PCI-6602 Triggered event counting DAQmx

Hi
I'd like to use simple event counting using PCI-6602 (DAQmx) with an internally generated trigger pulse.
But I don't know how to figure out the error message when I use DAQmx Start Trigger.vi
Thanks
Kyu Young
Attachments:
EventCountingTrig.vi ‏21 KB

I'm sorry. I've solved it.

Similar Messages

Resistance measurement using PCI-6602

Hello,
I would like to measure the resistance between 2 points using my PCI-6602 counter/timer card while using LabVIEW. The resistance values to be measured will vary between 10 ohms and 1000 ohms approximately.
I found three examples in LabVIEW example finder for measuring resistance but am not sure which one to use. Moreover, which pins of the PCI-6602 would be used for measuring the resistance?
Please advise me how I could use this PCI-6602 card for measuring resistance values and what the pin configuration would be.
Thank you,
Viktoriya.

As you have written, the PCI-6602 is a counter/timer board. It has no analog input and is not suited for analog measurements !

Count digital events on a Counter with pci-6602 with callback on CVI

Hi,
I'm using a PCI-6602 card with CVI 8.5 and I need to trig on event.
On every pulse I received, I need to do some actions like increasing a counter, send a message on Rs232 etc.. I don't want to do any loop checking that the counter value has changed. I would like to use a callback to execute this code only on the edge or counter value event.
My problem is that I don't know which function can do this. Is there any way to get an event on a pci-6602?
Thanks
James
Solved!
Go to Solution.

Hello.
It's completely possible to create a callback that will allow you to do what you want when a edge will occur on an external signal you define.
To do this, you can for exemple create a counting edges task that will use one of the 6602 counters,and the set your external signal to be the source of your sample clock.You'll then be able to register a callback with the function DAQmxRegisterSignalEvent, and your callback will be called each time an edge will occur on your specified sample clock source.
Here's 2 links that explain the events in DAQmx and how to handle them in CVI. The example ReadDigChan-ChangeDetectionEvent.pr that ships with DAQmx examples (Hardware Input and Output<<DAQmx<<Digital measurements) can be very useful to understand how to do. This example creates a signal event callback to detect change detection for digital inputs.
Regards.

Error -200141 when doing buffered events with DAQmx and PCI-6602

When doing buffered events with DAQmx and PCI-6602 I get error 200141 - Data was overwritten before it could be read by the system.
This error is generated ONLY with random inputs >200/sec.
My setup is :
DAQmxCreateCIVCountEdges(taskhandle,"Dev1/ctr3"....
DAQmxCG+FGSampClkTiming(taskhandle,"/Dev1/FPI35",...
DAQmxSetCICountEgdesChan(taskhandlem,"", "/Dev1/80MHZTimeBase")
DAQmxSetChanAttribute(taskhandlw,",",DAQmx_CI_DataXferMech,DAQmx_Val_DMA,0);
Can somebody help ?

i'm getting the same Error-200141, while reading semiperiods. (Meas_Buffered semiperiod continous)
while loop ex.rate seems to be pulsewidth*no.Samples to read. in my case PW=60ms
Input buffer size measured with Property node= 10000
why this error happens?? i cant use any mode other than implicit timing for semi-period measurement right??
more info: all the ai channels are used ~ 16 differencial.
i found one solution which is _ reinitializing the whole task if an error occur. is this the right way??
Kudos always welcome for helpful posts
Attachments:
Counter_1_Meas Buffered Semi-Period-Continuous_main_lv09.vi ‏34 KB
SemiPeriod_Reconnect Counter on Error.vi ‏35 KB

Triggering the reading of counter totals (PCI 6602)

Hi,
thanks for reading these lines,
for a special application I need to read the totals of multiple counters
simoltanouesly. The inputs of the counters are connected to quadrature encoders.
Is there a way to reroute the gate to another input pin?
Thanks for taking the time to support me.
live long and prosper
Michael

