Health signals of PXI?

hai
Am developing a DAQ system in which 2 PXI system will be running in hot redundant mode. I need to develop an application which monitors the health of the PXI and in case of abnormal behaviour need to swithc the PXI and start a app in the redundant PXI. I wanted to know which are cpu signal i can use to monitor the health of the PXI,and how do i check the signal?
Thanx for any answer
Arun

Hello,
The Windows Desktop Perfmon and Diagnostic tools forum is to discuss performance monitor (perfmon), resource monitor (resmon), and task manager, focusing on HOW-TO, Errors/Problems, and usage scenarios.
As the question is off topic here, I am moving it to the Windows Server General Forum forum.
Karl
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Program to write signals from PXI 5105 using labview 2011

Hello
I am new in using labview. I need help in writing program to continuously record the signals form PXI 5105 using LabVIEW 2011. I prepared a program using help examples. It is recording the signal using pxi 5105 into the file after trigger. I tested the code using waveform generator with -100mV to 400mV, 1 kHz, sine wave. I have also attached the waveform of signal from the excel file recorded by the program. I have following queries
(i) Is the program correct to continuously record the triggered signals. Have I used the while loop correctly?
(ii) why some part in waveform is missing.
(iii) What should be the value of millisecond multiple ( I used zero)
I want to use above program for strain gauge signal measurement. Where I have to record the data at 20Ms/sec sample rate for 1 milli second after trigger.
thanks
Attachments:
Signal recording programme.vi ‏85 KB
recorded_signal.png ‏38 KB

Hi,
Sorry but I've only got LabVIEW 2010 so I can't open your file. If you can post a 2010 version I can take a look.
vinod_p wrote:
(iii) What should be the value of millisecond multiple ( I used zero)
If you are talking about the "Wait until Next ms Multiple" function then "Wiring a value of 0 to the milliseconds multiple input forces the current thread to yield control of the CPU." (from the context help for the function - press <ctrl>+h). Is this the behaviour you want?
Normally the ms multiple function is used to synchronise loops as it waits until the next multiple (be it 10ms or 10s) before continuing the loop.
-CC
"If anyone needs me, I'll be in the Angry Dome!"

How to measure different signals with PXI-2501

Hello everybody,
i have a an understanding problem.
I have a PXI-2501 switch and i want to measuere signals with the pxi-4071, so far so good.
I did some voltage- measurements and everything worked fine. Then i disconnected the power source and measured the temperature with a PT1000 in four-wire-mode ... also worked fine.
But i want to measure voltage and temperature, in the same VI, so i connected the voltage signal on CH0 and the PT1000 at CH5 (in four wire mode), and now i get problems. The temperature is fluctating. There are a few measurements that seems OK, and then i see some that are far away from the truth.
The VI consists of a state machine, the measurements are done in different states, of course with the correct scan list for each measurement.
Any suggestions? Am I doing something completely wrong?
Thanks
(and excuse for my english )

Hi Roman,
id I understand you right:
The temperature measurement works fine, if the sensor is directly connected to the 4071, but if connected via the 2501 you see the big deviations?
Have you measured the the resistance of the Switch-Matrix yet?
kind regards
Heinz

Analog signal from PXI

Hi everybody,
I have a problem: I cannot acquire 6 analog signals with a PXIe 8135 with 4MS/s. I use two boards with 4 MS/s, 16 bits and 8 Analog Inputs. I use a subVI of SAMPLE CLOCK for configuration with this parameters, Continuous SIGNAL, SAMPLE RATE = 4MS/s ( see attachment ). With one signal is ok, but with 2 signals, i have an overload Memory Message.
Where is the problem in the VI?
Thanks for your help.
Attachments:
acq_and_graph.zip ‏165 KB
acquire&loggdata.png ‏230 KB

Quickly looking through your code now, try removing the "Number of Samples analog". Since you are using Continuous Samples, you are just limiting the buffer and also limiting how many samples you can read at a time.
But you might want to think about using Finite Samples. You know how long you want to log for and you know your sample rate. So why not just do the simple math and tell DAQmx to get that many samples? You can use the DAQmx Task Done? VI to see if it is done. That would be much simpler than checking the time that has elapsed.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Aquisition of a voltage Signal with PXI 6713

Hi.
I want to make voltage aquisition with a PXI 6713 card. I take the Channels ai16 to ai33. The voltage at the clamp is 3.886VDC ( measured with a DMM ). When i measure the voltage and calculate it into a current ( see my applikation atteched ) the result is something between -10 and -24mA?!?!?
Are the settinges in the DAQmx Express-VI "analog voltage aquire" wrong or could it be another Problem?
My settings are:
RSE
voltage measuring from 0 to +8VDC
N Samples
I hope of yous Answer.
Thanks
Attachments:
analog_voltage_aquisition.jpg ‏33 KB

