Parallel counter operation
Hi,
I am trying to use two counter from the same card in paralle. I have attahed the VI here. I used the example VI to generate finite pulses to prepare my VI. Iam using PXI-6722 hardware.
Can this operation be done? How to avoid the conflict?
Regards
Gopal
Attachments:
Parallel Counter operation.vi 34 KB
Hello Gopal,
You are receiving this error because you need both counters on the device to perform a finite pulse train generation task. You can see this Knowledgebase for more information about the problem.
Matt Anderson
Hardware Services Marketing Manager
National Instruments
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Confirmation of parallel sequence operation.
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I want to do confirmation of parallel sequence operation. I use 3 or5 work centers at a time for doing one operation. So i have defined parallel sequences for standard sequence. When I do confirmation of quantity and activity time in CO11N for one parallel sequence, other sequence quantity and activity time should be decreased. But system takes actual quantity and time.
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Waiting for Reply!Dear ,
You are not able get the paralle sequence operation in CO11N because production order will copy the Routing based on the Order Type dependent paramter-OPL8-Routing set up.
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Counter operations in PXI 6722
Hi,
What I want to do :
My application requires generating an analog output, after some time the DUT responds with a pulse of 1.5ms duration. I need to find the time between the point where I genrate the AO and the point where I get the pulse.
What I am planning to do :
I plan to start a counter at the moment I start the AO, the input pulse to counter would be a pulse train from an external clock or another counter output. I would like to stop the counter using the pulse from the DUT by connecting it to the GATE terminal. The idea is derived from the example vi, Count Digital Events-Pause Trig.vi. Based on the number of counts and the pulse train frequency, the time can be measured.
Problems Faced and queries:
1. I tried to test the idea by generating a continuous pulse train from counter_0 and feeding it to the source of counter_1 and use the above example to count the pulses. Here I can only pause the count using the gate input. How do I stop the counting and get the count value using the Pause trigger property?
2. If I want to use the internal clock base instead of using another counter, how should I enable this?
3. Is there any other option to measure the time I need?
4. When Iam using the generate finite pulse train vi in counter_0 and connecting it to Counter_1 source. Using the count digital event, I try to count the events. Error is generated with a reason that there is a hardware conflict. Can I not use different counters in the same card for generating a finite pulse train and counting them on the other counter input?
Regards
GopalHi Gopal,
Thank you for posting to the NI forums. You can use a digital start trigger and a reference trigger to get the functionality that you need. There is a nice Knowledge Base article on this exact issue. The link is below.
How Do I Use a Digital Trigger in LabVIEW to Start and Stop Acquiring Data?
Using the information in this KB, as well as the info in the related links, you should be application to program your application in LabVIEW, but please post back if you have further questions.
Ed W.
Applications Engineer
National Instruments -
Hello,
I have a question on how the implicit timing on a frequency input works. I am inputting a straight frequency into a counter input on a cDaq unit. I set it up using the 20Mhz Timebase. and counter 0, However If for example I input a 10Khz frequency and read data from the read counter vi every 10ms I would expect to see 10,000 * .010 samples or ~100 samples per read right? I am only seeing about 10 samples per read though. Am I not figuring something right? I am setting up the sample clock as implicit using parameters (continuous, 200000 buffer size).You should read the section in the 917x User Manual entitled Choosing a Method for Measuring Frequency. In summary:
The one counter method loses accuracy as frequency increases.
The two counter (large range) method is the same as the one counter method but it takes the measurement over N consecutive periods which allows you to increase accuracy at the expense of measurement time. To get a reasonable accuracy at high frequencies however would require your low frequency measurements to take a very long time.
The two counter (high frequency) method loses accuracy as frequency decreases.
The sample clocked method has good accuracy at all frequency ranges and maintains consistent measurement time.
The sample clocked method should be the obvious choice for measuring a large range of input signals. However, it comes with the caveat that your input signal must be faster than the sample clock or you will receive an error and have to restart the task (which might not even be an issue depending on synchronization requirements). You'll probably end up using a second counter to generate the sample clock.
