synchronized in a main time base so the simulation time is identical in each loop, but each loop will be executed at a different pace.

  Any thoughts?

  Hello

  A quick suggestion - why you cannot run three systems in a single simulation loop, but have different sampling frequencies for the blocks for each system?

  Your system is fully digital, or a mixture of continuous and digital - we can simplify things if you can convert in discrete time.

  Hope this helps,

  Andy Clegg