Is it a trick question??
First of all, Looks like you mentioned the card wrong PXI 6713 is an AO card, without any AI channels
Which card are you using??
Are you connecting a 390 ohm Resistance on your connector block to convert current signal to Voltage equivalent?? ( Sounds like you are not )
Are you measuring the Voltage correctly in the first place??
if you are not, check if the signal is connected correctly for RSE mode
Hope this Helps
Regards
Dev
Message Edited by devchander on 07-28-2006 07:35 AM

Generate PXI Trigger Signals with PXI-6115

Hello,
I have a question.
I have a PXI-6115 and some other card in my mainframe.
These other cards nee 10 Mhz pulses on line PXI-Star1 and 2.5 MHz on PXI_trg7.
So I thought to apply (somewhere on my PXI 6115 card) 10 MHz, divide the 10 MHz with a counter to 4 and route all this things to the backplane.
But I don't understand how to do this.
There are no good examples.
And as far as I know the PXI-6115 isn't yet supported by DAQ-MX.
Can anybody give me some good advises or tips, white paper or so to make me solve my problem ???
Thanks Ruediger

I don't have time to write any example snippets right now, but I'll try to provide you the general idea and hopefully you can take it from there.
First, it's not clear whether you want to generate the 10 MHz from the 6115 and send it to other devices in the system or accept the 10 MHz externally and route it to the rest of the system. If you're bringing in the signal externally, I would simply using the DAQmx Connect Terminals VI to route the signal from a PFI line on the front connector of the board to one of the PXI trigger bus lines in the backplane. Check out the routing table in MAX to see what routes are possible. To perform this route, the driver will have to route through Counter 0 so you won't be able to use Counter 0 for anything else.
If you want to generate 10 MHz from the 6115, I would create a continuous pulse train task on Counter 0 using the CO Pulse Ticks version of the Create Channel VI with a value of 2 for both the high ticks and low ticks input. However, to achieve 10 MHz clock on a PXI trigger line, you'll have to perform a couple of modifications that typically aren't done with counter tasks. First, you'll need to use the DAQmx Export Signal Property Node to route the Counter Output Event to the desired PXI trigger line. You can find this property by navigating the following menu hierarchy Events->Counter Output Event->Output Terminal. By default, the driver routes this event to the Ctr0Output pin on the front connector of the board. Using this property will override this behavior and route the output of the counter to a PXI trigger line instead. Second, you will need to change the output behavior of the Counter Output Event from toggle to pulse. This can be through the Events->Counter Output Event->Output Behavior property. Normally, when generating pulse trains, the high ticks and low ticks parameters from the Create Channel VI determine the frequency and duty cycle of the pulse train. When the high ticks count expires, the output of the counter toggles. The low ticks value is then loaded into the counter, and the counter output toggles again when the low ticks value expires. This process repeats to produce a pulse train of the desired frequency and duty cycle. Since the counter uses a 20 MHz timebase and has a minimum low ticks and high ticks value of 2, you can only produce at maximum a 5 MHz pulse train using the toggle behavior. However, by changing the output behavior from toggle to pulse, the counter output will issue a short pulse each time the high ticks and low ticks counts expire yielding a 10 MHz clock signal.
Now that you have the 10 MHz signal taken care of, you need to generate a 2.5 MHz signal from it. My guess is that since you have a 6115, you already have plans for the AI engine so I'll describe a route that uses AO instead. First, create an AO task to perform continous waveform generation. Use the DAQmx Channel Property Node and set the Use Only Onboard Memory property to true. Setting this to true will cause the driver to download the waveform once upon starting the task and replay the waveform from the onboard FIFO. Since you're only using this task to generate a clock, you don't really care about the data and this will prevent unneccessary traffic across the PCI bus. Next, use the DAQmx Timing Property Node to set the Sample Clock->Timebase->Source to the PXI Trigger line that you're generating the 10 MHz clock on, and set the Sample Clock->Timebase Divisor to 4 (10 MHz / 4 should give you a 2.5 MHz sample clock). Last, use the DAQmx Export Signal Property Node to set the Clocks->Sample Clock->Output Terminal to the PXI Trigger Line you want to generate the 2.5 MHz signal on.
It requires some creative programming, but you should now have a 10 MHz and 2.5 MHz signal routed onto two different PXI Trigger lines. I know this solution is a bit involved so if you have any further questions be sure to post back.