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there is a production order.
the control key of the last operation is PP03,and it's confirmation is : Milestone confirmation.
and the production order has a parallel sequence,a external processing operation.
but i marked the external processing operation deleted.
then i confirm the last operation,and it's sysstatus is CNF
but the parallel sequence operation is not CNF.
WHY?Dear,
did you delete the operatrion after release or before the release? -
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Hi all,
I need help regarding the parallel routing,
operation description
Sequence 0 1
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2) operation 20 in sequence 0 system proposes for 10 Nos
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If more than one operation has to be carried out simultaneously then one has to go for parallel sequence
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Revert if you have doubts
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SVP
Hope the above is clear
Revert if you have further doubts
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Parallel Processing in Oracle 10g
Dear Oracle Experts,
I would like to use the Parallel Processing feature on My production database running on Unix Box.
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2. Which option for Setting Parallel is good - Using the 'alter table A parallel 4' or passing the parallel hints in the sql statementsIt depends on your application. When setting PARALLEL on a table, all SQL dealing with that table would be considered for parallel execution. So if it is normal for your app to use parallel access to that table, it's OK. If you want to use PX on a limited set of SQL, then hints or session settings are more appropriate.
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4. Query or DML - which one will be perform best with parallel option.Both may take advantages of using PX (with some restrictions to Parallel DML) and both may run slower than non-PX versions.
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Is "starting" a counter the same as "arming" it?
Hi everyone,
I am trying to understand why I get unexpected behavior with my VI and counter output.
I am outputting 3 single,triggered pulses: 2 on a 6602 (1 each on counters 0 and 1), and 1 on GPCTR0 on a 6071E.
The second pulse on the 6602 (on counter 1) is supposed to immediately pulse after the first pulse (on counter 0) is finished pulsing.
GPCTR0 is a pulse used to start my data acquisition, and occurs before the first pulse from the 6602.
All three counters share a common hardware trigger, a repeating 120Hz pulse, synced to some of my other hardware. This train of triggers arrive only after I switch a DIO line (on yet another card, a 6503), and this DIO line is turned on the a sequence frame after the frame in which I set up and "start" my counters (with control.vi set to "start").
Now here's the problem I encounter:
*most* of the time (~4/5 times) I get the output I want from the 6602, 1 pulse right after the other. But every once in a while, I get the pulses ~8 ms apart--that is, counters 0 and 1 are triggering off different trigger pulses in the 120Hz I send to the gates. So one of my counters is somehow missing seeing the start trigger that another counter sees.
How can this be? If all counters are already started, shouldn't the same start-trigger trigger all of the counting operations at once?!
Also problematic, every once in a while, counter 0 is missing the first hardware trigger, but triggers on the second trigger of the 120 Hz trigger pulses. So it seems my problem is that the counters are sometimes just missing seeing the triggers.
Any ideas? I posted my VI. The relevant portions are in big frame3, inner frames 3 and 5. (frame 3 configures and starts all counters. frame 5 turns on my hardware triggers).
thanks in advance for any help!
Attachments:
Neurochip-legacy.vi 698 KBto answer my own question....
i discovered something miswired in my hardware.
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Generate a delayed counter pulse
I am posting this to see if anyone can shed any light on various DAQmx operations with counters. I appear to have found a solution for the project but various counter operations are certainly not well documented and the notes I am posting may help anyone trying to do something similar.
The project is to monitor an analog input channel and when a certain criterion is met generate a pulse with a specified width at a specified delay from the event. It is being done in a LV Real Time system. Initially I tried to start a counter task within a loop, wait until done and stop the task. What I have found is that it takes a long time (of the order of 10-100's of ms) for the start task to return and the wait until done doesn't reliably return at the time the counter pulse is finished being generated. Other people seem to have found the same problem. This is described in the part 1 attachment and the attached vi.
The other way to do it is with a retriggerable counter task and using a digital line on the same card to trigger the counter. Then the way the counter works if there is a single pulse or multiple pulses is different. The way low time and high time are interpreted is odd. This is described in the part 2 attachment with screenshots from Scope captures. I have a proposed solution but I'm not sure if it is the best way to do it.
Any suggestions appreciated.