Dear Jochen,
(1) Principally, I'd like to use PCI-6602 to be a motion encoder also be a counter (Is it possible? Due to the manual, it is possible). I expect to have all information, such as position, time, velocity, etc. from that motion encoder (or at least the position and time). It is also expected of using PCI-6602 to do all measurements that I mentioned before . My meaning is, after having a signal from the counter, that 'count' will be converted to desire units under other programs. So, in this case, PCI-6602 is only used to get the 'count'.
Simplified, the voltage command will send to the system (linear motor) through PCI-6052E (-10V to 10V). The actual position or other actual information will be catched (read) by using PCI-6602 (as a motion encoder, also as a counter). Then, this actual position will be used as a feedback, that will be compared to desired position.
Is that also possible to use PCI-6602 be a motion controller + a counter + a frequency measurement in a same time parallely?
I don't decide yet (I don't know) which acquisition rate will be needed/required, higher is better.
(2) I'd like to apply an adaptive robust controller (yes, it is a closed loop system) under matlab with their feature called Real-Time-Workshop instead of using LV.
(3) Power drive for the linear system will be driven by AC servo drive.
Thanks for your help before,
Warmly regards,
hendro

PCI 6602:How can I use the digital lines of the board and in the same time to generate pulse train using a counter?

Hello!
My problem appeared when I tried to update my code from Traditional NI-DAQ Legacy to DAQmx.
I am using 2 counters (counter 5 and counter 7) from PCI-6602, to generate pulse train, and also the Digital I/O lines of the port 0 (the lines form 0 to 7). What I do in my application is that I am starting to generate the pulse train on the output of the 2 counters, and after that I am playing with the state of the digital lines.
In traditional there was no problem using the counters and the digital lines in the same time, everything was going perfectly, but in DAQmx this is not possible.
What happens: I start to generate pulse train on the output of the counters, no errors encountered, but when I try to modify the state of one line of the digital port the generation of the pulse train is stopped. This is happening when I start the task associated to the digital port.
My question is: it is possible to create a channel on the digital lines without altered the channels created for the counters?
Another thing what I manage to see using the "Measurement & Automation Explorer" and Test panels for PCI-6602, basically is the same thing, I generate pulse train on the output of the counter 7 and try to start a task on the digital line, but I get one error :
"Error -200022 occurred at Test Panel
Possible Reason(s):
Measurements: Resource requested by this task has already been reserved by a different task.
Device: Dev4
Terminal: PFI8"
Instead if I use the counter 0 or counter 1 to generate pulse train I don't encounter the same problem.
Which resources are used by the counters 2 to 7 from the PCI-6602 board and the counters 0 and 1 do not use?
Thank in advance for any replies!
Ciprian
Solved!
Go to Solution.

Hello Jordan, thank you for your reply.
I am sorry but I can not see or run your example, I don't use LabView, I use Visual C++ for developing.
Here is the code for generating the pulse train:
GeneratePulseTrain(unsigned long ulCount1, unsigned long ulCount2)
    short nStatus = 0;
    nStatus = DAQmxCreateTask("",&m_taskHandle);
    nStatus = DAQmxCreateCOPulseChanTicks (m_taskHandle, "Dev4/count5", "", NULL, DAQmx_Val_Low, 0.0, ulCount1,ulCount2);
    if( bTriggerMode == true) // if hardware trigger is enabled
       nStatus = DAQmxSetTrigAttribute (m_taskHandle, DAQmx_ArmStartTrig_Type, DAQmx_Val_DigEdge);
       nStatus = DAQmxSetTrigAttribute (m_taskHandle, DAQmx_DigEdge_ArmStartTrig_Edge, DAQmx_Val_Rising);
       nStatus = DAQmxSetTrigAttribute (m_taskHandle, DAQmx_DigEdge_ArmStartTrig_Src,"Dev4/PFI17" );
   //set the internal timebase
   nStatus = DAQmxSetCOCtrTimebaseSrc(m_taskHandle,"Dev4/count5","20MHzTimeBase" );
   nStatus = DAQmxStartTask(m_taskHandle);
    return nStatus;
And the code where I try to set the digital line:
SetChannelState(short nState)
    short nStatus = 0;
    uInt8 wrtBuf0[1]={0};
    nStatus = DAQmxCreateTask("",&m_taskHandle);
    // Configure line as output
    nStatus = DAQmxCreateDOChan (m_taskHandle, "Dev4/port0/line0", "", DAQmx_Val_ChanPerLine);
nStatus = DAQmxStartTask(m_taskHandle);
    wrtBuf0[0] = nState;
    nStatus =DAQmxWriteDigitalLines (m_taskHandle, 1, 0, 0, DAQmx_Val_GroupByScanNumber , wrtBuf0, NULL, NULL);
    nStatus = DAQmxWaitUntilTaskDone(m_taskHandle,10);
    nStatus = DAQmxStopTask(m_taskHandle);
    nStatus = DAQmxClearTask(m_taskHandle);
    m_taskHandle = 0;
    return nStatus;

