Use digital inputs to choose inquiry sequence?

Hello,
Is it possible to use a couple of the NI-1456 CVS TTL Digital Inputs to select which specific Inquiry Sequence should be ran?
I currently own NI Vision Builder for Automated Inspection. I do not own LabView.
I am using a NI-1456 CVS and firewire camera. My solution will use the NI-1456 CVS stand-alone. It will not be connected to a VGA monitor, or to a computer. I intend to use the system to detect flaws in silicon wafers. Due to several possible wafer sizes and shapes, I will have to develop an Inquiry Sequence for each wafer type. I would like to have the NI-1456 CVS unit contain several Inquiry Sequences.
-Rick

Hi Rick -
Actually, this is a very commonly used feature of VBAI! From the Configuration Interface, choose Tools»Configure Inputs/Outputs. This will pop up a settings window for the entire inspection process. The second state (called "Change Inspection?") allows you to configure a Product Selection port. The digital byte written to this port will determine which inspection script to run. From the listbox, you can choose NI CVS/IMAQ IO Product Selection to use your CVS's digital input port for this feature.
More information about this feature can be found int he NI Vision Builder for Automated Inspection Configuration Help, under the following index: Vision Builder AI Tools»Configuring Inputs/Outputs»NI CVS-1450 Series I/O. Note that the ISO inputs are used for this feature, not the TTL inputs.
David Staab, CLA
Staff Systems Engineer
National Instruments

Similar Messages

Measure rpm and PWM signals using digital input of NI9401 module

Hi, is there a simple way how measure rpm (to 5000 rpm) and PWM (about f=3kHz) signals using digital input of NI9401 (ultrahigh-speed digital I/O) module plugged in NI 9172 ? I will wellcome any suggestions and VI examples (bether still). I'm begginer using LView 8.2. I apologize for my poor English. Many thanks.

Hi CUA,
Since you have already the right tools, you just need to get started with the software. The NI-9401 will give you access to the counters that are inside the cDAQ chassis 9172.
You need to place the module in slots 5 or 6. You can read in how they work and how to configure them in the counters section of the user guide found here.
Now to measure rpm, you can either measure the period of the signal (seconds) and multiply by 60 to have minutes and the number of ticks per revolution. You can find a shipped example to read period called “Meas Dig Freq-Buffered-Cont-Large Range 2 Ctr.vi” found under Hardware Input and Output » DAQmx » Counter Mesurements
To measure PWM, it is similar procedure and you can read the semiperiod (high time or low time). There is also a shipped example called “Meas Semi-Period.vi” found under the same location.
There is great information for these kind of task at this page or just post back if you need to.
Hope this helps.
Gerardo O.
RF Systems Engineering
National Instruments

How can i measure the time between two successive rising edges ,using digital input ..

Hello
I'm trying to measure the time in seconds between each two successive rising edges on a digital input .
Till now I have managed to detect the rising edge ,increment a counter with each rising edge ,and snap the time at which the rising edge happenned
all I need now is to subtract the current rising edge time from the previous rising edge time in order to calculate (T) which can be 1/frequency and display it in realtime to the user.
but I don't know how to do this
Can somebody please help me !!!
note: the time that I'm measuring ranges between 200 ms - 2 seconds
Solved!
Go to Solution.
Attachments:
Counter without time.vi ‏11 KB

Cheers for that. It's always a good idea to post your SubVIs as well - the problem could be in one of those.
To help you out:
You already know how to use shift registers so why not use one again for time? Create a new shift register for the time then simply compare the "rising edge time" to the the previous time stored in the shift register and then write the new time to the shift register.
Just a few other pointers:
1. You'll want to initialise your shift registers ie wire a constant to the left hand register outside of the loop. This will cause the register to be reset each time the program is run. This is so that your counter will start from zero each time you run your code.
2. You don't need to use the "greater than?" compare function with boolean as they can only be true or false (1 or 0)! The "Equal?" function is what you should use here.
3. Lastly, it's a small thing but you can use the same tunnel that feeds into a case structure in each of the cases - no need to create two tunnels for the true and false cases, use the same one.
-CC
"If anyone needs me, I'll be in the Angry Dome!"

How can I measure the time between each two successive rising edges ,using Digital Input ?