Attachments:
Generate delayed Counter Pulse problem part 2.doc 108 KB
Generate delayed Counter Pulse Problem part 1.doc 25 KB
Generate Counter Pulse.vi 153 KBAndrew,
If you want to start a counter output task based on an analog input you should use an analog trigger (if your device supports analog triggering). Take a look at the example Cont Acq Sample-Timed Loop-Analog Start.vi (in the example finder - search for "trigger") for how to set up an analog trigger in DAQmx. Also, you can use the Start.Delay property in the DAQmx Trigger property node to specify an amount of time to wait after the Start Trigger is received before generating the first sample
Michael P
National Instruments -
I've got my app prototyped quickly with the default settings in Flex Builder 4. Now I'm going back and adding/modifying features to polish the app off.
For this application I'm using PHP5 as the server side.
The data paging is really cool and simple to call using the default settings. However, I'm running into issues with customizing the data paging feature.
This is the default header of the php function that was created for me:
public function getTblbrowserrecord_paged($startIndex, $numItems){...}
Instead of dumping all data back to the function I want to be able to search on certain fields so I created a new function called:
getTblbrowserrecord_search_paged ($szName, $szIP, $szRule, $szURL, $szDateLow, $szDateHigh, $szCode, $startIndex, $numItems ) {...}
The new function is tested and operates as designed.
I set the input types of the variables and return type (Tblbrowserrecord[]) of the new function then went to enable data paging. The first screen came up and asked me for the key to use which I selected. The next screen came up and asked me for the number of records which I set to 100 then went to select the count operation.
I initially selected the automatically created count() function but it came up with the error " Count operation parameters should match the paged operation parameters list."
So I created another function to match the search function's parameter's list:
public function count_searched($szName, $szIP, $szRule, $szURL, $szDateLow, $szDateHigh, $szCode, $startIndex, $numItems) {...}
But I still ge the error "Count operation parameters should match the paged operation parameters list."
But they DO match. I looked at the default functions that were created by FB4 and noticed that the automatically generated function count() has no parameters and the paged function has the two functions $startIndex and $numItems which are not identical yet they work. I tried removing those two fields from the count function but got the same results.
What am I doing wrong?
Thanks!Nevermind... For some reason my FB4 is not updating correctly. After removing the two control fields at the end of the list AND exiting the app/re-entering everything worked ok. I've been having this issue a lot lately and am thinking that is is a bug of some sort?
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Want to change from bootcamp windows 7 to parallels.
I have recently bought a MBP and installed Windows 7 by using bootcamp. Could someone tell me how I can simply change this to i can use Parallels.Desktop v6? Please give me an indication of how complicated this is.
Install Parallels. Start it up. Select your current Boot Camp installation of Windows as Parallels guest operating syste.
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X Series is here – New Counter Features!
Hey All,
The new X Series Multifunction DAQ devices have been announced – check them out here.
I’m posting here because I think X Series has several new counter features that many on this forum have been looking for. The user manual
will have all of these details and more with timing diagrams but I
thought I’d summarize a few of the sexier features and open it up for
comments/feedback.
First off – what stayed the same between
M Series/TIO counters and X series counters? The pinouts between M and
X series are the same so the PFI lines and default counter pinouts are
the same. The DAQmx programming is the same (you’ll need DAQmx 9.0, it
should be up this afternoon) and all the functionality that was
supported by M Series is supported by X Series, though a few behaviors
may have changed. Counters are still 32 bit.
Now on to
the fun stuff – the big one that I tend to overlook: X Series has 4
counters per board! They all have the same features and Freq Out is
still there too (with an additional 20MHz timebase).
Timebases:
X Series devices have 100MHz, 20MHz and 100kHz timebases. Note the
difference between 80MHz on M series and 100MHz on X series. DAQmx will
take care of the difference for you, unless you were programming in
terms of ticks and hardcoded in numbers based off of a 80MHz clock.