Plot time-domain signal on PXI-5660

Hi,
I want to plot the time-domain signal on the exactly on the way it leaves the signal generator, frequency, amplitude etc... Im using PXI-5660. Is it possible?
Thanks,
Valerio Nobre

Hi:
PXI-5660 allows you to acquire either IQ (time-domain) data or FFT data. If you acquire IQ data, you can plot I-data as a function of time, Q-data as a function of time, or I-data vs Q-data. If you plot the FFT data, you will see power level (you can configure the units using SMT Unit Conversion VI) as a function of frequency.

Low Amplitude Signal on PXI-4461

I am curently using two PXI's to output an analog signal through LabVIEW 2009 to an oscilloscope:
PXI-4461 is running the attachment (labeled appropriately) below. It also produces the green line on the graph. It appears correct on the oscilloscope.
PXI-5412 is running the other attachment (labeled appropriately) below. It produces the yellow line on the graph. This amplitude is measured correctly (or so it shows in the margin of the picture), however it gives me a "Low Signal Amplitude" warning and displays the wave much smaller than the "correct" version from the 4461.
*Note: I suppose it is possible that the PXI-4461 (green) is wrong and the PXI-5412 (yellow) is right, but since the PXI-5412 (yellow) produces the error, i am lead to believe that it is the problem.
I could use some help figuring out what might be causing this inconsistency and how might I go about remedying this issue.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If someone helped you out, please select their post as the solution and/or give them Kudos!
Solved!
Go to Solution.
Attachments:
PXI-4461 Function Generator.vi ‏87 KB
PXI-5412 Function Generator.vi ‏23 KB

This has nothing to do with LabVIEW. It is all oscilloscope related. The reason the yellow signal is smaller than the green is because your scales are different. Look at the bottom of your oscilloscpe: Ch2 says "500mV per division" while channel 3 says "1V per division". You probably get a "low signal amplitude" because you signal is less than "2 divisions" and the scope sugests you to change this. There should be a button named "Autoscale" on your scope which you can hit if you want.

Spurious signals in PXIe 5641R IF transceiver

Hi all,
I am using the example named 'RFSG Single Tone Generation.vi' to generate a signal from the RF signal generator and give its output to PXIe 5641R IF transceiver. And then using the FPGA example named 'Analog Input' for PXIe 5641R IF transceiver, i tried to view the spectrum of the generated signal. The spectrum shows some spurious signals that disappear with the reduction in signal span. I have tried it with different Signal Span options and the results are shown in the files attached. I am getting these spurious signals even if i don't give any input to the IF transceiver.
Any ideas why is this so?
Thanks
Attachments:
PXI 5652 [Signal Generator].JPG ‏28 KB
PXIe 5641R [IF Transceiver].JPG ‏71 KB

The center frequency of the generated signal was 2MHz and power level was -30dBm.
I have attached another image that shows the results when there is no input connected to AI port of PXIe 5641R. I get this peak of a very high level at the specified AI center frequency.
Attachments:
5641image.JPG ‏128 KB

Route signal from pxi 6602 to RTSI

Hi,
I have a problem to export pulse from pxi 6602 to RTSI0. The code is simple as follows:
DAQmxCreateTask("",&taskHandle);
  DAQmxCreateAOVoltageChan(taskHandle,"AO/ao0","",-10.0,10.0,DAQmx_Val_Volts,NULL);
  DAQmxCreateAOVoltageChan(taskHandle,"AO/ao1","",-10.0,10.0,DAQmx_Val_Volts,NULL);
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  DAQmxCfgDigEdgeStartTrig (taskHandle, "RTSI0", DAQmx_Val_Rising );
  DAQmxWriteAnalogF64(taskHandle,2,0,10.0,DAQmx_Val_GroupByChannel,out,NULL,NULL);
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  DAQmxCreateCOPulseChanTime(countHandle0,"TimingIO/ctr0","",
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//  err = DAQmxConnectTerms ("TimingIO/Ctr0Gate", "RTSI0",DAQmx_Val_DoNotInvertPolarity );
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the lines at DAQmxExportSignal(..) and DAQmxConnectTerms(..) both generate big negative number, I spent hours and no answer. In fact I have to use the counter to trigger other boards in my project, I plan to use the route signals a lot.
Sincerely,
Taishan