Hello
I'm trying two measure the time in seconds between each two successive rising edges on a digital input .
Till now I have managed to detect the rising edge ,increment a counter with each rising edge ,and snap the time at which the rising edge happenned
all I need now is to subtract the current rising edge time from the previous rising edge time in order to calculate (T) which can be 1/frequency and display it in realtime to the user.
but I don't know how to do this
Can somebody please help me !!!
Solved!
Go to Solution.
Attachments:
Counter without time.vi ‏11 KB

Woah!
Sorry Apok, but your code is becoming way too complicated/messy. I don't think that all of those shift registers or boolean conversion/operators are needed at all.
If you want to measure the timing between two button presses then this is a different (much less complicated) way. It simply records the timing of the button press into a shift register then compares the two.
Spoiler (Highlight to read)
Of course this is a very quick and basic solution just to show you that it can be much simpler than you are making it (remember to use the mechanical actions of the buttons to get the behaviour you want).
A better way would be to use an event structure looking at value changes of the buttons to determine the timings between clicks.
-CC
"If anyone needs me, I'll be in the Angry Dome!"
Attachments:
Time between clicks.vi ‏9 KB

How can you tell how fast you are sampling when using digital inputs to the PCI6014

i am currently sampling information via th edigital inputs of teh PCI6014. However in order to perform FFT and even to use the "Amplitude and Phase Spectrum vi" i need to know my sampling rate so that i can wire this constant to dt.i have attached the Vi that i created as well as some sample data. can you please help me to configure it such that i obtain a correct display of amplitude and phase. thanks
Attachments:
DISPLAY3 ‏40 KB
proper_sampling_at_1Hz.txt ‏1 KB

Hello,
Thanks for contacting National Instruments.
I found some information that I feel will help you to calculate the sampling rate, so that you'll be able to use this constant in your VI. Please see the link below.
http://digital.ni.com/public.nsf/websearch/5782F1B396474BAF86256A1D00572D6E?OpenDocument
I hope this helps you. Please let me know if you need any further support. Have a great day!
Regards,
Joe Des Rosier
Applications Engineering

Trying to create a latching push button using digital inputs

Hi everyone,
I'm writing a program to control a motor with 3 push buttons, Up, Down and Stop. I want the Up button to latch when pushed and delatch when Stop or Down are pushed. I've tried the Resettable Latch.vi example program from this website but no luck. It seems like the output from the AND gate is indeterminate. I've attached my program, Any help would be great! Thanks
Solved!
Go to Solution.
Attachments:
LatchAttempt.vi ‏140 KB

Use Index Array to get the single boolean you want from the array. If you don't wire an index it will give you element 0. Using this you could have all the switches wired to different pins of the same register on your DAQ device. Then you could read one byte and sort out which bit does what. You also need to build the individuale booleans into an array before writing to the DAQ. Here's a quick example:
You need to decide which button sets which bit. I haven't checked the logic of your latch algorithm yet.
Kelly Bersch
Certified LabVIEW Developer
Kudos are always welcome

How to measure RPM using digital I/O

Please tell me how to measure RPM using Digital Input or please give me a code for this.

You probably aren't going to find anyone to just give you code. Especially because you don't specify the hardware you're using. Doing this on FPGA is different than using DAQmx to do it. With FPGA you count pulses over a specified time. Using boolean logic from the digital DI node is a common way but there are others. (if you are using FPGA I can draw up an example, but I believe there is one on NIs website if you search google for it),. Then, if you want, you can run the data through an IIR filter, especially if you have a low resolution or slow moving encoder. Either of these conditions can result in very large difference of RPM even if the actual speed is not varying much (if you need an example why I can provide more detail, but some simple math calculating RPM should explain this. Obviously lower resolution will giv eyou less accurate results).
If you use DAQmx you can set up a frequency task and it will return the number of pulses in a specified time frame; then you can convert this to RPM based on your encoder resolution and take the same steps of running it through a filter to smooth it out if need be.
CLA, LabVIEW Versions 2010-2013

I was given an assingment, but have no idea where to begin. The assingment is to create a text file using notepad with all of my digital inputs and some how make those imputs show up on my digital indicators on my control pannel

I was given an assingment, but have no idea where to begin. The assingment is to create a text file using notepad with all of my digital inputs and some how make those imputs show up on my digital indicators on my control pannel.
When it was explained to me it didn't sound to hard of a task, I have no LabVIEW experience and the tutortial sucks.

StevenD: FYI, I did NOT give you the one star rating. I would never do that!
StevenD wrote:
Ow. Someone is grumpy today.
Well, this is an assignment, so it is probably homework.
Why else would anyone give HIM such an assigment, after all he has no LabVIEW experience and the tutorials are too hard for him?
This would make no sense unless all of it was just covered in class!
This is not a free homework service with instant gratification.
OK! Let's do it step by step. I assume you already have a VI with the digital indicators.
"...but have no idea where to begin".
open notepad.
decide on a format, possibly one line per indicator.
type the document.
close notepad.
open LabVIEW.
Open the existing VI with all the indicators.
(are you still following?)
look at the diagram.
Who made the program?
Does the code make sense so far?
Is it a statemachine or just a bunch of crisscrossed wires?
Where do you want to add the file read?
How should the file be read (after pressing a read button, at the start of the program ,etc.)
See how far you get!
Message Edited by altenbach on 06-24-2008 11:23 AM
LabVIEW Champion . Do more with less code and in less time .

How can I use 4 DIO lines as digital input in a E series-SC 2050-ER8 set up ?

