PCI 7342 digital output

I am using PCI 7342 motion controller and UMI7772. There are 6 relays in my system, which are 24Vdc coil voltage and 37mA coil current for each. Can I use digital output on PCI 7342 through UMI7772 to drive these relays?
PCI7342's digital output is 0-5V, 24mA, but through UMI7772, I can get 5-30Vdc, 100mA output. Am I right? I am not sure 100mA is total or for each output.
Thanks for reply.

Don't forget that a relay is basically an inductor and therefore the inrush current can be somewhat higher than the rated current. But I don't think that this might cause problems in this application.
In any case you should connect a breakdown diode in parallel with the relay coil to keep off inducted voltage from the 734x outputs, or some other snubber circuitry.

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PCI-7342 Digital I/O example

Does anyone have an example of reading/writing to the Digital I/O ports on a PCI-7342? (2-Axis Stepper/Servo Controller with Digital I/O) I'm very new to Labview and am having difficulties using the labview environment commands.
Right now I have a simple setup where I have a framed sequence where I do the following in this order:
1. Configure port 1 as output
2. Write $FF to port 1
3. Configure port 1 as input
4. Display value of port 1
Of course, nothing lights up at all. I've tried changing the polarity and the MOMO values, but still no signs of life.
Can anyone help? Examples are preferrable :-}
Thanks,
Jeff

Dennis,
Good point. At the time, I was thinking that if I wrote to the port then immediately read it, the value would still be there. But now, I see what you mean.
But I still have some problems... Using the attached VI I don't know what the right sequence is for writing to the port. The problem is that the "Set I/O port MOMO" function doesn't seem to have any effect. However, when I flip the bits on the "Set I/O Port polarity" function it outputs to the port!
I though that the polarity function just determined what ON meant(i.e ON=0v or ON=+5V). Is this true? No matter how I set the MOMO, it doesn't seem to have any effect on the output. Only the polarity controls it.
Any ideas?
Jeff
Attachments:
Motor_IO_Test.vi ‏42 KB

PCI-6023E & digital output

Hello,
I have a PCI-6023E and I want to generate a continous pulse train with a digital output line, and I need to know the maximum frequency for this pulse train that I can generate.
Thanks a lot for your answer.
Regards, Anacelia

Hi Anacelia,
You should not realy on this answer without verifying with NI first. So here goes.
Page 347 of the catalog indicates the supported data transfer mode is "programed I/O". This indicates that each line state change must be initiated by an operation of the controlling software. Therefore, the upper frequency limit is determined by how often the code that sets or resets the line runs.
So, the upper limit is determined by the software and the environment it is running in. If you are woring in Windows environment, and your machine is faster than about 400 Mhz then there are two factors to concider when answering your question. How fast does the code run, and how deterministic is it.
If determinism is not an issue, you could resonably expect to get
about one update every 10ms if the code is clean. This would give you 100 update per second or about 50Hz.
If determinism is required, and you are not running in a Real Time environment, the above estimates should be backed off. Anything above 5-10Hz is going to be questionable.
Like I said, verify what I have said with NI.
I hope this helps,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Creative X-Fi Titanium PCI-E (Digital Output)

Hi,
at the moment I'm using an onboard chip from Realtek. And the only way to get 5. Sound trough my Digital Output (DVI-Slot of my Zotac 8800GT) is when playing a?DVD-Movie or somthing similar. I only get stereo sound, when playing games.
Now I'm interested in the "Creative X-Fi Titanium PCI-E Retail". Can this Soundcard pass the sound through my Digital Output (DVI-Slot of my Zotac 8800GT) in 5.. Or is it a general problem, that 5. Sound of Games can't be pass trough Digital Output?

The Creative X-Fi Titanium PCI-E supports Dolby Digital Li've and DTS Connect which will allow you to have 5. audio from your games via S/PDIF out.