Hello Taishan,
Thanks for contacting National Instruments.
When you are using DAQmx with a PXI system, much of the signal routing can be handled implicitly by the driver. From your code, it appears that you want to use a counter output to start an analog output task. Please let me know if this assumption is incorrect.
When used while configuring your analog output task, the following function will cause the internal output of Counter0 to be routed automatically over the PXI backplane to the analog output device. I have assumed that your PXI-6602 is in slot 2 of the PXI chassis.
DAQmxCfgDigEdgeStartTrig (AnalogOutputTaskHandle, "/PXI1Slot2/Ctr0InternalOutput", DAQmx_Val_Rising);
The tutorials Getting Started with NI-DAQmx and Learn 10 Functions in NI-DAQmx and Handle 80 Percent of Your Data Acquisition Applications are great starting points for programming with the DAQmx API. Since you are using C, Using NI-DAQmx in Text Based Programming Environments, is a great starting point for comparing the LabVIEW API to the C API for DAQmx.
Please post back if you have any questions.
Regards,
Browning G
FlexRIO R&D

I have a trouble reading signal from PXI-6251

When I want to capture data coming from a loadcell, it shows a graph which has maximum value of 10.5v and the real value is at the minimum. This happens frequently and the graph jumps from real value to 10.5v and then back again to real value. A sample screenshot is shown below, can anybody tell me what is the problem. Also it should be noted that DAQ and board have already been checked with another setup and they work very well so I'm pretty sure that the problem is on developer side!
Regards,

Are you performing any processing on your data? Are you performing a continuous or finite acquisition? Do you see this behavior in the Test Panel as well? How is your load cell wired? Typically load cells need external excitation. If this is the case for your load cell, what is providing the excitation? If this is a bridge-based sensor, then this document would be good to review. Hopefully this helps!
Regards,
h_baker
National Instruments
Applications Engineer
Digital Multimeter Resources

How can i acquire analog signals from PXI 4472 card?

Regards
Aks
(Appreciate answers by giving KUDOS)
Hit the stars.............. sky is not the limit.

There are a lot of shipping examples for DAQmx. Once you open the example finder (Help>Find Examples), use the 'hardware' listbox at the bottom to find all of the examples that pertain to a 4472.
Message Edited by Dennis Knutson on 10-28-2008 07:30 AM

PXI-2514 triggering with TTL signal

Hello,
I'm looking for help regarding opening and closing of the individual relay on PXI-2514 card through use of TTL signal.
I'll appreciate any help.
And, as this is my first post - hello everyone, I'm glad to be here

Hello, and thank you for your reply.
I'll try to describe it in detail.
I have a PXI with two cards pxi-6115 and pxi-2514.
Using pxi-6115 digital output I've generated a set of two impulses, and first one triggers pfi0 of pxi-6115 and through it aquisition of AI0.
I wanted the signal on pfi0 of pxi-6115 to trigger pxi-2514 at the same time to close the relay (channels ch0 and dut0) and the second impulse (which does nothing to AI0 aquisition) to open the relay (disconnect ch0 and dut0). As I've mentioned this digital signal is connected to pfi0 of pxi-6115.
I tried to route that signal to pxi-2514 ttl0, but with no luck.
I attach png files with my test solutions.
Best regards

Using two daqmx create channel to acquire signals in random

Hi
I am trying to acquire signals from PXI 4472 with two DAQmx create channels. The channel selection is random. For eg. first create channel i have ch. 0, 2, 4, and 6 and the other create channel is Ch. 1,3,5 and 7. This I can do, but the problem is that I need to write the acquired data in seperate files for each channels and that too in sequential order. How can I do that. I know i need to use the loop but how will I will select the channels from two different task.
Thanx in advance
Nitin

Ok, here was my idea, I am not sure if it will work for you or not after looking at your VI.
You can use some of your subVIS that you made to make the path different for each file. But what I had in mind for the channels was what I did in the vi i attached. You can just repeat the process for each of the channels and you would know that they were saved correctly. You could also feed in the iteration number of the main VI while loop to have the binary files change sequentially (ie, data1, data2, etc).
Again, this may not be a route you want to take, you may have other ideas.
Ill try to work on it some more later, but I have to get back to work for now
Kenny
Kenny
Attachments:
pxi subvi idea.vi ‏31 KB

System Monitor for PXI 4-Slot Chassis

Hi all,
I have PXI 4-Slot and PXIe 5-Slot system, which are currently being used for continuous monitoring of some power parameters. Recently, there's a requirement for us to actually monitor the status and health of these PXI systems. I was told that PXI-8250 and NI System Monitor can only work with 8-Slot chassis. Is there a solution smaller chassis? Please advice.
Shazlan

I got the same problem and started a thread in the Idea Exchange:
http://forums.ni.com/t5/LabVIEW-Real-Time-Idea-Exchange/Update-and-extend-NI-System-Monitor/idi-p/17...
Hopefully NI will update the System Monitor soon.

Health signals of PXI?

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