How to generate a pulse on x number of events PCI-6602

I am running LabVIEW 5.1 full development with a PCI-6602 counter board.
I would like to generate an output pulse after counting x number of input pulses. I would also like to reset the counter with an external signal.
My application is I am trying to generate a second index pulse for an encoder.
I would like to count the pulses from encoder phase A and generate an output pulse on x number of counts. Then I would like to reset the counter using the encoder’s index pulse. This way I can change the phase of the “generated” index pulse with respect to the “real” index pulse by x number of counts (degrees) and maintain that regardless of encoder rpm.
Thanks
Brian

Brian,
There actually is a way to do what you want, but it gets a little complicated. I don't have LV on this machine so I'll have to just describe the idea. First a summary: the counter will repeatedly countdown to 0. Each time it reaches 0, it will generate a brief pulse which will in turn hw-reset the counter value to N. Then it will countdown to 0 again, etc. The same brief pulse could also be wired to a different encoder-measuring counter to create a "delayed" reset to 0 (or some other #).
1. Configure your counter for "position measurement" instead of "simple event counting". Set the encoder type to, um, I forget the name -- something like "two pulse encoder." It's the setting that will increment with every SOURCE edge and decrement with every AUX edge. Wire your encoder channel A to the counter's default AUX input (in position encoder mode, you must use the default input pins). Hard wire from the default SOURCE input to GND. Now every encoder edge will decrement the count, and nothing wlil ever increment it.
2. Configure the counter to use z-indexing. Set the z-index reload value to be N-1, where N is the # of encoder counts by which to delay the encoder's real z-index pulse. Set the z-index reload phase appropriately, probably to A low B low. Wire the real z-index pulse to the counter's GATE input.
3. Configure the counter to "pulse on terminal count" -- you do this using 'Counter Set Attribute.vi'. So N encoder edges after the real z-index pulse, you'll generate a pseudo-z-index with this counter.
4. You can wire this pseudo-z-index to the GATE input of the encoder-measuring counter. Now the encoder's z-index pulse is delayed by an amount you can program.
5. Note: this method requires the motion to be uni-directional.
Good luck!
-Kevin P.

