CDAQ module for high speed pulse counting

I need to know a USB module which can be used for pulse counting. The pulses are generated from an encoder attached with an stepper motor. It generates 15 pulses per step.Pulse amplitude is 0 to 5V. I am using a compact DAQ system (ni 9178).

The counters are on the cDAQ chassis backplane (there are 4 of them on the 9178). So, in order to use an external signal with the counters you would need a way to route the signal to the backplane. Your available options are:
1. Any digital I/O module with 8 or less lines on it (some modules are input-only or output-only--input modules can be used for counter input tasks only, output modules can be used for counter output tasks only). Modules with over 8 lines transfer the data serially to the chassis backplane and so do not support routing signals through to the counters.
2. The 2 PFI lines on the 9178 (I should have mentioned this earlier, this might be a good option for you to route your encoder pulses without having to purchase an additional module if you only need 2 inputs--that is, no Z index signal). The bandwidth on the chassis PFI lines is lower than that of the 9401 and 9402, I believe the chassis PFI lines should take signals up to ~1 MHz.
3. An analog module with triggering capabilities (at this time only the 9205 and 9206) can route a digital signal (the 9205 and 9206 have a PFI line) or an "analog comparison event" (see my post here) to the counter terminals.
In case 1 above, you configure this by selecting the counter using the module's name (e.g. "cDAQ1Mod2/ctr0"). Default input terminals will be used (check the device pinouts for your module in Measurement and Automation Explorer) or you can select which terminals to use for your inputs using a DAQmx channel property node.
In cases 2 and 3, you would need to select the counter as the internal backplane counter (e.g. "cDAQ1/_ctr0"). You will need to select which terminal your signal is coming from (since the internal backplane counter does not have default terminals. This same method can be used to count internal signals (e.g. sample clocks, counter outputs, etc.) without having to use any of the 3 routing options mentioned above.
Best Regards,
John Passiak

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I need to count intermittent high speed pulses from an outside source with cFP-CTR-502 and labview.

I need to count intermittent high speed pulses from an outside source with cFP-CTR-502 and Labview 8.2 . I've found example code for generating pulses and creating intricate count setups but no straightforward examples of a simple counter. Any suggestions?

Hello tinfish,
I could not find a simple example that implements simple counting either, but it should be straightforward enough for us to try. Do you have the CTR module configured properly in MAX? If so, can you monitor the channels on your CTR 502 for input? Try connecting a square wave or some other digital pulse to the terminal to test the functionality of the counter module first (before programming). If you monitor the input channels with somethign connected you should see the count increment each time it sees a rising edge (assuming default configuration).
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C:\Program Files\National Instruments\FieldPoint\documentation\Online Help\fplv.chm
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I hope this helps -- if it's too high-level we can talk details about specific questions you have. Have a good one!
Charlie S.
Visit ni.com/gettingstarted for step-by-step help in setting up your system

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http://reviews.cnet.com/8301-13727_7-20025542-263.html
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I am looking to count events where an event is defined by 1 ttl pulse of 30ns (A newer device allows for 3V 9ns) I prevoiusly used the6602 but am looking to make a standalone singleboard rio application. When talking to some engineers this I was told that this was possible, but looking at the spect there needs to be a 100ns min pulse width. Are there any work arounds? Is it possible to add sme chip as a prescalar to the input (divide by 10 highspeed counter?) I am stuck and am ready to meke some hardware decisions.
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CLA, CPI, AIA-Vision
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falkpl,
As I am not certain if a moderator can move a post, the best way would probably be to re-post the question on your desired board. Be sure to post a link here to the new discussion. You generally want to avoid double-posting, but as long as it is clear that this discussion was moved to another place, most people will forgive you.
Now, assuming you have not posted elsewhere, I will comment on your issue. The sbRIO's have IO pins that allow you to connect right into the FPGA. As you have found, the manual guarantees a 10 MHz rate and states you can get a bit faster if you are acquiring a single 3.3 V signal.
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A similar idea which will not require external hardware, but maybe a bit more programming is to read the same channel on several inputs with slightly staggered start times. This post discusses the idea a bit more.
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Attachments:
multidevicesync_analoginput_streamtodisk.vi ‏197 KB

Hi,
i can suggest following
Refer to an example VI called as "High speed data logger.VI" in conjunction with "High Speed data logger reader.vi" in Labview examples. Alhrough the logger might be in Tradiditional Daq format, it can be quite easily converted to Daq Mx format to store data in Binary (I32 format) . I have used this for many of my applications and i have found that the data retrieved does not have any "messups".
Why not keep a seperate file for each card? This way, you do not have to load your application with extra process. You only have to acquire and save. After saving in Binbary format, you can retrive it offline, convert it to ascii format and merge the data files of various cards to get one consolidated ascii data file.
hope this helps
Regards
Dev

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Your issue has been escalated to a Verizon agent. Before the agent can begin assisting you, they will need to collect further information from you.
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Mr. Zaatari,
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Kind Regards,
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CDAQ module for high speed pulse counting

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