74F283 sometimes gives wrong output on digital probes

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• Output.VI - Digital missing as well as other vi'

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• Continuous output of digital waveforms on PCI-6602

  I use 6602 PCI to get a continuous 1 MHz square wave output of DIO1 ~ 32 sequentially controlled by LabVIEW. I Ctr0 to generate a clock 2 MHz and used Ctr0InternalOutput as a source of sample for DIO1 clock ~ 32. I have attached the code and the texture as follows.

  The code works fine on PCIe-6251 and digital waveforms of 1 MHz is very stable.

  But when I run on PCI-6602 I got an error-200077 (you asked for: sample clock; you can request: on-demand).

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  Yi

  Version: LabVIEW 8.2

  hardware: PCI-6602

  Hello

  Have you looked at the specification for the 6602?

  http://sine.NI.com/NIPs/CDs/view/p/lang/en/NID/1123

  Click on "specifications".  Scroll down to "digital i/o".  Watch "Timing".  It clearly says "software".

  The DIO lines on this Board are not timed by the hardware.  They are clocked by the software.  The data sheet that explains very clearly.  That's why you see the error clock sample - that the Council can't stand DIO clocked by the hardware.

  The 6251 supports clocked by DIO material, so why your code works very well with this Council.  You can do the generation of signals with a 6602.

  Hope says.

  d

• Why the node formula Eval gives only outputs 9?

  I am allowing the user to input so values and formulas he convert raw data to data acquisition, but output from the Eval formula node values give me only 9 values in table. I don't know why, because I'm him giving 16 formulas, 16 outputs variables, variable input 16.

  Seems to work fine for me on LV10.  I see you have an indicator of the bunch, if you use ArrayToCluster don't forget to right click and set the size of cluster on 16.  When I see 9 it is usually my first assumption.

• What is the best way to Sync Output (TTL) digital with analog output?

  I'm trying to generate analog signals that synchronize the rising edge of a digital signal (TTL). The ttl will be the trigger for the camera. The advice I have is USB-6343 X. In my project, I used a clock as a ttl so I can give frequency easily. Could someone tell me what is the best way to accomplish this task? My project seems to work, but I hope it has more neat way. Thanks in advance for any help!

  Kind regards

  Eric

  Hi Econg,

  They should be nanoseconds, if any, there is a trigger of material goes with a hardware clock.

• How do I output a digital signal to an analog signal

  Hi all, I use a PCI 6221 with LabVIEW 2010 (no add-on) with the CB-68LPR connection block and I want to use an input signal analog of voltage of between 0 V and 5 V of an LDR to change the brightness of an LED, so I can maintain a stable lighting for a webcam capture feature level image and treatment system.

  I can get the analog input voltage of the LDR (set up as a voltage divider circuit) using the DAQ assistant, via the channel of Ain 0 on the use of pins 68 (AI.0), 67 (AI GND) and 14 (+ 5 V) and write it in a graphic and digital display but I don't know how to write the value to a PIN that can be used for PWM I think assistance from pine 40 PFI 13 P2.5 and a digital (GND pin 13).

  I looked at the example of code that was written to produce a PWM signal, but these programs don't signal to a device/circuit, they are just "nothing stuff" that the PWM signal to a graph.

  Can someone help me or direct me to tutorials/code examples which are of real-world applications?

  Hello

  PWM can be done in DAQmx using a task of the meter output.

  I think that example 'PWM-Counter Output.vi' goes quite a long way to do want you want I think. It is located in the LabVIEW examples of shipping.

  I also found here:

  http://zone.NI.com/DevZone/CDA/EPD/p/ID/1710

  This could be useful a read thus:

  http://zone.NI.com/DevZone/CDA/tut/p/ID/2991

  Let me know if it's of any help.

• Output 5V digital while gaining some HAVE

  Hello fans of LV,.

  I am confronted with (what I thought would be) a trivial task:

  I'm certain analog signals on a 6351 OR USB using DAQmx.  And I want to trigger an external device simultaneously.  So I want to start my task of AI, a digital to go HIGH output pin.  And when it stops, I want the PIN to go DOWNSTAIRS.

  I think actually that NEITHER provided an '' integrated '' signal for this... something I could easily move to one of the PFI PIN.  As a "HAVE busy signal."  But it does not appear that this exists.

  So instead, I thought I could do a task "HAVE simultaneous and DO."  It works well, except that the PIN HIGH when rest end tasks.

  Any ideas on how I can fix this?

  josborne wrote:

  Hmmm.  I don't think that the sample clock won't work because it is a pulse train.  It goes UP and DOWN for each point of the data acquired.  Actually, I want the signal stay high during the acquisition of all.

  I think you're right about using a PIN.  But I am confused how to implement in LabVIEW.

  I think I misunderstood what you mean by an acquisition, then.  I thought you meant just a single point.  Are say you that you will acquire a fixed number of samples and you need relaxation to remain high until there finishes the entire points series?

  As I said, I'm not an expert in routing of the signal, so there is probably a more efficient way to do this, but the simplest, you could take a signal from a digital output pin and split with one end going to the external device and the other end to the input trigger to HAVE it (probably that in software, but I don't know if you can split the signal in this case).  Configure separate tasks and the AI, no need to synchronize them.  When you start to DO it, the AI will trigger.  Then you just need to somehow disable DO when HAVE complete - but went too urgent?  If you do not need a precise timing for this purpose then just wait for the AI to finish, then turns off the DO.

• inputs and outputs analog digital usb 6009

  I'm having a problem with my USB 6009 in labview programming.  I try to read continuously from the analog inputs while having an event focused on digital output within the same program/vi.  Basically, I need to taste all the time the analog inputs while having an event defined by the user (button control) to signal the digital inputs to turn on then after awhile.  The event of digital output must be independent of the analog sampling system.  I was throwing the "error already allocated resource" in most of the vi, I wrote to try to achieve.  What is programmatically possible with usb 6009?  I am at my wits end trying to do this and any help would be greatly appreciated (by myself and my boss).  Thanks in advance for your answers.

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