Frequency divide by N doesn't work on Counter-Timer PCI-6602

Hello everybody,
I tried to do something basic ( ?) with this Counter-Timer 6602 Board, and it doesn’t work.
So I hope some people with more experience than me could understand what happens here.
1) What I need:
I need to generate 4 synchonised clocks, whose periods will be multiple of 1 ms.
2) What I have:
LabVIEW 7.0 and a PCI-6602 Counter-Timer Board in a DELL PC running under XP pro.
The PCI-6602 Counter-Timer Board has 8 counter timers named CTR 0, CTR 1, ... CTR7.
3) What I have already done, and that worked:
- Generate a 1 kHz “Master Clock” signal from CTR 4, configured by “Continuous Pulse Generator Config.vi” (found in “Data Acquisition, Counters...).
- configure CTR 0 and CTR 1 to work as frequency dividers, by use of “Down Counter or Divider Config.vi”.
- Apply the output signal of CTR 4 (OUT ) to the SOURCE inputs of CTR 0 and CTR 1 by means of physical wiring in the SCB-68 connection box.
When I do this, I get two nice secondary clock signals on my oscilloscope screen, ( with periods = 3 ms, or 5 ms or whatever multiples of 1 ms I choose) from CTR 0 and CTR 1 outputs , very clean and perfectly in phase with the 1 kHz Master Clock.
So far, so good...
But I still need 2 more secondary clocks...
One would say: “No problem, do the same trick with two other counters...” Well, not so simple, it seems...
4) What I tried to do, and that didn’t work:
When I try to do the same frequency division with any of the remaining counters, (CTR2 to CTR7), the program stops and I get an error “ –10020 : Time base not valid “.
I can’t figure out what happens here: I thought any counter could be configured to work as a frequency divider, but it seems not to be so, and I am stuck here.
Has anyone an idea about how to fix this type of problem?
Attached file: hor_div02New.vi
Attachments:
hor_div02New.vi ‏123 KB

karolik,
I'm just adding a followup in English. As Marc L. mentioned, the particular vi named "Down Counter or Divider Config" isn't compatible with the 6602. While the 6602 does have the ability to generate 4 synchronized clocks, a different syntax is needed. Here's how I'd do it:
Traditional NI-DAQ
1. Configure a continuous pulsetrain on CTR 4. Route its output to, say, RTSI 4. Don't start it yet.
2. Configure CTR 0,1,2,3 for continuous pulsetrains using RTSI 4 as their "timebase source." Start them.
3. Start the CTR 4 pulsetrain.
4. Now CTR's 0-3 should generate separate clocks with synchronized phasing.
DAQmx
1. Configure a continuous pulsetrain on CTR 4. Don't start it yet.
2. Configure CTR 0,1,2,3 for continuous pulsetrains using "Ticks" for units. Use a DAQmx property node (probably Channel property node, but am not 100% sure and don't have a LV PC handy to check) to specify that the "ctr4 internal output" should be used as the timebase. Start them.
3. Start the CTR 4 pulsetrain.
4. Now CTR's 0-3 should generate separate clocks with synchronized phasing.
-Kevin P.

I'm trying to use DAQmx for simple event counting using PFI8

Hi,
I am presently using Traditional DAQ (Legacy) drivers in my software, however I'm in the process of switching over to DAQmx drivers. Our systems use an E Series DAQ card: PCI-MIO-16XE-10.
I use PFI8 along with Counter 0 to do simple event counting. The signal is connected to PFI8 and as it changes, my counter output either increase or decreases in value. The attached vi shows how I've done it in the past using the Legacy drivers (top portion of the vi) and how I'm attempting to do it using the DAQmx drivers. I've combined both versions on the single vi just for illustration purposes - when I do my testing they are on separate vi's.
I'd appreciate it if anyone could help me to figure out why my DAQmx version isn't working properly. Thank you very much!
Steve
Attachments:
PFI8_DAQ_Comparison.vi ‏36 KB

Hey Steve,
The DAQmx driver installs several examples into LabVIEW that
demonstrate how to implement various event counting applications. I
recommend you look over these and see if any of them accomplish what
you're trying to do. They're usually very simple to understand and
well documented, but I'd be happy to help you out with any of them if
you had a particular question.
You can find them in the Example Finder (Help >> Find Examples)
in LabVIEW. Drill down to the following location in the directories:
Hardware Input and Output >> DAQmx >> Counter Measurements >> Count Digital Events
You'll see a number of examples, but I recommend starting with 'Count Digital Events.vi'
Since PFI8 corresponds to CTR0 SRC, make sure you set it to use counter 0. This should work correctly.
Elijah Kerry
Senior Product Manager, LabVIEW
Follow my Software Engineering for LabVIEW Blog