Counter
FIFOs: X Series has a 127 sample FIFO per counter. When combined with
PCIe/PXIe, our benchmarked buffered counter rates went from ~350k on M series
(with a 2 sample FIFO) with a single counter to 10MHz on all four
counters (160MB/s streaming rate). The FIFO also allows us to implement…
Buffered Counter Output: Probably my favorite new feature. You can
now use a multi point write on counters and write out a buffer of pulse
values. There are two timing modes for this: implicit and sample
clocked. With implicit timing, every idle/active pair you write is
generated as a pulse. You can vary the idle/active time for every pulse
in your pulse train. Check out the "Gen Dig Pulse
Train-Buff-Implicit-Cont.vi" shipping example. With sample clock
timing, the idle/active time are updated every time a sample clock is
received. Check out the "Gen Dig Pulse Train-Buff-Ext Clk-Cont.vi"
shipping example. These modes give you much more control over your
waveform – now everything about it can be hardware timed. Also, I’ve
benchmarked the output rates at 10MHz on all four counters at the same
time.
Finite pulse train with one counter: Each X Series
counter has an Embedded counter paired with it. The embedded counter
isn’t directly programmable, but it does allow you to do counter
operations on one counter that used to take two. A finite pulse train
used to take two counters – one to generate the pulse train and one to
gate it. Now a counter generates the pulse train, and its embedded
counter counts the TCs and disables the counter when it reaches the
number of pulses to generate.
More sample clocked
measurement modes: Edge counting and encoder measurements always
supported sample clocks, all other counter measurements were implicitly
(timed by the measurement waveform) timed. With the addition of the
sample clock terminal to the counters now all counter measurements
(except for semi-period) support sample clock timing. You can now get
the pulse width of the pulse just before the sample clock rather than
getting all the pulse widths and figuring out where they happened in
time. Why not semi period? We added a new “pulse” measurement instead
that returns a sample that contains the high and low time (or high and
low ticks, or frequency and duty cycle) so for each sample clock edge
you get a full pulse spec. Semi period still supports the same
measurements it used to, just not sample clocked. Speaking of sample
clocked…
Sample clocked frequency/period measurement
with averaging: X Series still supports the three frequency modes: Low
frequency 1 counter, 2 counter High Frequency and 2 counter Large
Range. In addition it supports sample clocked averaging. This is
essentially a method that is high accuracy method based on the sample
clock rate. With the same measurement time it has the same accuracy as
the Large range mode but it doesn’t take two counters. Note, counters
do not have their own internal sample clock so you have to provide them
with an external signal.
Hope this helps,
Andrew S
National Instruments
Multifunction DAQ Product Support Engineer
Getting Started with NI-DAQmx
Measurement FundamentalsHi guys,
I drew up a schematic of one of the applications I need to get running in our lab. To recap:
1) We have several piezo controllers for nanopositioning of samples under a microscope, some of them driven by a digital circuit that handles coordinate programming and trigger line programming (for syncing detectors to the piezo motion), other controllers are analog and need to be driven by voltages.
2) We would like to emulate the behavior of the digital controller using the analog HW (we have much more analog controllers than digital ones).
3) The basic implementation is like this (see also slide one in the attached pdf file) and runs perfectly:
a. A global pulsetrain ticks with a certain frequency
b. At each tick a voltage is written on an AO line and this tick is also sent to an RTSI line to sync multiple detectors
4) To fully emulate the digital controller we also need to implement 4 trigger lines that exist on the digital controller. These trigger lines allow for fully programmable pulsetrain output that is in sync with the movement of the piezo. Slide two in the attached pdf illustrates what is needed. These trigger lines allow for much more intricate syncing of our detectors (only measure during certain parts of the motion instead of all the time).
After a lot of thinking and experimenting with the existing M series boards back here I came to the conclusion that the desired behavior is not possible with an M series board since they only allow for the output of “simple” pulsetrains with a given frequency.
Looking at this webpage (http://zone.ni.com/devzone/cda/tut/p/id/9384#toc3) however, I think that the X series board would offer exactly what we need since it allows for buffered counter output that enables definition of very complex pulstrain “shapes”.
Looking at the schemes I provided, could someone confirm that the X-series covers our needs? If this is the case, we would be interested in purchasing these kinds of boards.
Cheers,
Kris Janssen
Attachments:
Raman Imaging Timing Implementation.pdf 76 KB
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