Trouble specifying TTL for digital outputs from PCI-6221

Hi!
I'm trying to generate TTL output signals using a PCI-6221 daq board - within Labview, I'm using DaqMx to create two digital waveforms and then write these. When I plug in an oscilloscope, the shapes/frequencies of the signals are correct, but the lower value is 0V, and the higher value is 1V, rather than the TTL values. Is there a way to specify these voltage levels to TTL within the software? I see from NI help that "do.logicfamily" exists to specify TLL, but when I add a property node and connect it to the channels, I do not see Logic Family as an option under "digital output." Let me know if you have any ideas!
Thank you,
Emily

Set your oscilloscope to use 1MOhm impedence. Your problem is that the maximum current for those DIO is 24mA. 1V/50 Ohms = 20mA. So you are current limiting the digital outputs. If you need more current, then you need to add in some digital buffer chips that can output more current.
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Unofficial Forum Rules and Guidelines

PCI 6014 and BNC 2110 digital output

Hi,
I try to use PCI-6014 through BNC-2110 to giving on a digital output 5V.
Please give advice or examples.
Thanks

First, there's the Getting Started with DAQmx. Then on the Measurement I/O>DAQmx palette is the DAQ Assistant. Also, open the example finder and from the main tab, go to Hardware Input & Output>DAQmx>Digital Generation. The simplest examples are Write to Digital Port and Write to Digital Line.

TTl output PCI-7342 & SCB 68

Hello,
In my application, I have to control a servomotor. For that, I have the PCI 7342 with the UMI 7764 interface... Also,I would like to use the 32 DIO of the PCI 7342 for send and receive data...( I use the SCB68)
In the SCB 68, I have connected on the port 1 bit 0 an electronic chart to control brakes...But I have to send on this port a +5V signal....
My problem is that I don't know sufficiently Labview to know which is the VI adapted that would allow me to realize this...
I am completely blocked. I would like that you help me.
THANK YOU .
Cordially
Murat

Murat-
You should be able to use the "Set I/O Port MOMO" VI which is under "Analog and Digital I/O" in the Flexmotion palette.

Can PCI 6519 IO card support waveform(digital) output ??

It is quite hard to find out in the spec.
NI group all the series of DAQ board in the spec.
Can anyone tell me if it can support waveform output .
The waveform is about 1Khz
thx very much.

The PCI-6519 does not support hardware-timed digital I/O. You can update the digital output one sample at a time in software, so you are limited by the speed of the computer you are using as to how fast the updates can be.
Michael P
National Instruments

5th media live with no digital output, and now pci slot is dead

you may recall my previous thread, where my 4th media live, still had no spif digital output. well i sent it back to ebuyer and got another one, and low and behold the same, only this one is noisyer and the pci slot seems to be dead!
i have tried a couple of devices in the riser card, and non of them seem to be recognised?
anyone got any ideas.
cheers
john

OK Status update:
I posted this question on the Dutch forum as well. I am happy to tell you all that in the Dutch forum Dragonfly is one of the moderators. He knows his MSI stuff
He gave me the solution to my problem. So just in case anyone else has a similar problem and can't read Dutch, here it is
He advised me to start the Media Live up with no monitor or TV attached to it at all. Then start up with either a monitor or a TV attached to it. Lo and behold.... the problem is solved.
All credits for this solution go to Dragonfly
Greetz,
J@n
PS Mark topic as SOLVED

How to output square wave with pci 6110 from digital output

and the frequency of the wave should be variable and quite precise.

"from digital output" is not possible if
your timing req's are less than a second
and
you are not running Real-Time.
It can be done from the analog output port.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Setting time critical digital output based on axis position (PCI-7358)

HI,
I need to set a time critical digital output based on encoder position (this will switch fast acting valves). I was planning to try the general purpose DIO but I can't find any examples, I have been through the manuals, searched the site etc. Where can I find help with this, all the examples only seem to deal with digital input triggering or RTSI? I'm thinking of an onboard program that just monitors encoder positions and sets digital outputs.
Some time back I seem to remember reading that general purpose DIO should not be used for time critical operations, is that correct? And if so what are the other options - RTSI going to another DIO board? The DIO really needs to be deterministic, is RTSI the only option?
Any advice appreciated / Martin
Certified LabVIEW Architect

Even with an onboard program you will always get a delay of several milliseconds between your axis has crossed the position and until the digital outputs are set. If this is ok for you then you could choose this approach.
For the case that you only want to toggle one digital line the Breakpoint feature should be the best solution as it toggles the breakpoint output almost immediately when the breakpoint positions are reached.
If you need to change a whole pattern instead of only a single line then the approach you mentioned would be the best solution (RTSI and high-speed DIO like the 653x boards). Combine this approach with the breakpoint feature by routing the breakpoint output to RTSI and using this as a update clock signal for the DIO board.
Best regards,
Jochen Klier
National Instruments Germany

USB-6009 pulse train generation with digital output....