How to generate an Interupt for DMA transfer from Counter on NI-PCI-6602

dear guys:
      how to generate an Interupt for DMA transfer from Counter on NI-PCI-6602,and I have set the DMA and DMA_INT, and also the global interrupt register.
but there is no Interupt generated in the Interupt callback function.And when I have set the DMA_INT and global interrupt register ,and then read the relevant register,the relevant bit is also 0.
     I suspect there is an Interupt register contral, like the MITE, you must write the value to 0xc4 for opening .
     there is some codes In my enclosure .What can I do?
Attachments:
TEST.C ‏21 KB

dear Steven_T:
        the registers are In my enclosure ,if you have some ideas,please reply me first time.thank you !
Attachments:
PCI6602.pdf ‏818 KB

Counter using PCI-6602 for multi output

Hi guys,
currently I tried to control a linearmotor using PCI-6052E and PCI-6602.
The questions is, how to use PCI-6602 to be a counter which will be converted to several output (multioutput):
(1) converted to position >> 1count = ...[mm] --> position measurement
(2) converted to voltage >> 1count = ...[mV] or [V] --> voltage measurement
(3) converted to current >> 1count = ...[mA] or [A] --> current measurement
(4) converted to velocity >> 1count = ...[mm/s] --> velocity measurement
(5) converted to acceleration >> 1count = ...[mm/s^2] --> acceleration measurement
(6) converted to force >> 1count = ...[N] or [kg.mm/s^2] --> force/load measurement
(7) converted to frequency >> 1count=...[Hz] --> frequency measurement
(i) Please assist me how to connect the driver's encoder (Ch. A A/ B B/ Z Z/) with PCI-6602, so I can get all informations above (7 measurements). What/which port of PCI-6602 connect to where from the driver.
(ii) Please assist me how to connect the feedback signal to the PC. What/which port of PCI-6602 connect to PC.
(iii) How to test those 7 measurements above using Measuremant and Automation Explorer (MAX) ver.4.4.1?
Thank you for your kindly help and assistance.
Best wishes,
hendro

Dear Jochen,
(1) Principally, I'd like to use PCI-6602 to be a motion encoder also be a counter (Is it possible? Due to the manual, it is possible). I expect to have all information, such as position, time, velocity, etc. from that motion encoder (or at least the position and time). It is also expected of using PCI-6602 to do all measurements that I mentioned before . My meaning is, after having a signal from the counter, that 'count' will be converted to desire units under other programs. So, in this case, PCI-6602 is only used to get the 'count'.
Simplified, the voltage command will send to the system (linear motor) through PCI-6052E (-10V to 10V). The actual position or other actual information will be catched (read) by using PCI-6602 (as a motion encoder, also as a counter). Then, this actual position will be used as a feedback, that will be compared to desired position.
Is that also possible to use PCI-6602 be a motion controller + a counter + a frequency measurement in a same time parallely?
I don't decide yet (I don't know) which acquisition rate will be needed/required, higher is better.
(2) I'd like to apply an adaptive robust controller (yes, it is a closed loop system) under matlab with their feature called Real-Time-Workshop instead of using LV.
(3) Power drive for the linear system will be driven by AC servo drive.
Thanks for your help before,
Warmly regards,
hendro

DMA transfer rate for PCI-6602 counter/timer

I'm strongly interested in raising the DMA transfer rate between the PCI-6602 counter and computer. At the moment, I've got a Pen-4 2.4GHz operating under Win98. I have to move an 80 Megaword array at an ~5 MHz speed. So far, I've been able to reach just 2 MHz. Would it be possible? What is the battleneck here - the soft- or hardware?

Hello,
I think the bottleneck you are seeing here is a limitation of the dma transfer capabilities that is dependant on the bus of your PC and not your 6602 card. Here is a link of a knowledgebase that you could try to use to see if that would improve your transfer rates. I still doubt you will be able to achieve approximately 5MHz.
http://ae.natinst.com/operations/ae/public.nsf/fca7838c4500dc10862567a100753500/1b64310fae9007c086256a1d006d9bbf?OpenDocument
Regards,
Steven B.

