Change number of pulses daqmx

Hi, I'm trying to control a servo-motor using labview, an E-series device and an omron driver. The driver will rotate the motor a certain number of degrees, proportional to the number of pulses sent by the card. I am able to successfully change the pulse frequency, but unable to do the same for the number of pulses, while the program is running.
Does anyone know how to do this?
Thanks in advance,
JAlmeida

Thanks for answering.
I'm trying to control the position of the motor and for thatI have implemented a control algorith that changes the speed of the motor according to the difference between the reference position and the motor position. This happens dynamically as the vi is running. However, this form of control isn't the best, and the motor would respond better if i could send the reference position directly to the driver, as a finite pulse train.
Basically, I need to send successive finite pulse trains to the driver, according to the number of degrees it has to rotate to follow the reference position.
Here's the vi, if you want to see it.
Thanks you,
JAlmeida
Attachments:
serial_control16.vi ‏98 KB

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Finite pulse train generation... how to count number of pulses?

hi guys,
this has probably been solved a hundred times but i just couldnt find it!!
i have a pulse train generation happening on my ni usb-6211... using FREQ OUT, using a divisor on this, and routing it to PFI4.
id like to update my VI so i can specify the number of pulses....
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Hi,
No problem at all, we are here to help. What I’m going to do first is to point you to a bunch of examples for that might give you a better insight of the capabilities of the card in terms of finite pulse generation. What you should be looking at is called retriggerable pulse generation and here are some examples to look at: Retriggerable Finite Pause Trigger Digital Pulse Train Generation, Creating a Delayed, Retriggerable and Finite Pulse Generator, DAQmx - Retriggerable Pulse Train Generation - LabVIEW - CVI - ANSI C - VB.NET - C#.NET and Retriggerable Finite Pulse Train with Changing Pulse Specs.
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Hello
I am using the PCI-6602 Board to produce a finite number of pulses with counter0.
I want to know how many pulses that are already created by the counter, while my program is running and show this number on an indicator on the front panel of my VI.
What is the best way to do this with LabVIEW?
Of course I can use another counter to count the pules and route the output of counter0 to its input.
However I wonder if it is possible to solve the problem without using another counter, because DAQmx internally already uses a second counter to produce the finite pulse train so it should be possible to read this counter, isn't it?
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However, I wonder where I can get such detailed Information about the internal functionallity of the DAQ-devices and the DAQmx driver? Please let me know where you get this information from. (So that I can avoid using this forum in the future)
Speaking just for myself --- the source has been generally the school of hard knocks. I started doing a lot of special timer/counter work right around the Y2K timeframe. The legacy driver now known as traditional NI-DAQ was then the only game in town. The programming and terminology under trad. NI-DAQ tends to require you to understand the hardware at a lower level. The programming used more counter-specific terminology like Gate and Source signals.
So for a lot of this stuff, I came into DAQmx with a good understanding of the low-level hardware capabilities, and I just needed to tromp around a bit to find the right syntax. Consequently, I'm not much help for pointing you toward info sources as I haven't relied on them much. Meanwhile, good luck with the self-teaching but don't feel compelled to "avoid using this forum in the future."
-Kevin P.
Message Edited by Kevin Price on 11-01-2007 10:04 AM

Number of pulses

Hello every one ;
I intend to measure the speed of a varying speed wheel using a photo-coupler (ir transmitter/receiver) is used in order to detect the number of rotations i have found the output to be a train of pulses that vary in frequency with the speed of the wheel
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Attachments:
my version.vi ‏56 KB

Hi arifat2k,
If I understand you correctly, you want
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DAQmx » Counter Measurements » Count Digital Events » Count Digital Events.vi.
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Please post back with any questions. If you do, please include more information about your hardware and application. Have a great day!
Message Edited by ryan_d on 11-06-2007 04:43 PM
Ryan D.
District Sales Manager for Boston & Northern New England
National Instruments
Attachments:
timing.png ‏8 KB
Count Digital Events - timed.vi ‏32 KB

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