Hello!
I've bought a new USB NI-Card (USB-6009) and now I'm trying to adopt an old vi that uses traditional DAQ drivers. I wrote that vi for a PCI NI-Card (PCI-6024E), which has two counters to generate two pulse trains simultaneously. Now I've only one counter and that's why I'm searching for a good way to create pulse trains using a digital output! The pulse trains are both ranging between 100 Hz and 100 kHz.
I'm sure somebody has an idea how I can solve the probem in the best way
Kind regards,
Peter

You can't do it with this low cost board. Both digital and analog outputs are software timed only. The analog out is rated at only 150 samples/sec and the digital is about the same. You can't even use one of the counters because it is not a hardware timed counter output. It is an event counter only as an input.

How to give delay in switch on digital output lines

Hello All,
I am working on PCI-6514 Digital IO card, I am writing a sequence to my application using DAQmax for Digital input and output lines
I want to switch on one output line0 and after a delay 5sec switch on line1 output and after a delay of 3sec switch on line2 output and sense input line 0 and line 1 .
How can we know the status of output ie output is on or off.
Since i am using the IO card for first time suggest me in this.

Hi
I am going to assume that you are using LabVIEW 7.1 for this application. If you are trying to acquire data from an external device after outputting data to that device, the DAQmx tristate property node will give you this functionality.
You will then need a DAQmx write.vi to output your digital data followed by a DAQmx channel property node. Select Digital Output>>Tristate on the property node and wire a true constant into it. After the property node, you can use a DAQmx read.vi to read the data coming into the digital lines. By using the tristate property node, you can avoid stopping the digital output task and starting an entirely new task. I am attaching an example program that will demonstrate this.
Regards,
Hal L.
Attachments:
digital input and output.vi ‏39 KB

Create 4 digital output pulses base on input ttl signal

Hi
I am a beginner in Labview and would appreciate any advice on how to solve the following problem.
I am creating a TTL pulse train, and would like to send that into Labview as input. For every falling edge detected on the input signal, I'd like Labview to generate 4 digital output pulses. For each output pulse, I'd like to be able to specify the delay, and duration. The picture should illustrate it more clearly, with the numbers showing the intended order of magnitude.
System: NI PCI-6733 DAQ card, Labview 8.5
My daq card has 2 24-bit timers, and 8 digital I/O but I don't know what the best approach is for creating between 4-8 output pulses of this precision..should it be handled in hardware, or in software? And how would I go about it
Thanks,
-Sidney
NI Hardware: PXI-7853R, PCI-5122, PCI-6733, PXI-1036, PCI-MIO-16E-4, PCI-6110
Computer Hardware: Xeon Quad Core - 2.33 Ghz, 8 GB RAM
Software: Labview 2009, Labview FPGA 2009, Vista 64-bit, MAX 4.6, DAQmx 9.0, NI-SCOPE 3.5
Solved!
Go to Solution.

Hi Yann,
Wow, thank you so much for this example! I'm trying to take a look at it, but when I run it.. it responds with the following error message
Error -200452 occurred at Property Node DAQmx Trigger (arg 1) in DAQmx Start Trigger (Digital Edge).vi:1->reprise-1.vi
Possible reason(s):
Measurements: Specified property is not supported by the device or is not applicable to the task.
Property: Start.TrigType
Task Name: _unnamedTask<49>
This is strange too, because ive already used the Digital Edge Start trigger for a different application with this card.
-Sidney
NI Hardware: PXI-7853R, PCI-5122, PCI-6733, PXI-1036, PCI-MIO-16E-4, PCI-6110
Computer Hardware: Xeon Quad Core - 2.33 Ghz, 8 GB RAM
Software: Labview 2009, Labview FPGA 2009, Vista 64-bit, MAX 4.6, DAQmx 9.0, NI-SCOPE 3.5

How can I send digital Output at faster rate than 1ms period?

Hi!
I'm using a PCI-6229 to send digital outputs to a power source and I need to send n different numbers in binary code. I need this to be periodic so I've used a while structure and the diferent numbers as the different components of an array. In this way the while loop writes the "task" repetedly at the period I have set to the loop using "wait until next ms multiple". So, it does what I want. The problem is that I need the loop to work at a higher rate than ms. It would be great if I could make it go at 0.01 ms. I have tried and even when the "wait until next ms multiple" doesn't like doubles it tries to work at this rate but the signal is not 100% periodic and I need it to be much more precise.
Does anyone have an idea to solve my problem?
Thanks a lot,
Júlia

I think the example you want to look at is Digital - Continuous Output.vi. You can just use the onboard clock and set the sample rate to whatever you need (100kHz it looks like).
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PCI 7342 digital output

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