PCI-6602: Stop counting after roll over

Hi,
I'm programming a PCI 6602 Board and want to stop a counter after
it had a roll over. This option isn't available in the NIDAQ 6.7 I think!
If you know, how I could manage it, please reply.
thank you
Steve Dreger

Error -10920 is normally caused by speed limitations of your computer. Normally changing from debug to release mode will help fix this. Here are several other KBs that explain this error and how to fix it.
http://digital.ni.com/public.nsf/websearch/8FB9091CB9BB452B8525642000554799?OpenDocument
http://digital.ni.com/public.nsf/websearch/5D7774A864C1EE1786256713005D848D?OpenDocument
http://digital.ni.com/public.nsf/websearch/5d7774a864c1ee1786256713005d848d?OpenDocument
http://digital.ni.com/public.nsf/websearch/5d7774a864c1ee1786256713005d848d?OpenDocument
http://digital.ni.com/public.nsf/websearch/1B64310FAE9007C086256A1D006D9BBF?OpenDocument
If running the ResetDevice command does not work. I suggest opening MAX up and right click on Tradio
nal NI-DAQ Devices, and then click on Reset driver.
I hope this helps out.
Joshua

Gated event counting on 6602

I am trying to use gated event counting or single pulse width measurement techniques to count TTL pulses on two counters during an external gate pulse. The problem is that if zero TTL pulses (a possible condition) go to both counters during the gate, the "armed" attribute does not seem to change from "yes" to "no", allowing the vi to kick out of a while loop and read the value that the counter stored.
Is there a way of setting up the counters so that
1) both counters only collect counts during an external gate
2) zero counts are allowed
3) the counters change state from "armed" to "not armed" at the end of the gate pulse regardless of whether there were TTL pulses on the source channel during the gate?
Thanks,
-Martin

Based on your description of the application, I assume that you are using traditional DAQ. If you have an application where you sometimes expect to have zero source pulses between gates, you should enable synchronous counting (ND_COUNTING_SYNCHRONOUS) (referred to as "duplicate count prevention" in DAQmx). Many of the examples in traditional daq have this as an option that can be enabled on the front panel.
I hope this helps!
gus....

Buffered event counting, VB6, DAQmx

I have an encoder that I would like to count the pulses per revolution on.
I can do this in Traditional DAQ by setting the Counter Source and Gate. Source being the encoder pulse train, and the Gate being the index on the encoder.
How would I do this in DAQmx? Every example I have seen is for event counting, but nothing to actually give you a PPR.
Source is channel A of encoder.
Gate is channel Z of encoder.
Any source code tidbits will be very much appreciated.
Thanks for your help.

Big Guy,
In DAQmx, the source and gate pins of each counter have default values. You can find which pins you need to use by opening up Measurement & Automation Explorer (MAX) and then navigating to Devices and Interfaces>>NI-DAQmx Devices>>(Your Device) and then right-clicking and choosing Device Pinouts. Unless there is an absolute need to use another pin, I'd recommend using the default pins shown below.
Which DAQ card are you using?
Default NI-DAQmx Counter Terminals
Counter/Timer Signal
Default Pin Number
Signal Name
CTR 0 SRC
37
PFI 8
CTR 0 GATE
3
PFI 9
CTR 0 AUX
45
PFI 10
CTR 0 OUT
2
PFI 12
CTR 0 A
37
PFI 8
CTR 0 Z
3
PFI 9
CTR 0 B
45
PFI 10
CTR 1 SRC
42
PFI 3
CTR 1 GATE
41
PFI 4
CTR 1 AUX
46
PFI 11
CTR 1 OUT
40
PFI 13
CTR 1 A
42
PFI 3
CTR 1 Z
41
PFI 4
CTR 1 B
46
PFI 11
Josh W.
Certified TestStand Architect
Formerly blue

PCI-6602 Triggered event counting DAQmx

Similar Messages

Maybe you are looking for