I have a DAQ system with an E series DAQ card that is connected to SC-2050 and ER8. I want to use 4 DIO lines (out of 8) for digital input. How can I do this?

Hello Suresh,
There are a variety of ways to accomplish this. If you are using LabVIEW, you will use the DIO Port Config VI and the DIO Port Read VI. You will use the line direction map input of the DIO Port Config VI to setup which 4 lines you want to be the input lines. The LabVIEW shipping example entitled 'Dig Multi-line Direction (E) VI' shows how to use the lines of the digital port on an E-Series device for input and output.
If you are using NI-DAQ function calls, you can use the Dig_Line_Config and Dig_In_Line calls to configure a digital line for input and then read from that line.
I hope this helps.
Regards,
Todd D.
NI Applications Engineer

Reading a PWM and determining pulse width using a digital input pin on a NI 9425 DAQ

Hello!
I have been experimenting with LabVIEW for about a week now and have run into a brick wall. I have found a fairly effective way of reading a PWM signal through an analog input and determining the pulse width. However, it is becoming necessary for this project to do this same thing using a digital input. I've been playing with this for about a day now and am not making much headway.
For reference, I will be using a 9524 device
Any ideas?

Also, if it is helpful at all, I've attached two vi's. One, functions just as I need it to - but it doesn't involve data aquisition. The second should be similar to the first, but is non functional - I keep getting an error that my amplitude is zero.
Any thoughts?
Attachments:
DigitalEdgeDetectionKnown.vi ‏47 KB
DigitalEdgeDetectionRead.vi ‏148 KB

I want to measure rpm using 100 ppr incremental encoder via digital input

i want to measure rpm using 100 ppr incremental encoder via digital input max speed (4000 rpm)
am using 9178 c-DAQ chassis and 9426 digital input module
pl provide me example code for this

Hi asaccullo.
The recommended settings for encoders are using the counters in the daq cards. Using digital I/O’s is not recommended, the encoders send digital signals but one of the main differences between using digital IO vs counters is that counters are designed to handle these type of events.
Here I found several examples in ni.com/code that you might check:
Imitation Quadrature Encoder with DAQmx Counter Tasks
Use Counter Frequency to obtain an Encoder Rotational Speed
An Elvis is a daq device, so this should work for you.
I also found an example for myDAQ, it uses the DIO but with a counter task in the set up.
Regards,
steve.bm
AE | NI

No input using Realtek RCA digital input

hi
I'm using a HP pavillion with Realtek audio software, i've had this for about a year now.
I'm trying to convert my Minidisc's to MP3's on my PC. I've got a optical to Coax converter and using the optical out on my minidisc player connected to the Coax (Rca digita)l input on the PC but there isnt any sound.
if i connect the standard Phono out from the Minidisc to the mic input this works fine without any issue.
if i click test for playback etc in sound for digital audio i dont hear anything
Any ideas as to why theres no sound when using the digital input.
P.s. i'm pretty sure through a lot of test and checks (ie connecting to other devices) that the prob isnt with the output or cables being used
many thanks for any help

Hi
Firstly, sorry for not being able to help as I share the same problem.
I've recently bought a novation nio 2/4 audio interface for logic pro 8.
I have the same problem with getting sound from it. What are you trying to record e.g. instrument?
I also have a usb midi keyboard that I plugged straight in and got sound through logic straight away so I don't know why the audio interface should be much different.
Please let me know if you happen to stumble across an answer as it is driving me crazy!

HT4437 Need apple tv input....i have a receiver with two zones. Zone 1 which is my surround which streams from my itunes fine but zone 2 to my deck, same input doesnt stream. Using digital opt in auxillary. Will i need apple express instead to play 2nd zo

Need apple tv input....i have a receiver with two zones. Zone 1 which is my surround which streams from my itunes fine but zone 2 to my deck, same input doesnt stream. Using digital opt in auxillary. Will i need apple express instead to play 2nd zone?

The vast majority of zone 2's on home theatre systems don't support digital audio.

Can you perform simultaneous timed digital input and output using a PCI-6120?

Is it possible to do simultaneous timed digital input and output using a PCI-6120? It seems that timed digital operations require using the group read/write commands, which utilize an entire port. Since the PCI-6120 has only 1 digital I/O port, I would like to be able to use 2 lines as outputs and 1 line as input, and do both in a deterministic fashion. i.e. create a digital signal with known pulse widths and read an input line at a known time after the outputs were set. Is this possible to do with only one digital I/O port?

Hello,
This can be done in LabVIEW. There is actually an example that installs with NI-DAQ.
Below is a link to a Knowledge Base that explains how to find the correlated digital I/O examples.
http://digital.ni.com/public.nsf/websearch/B849664604EB34B886256D12005B5520?OpenDocument
Just take a look at the example titled �Continuous CDIO with external clock (E).vi�
Best regards,
Justin Tipton
National Instruments

How to use an Digital input as an Boolean?

Dear all,
I want to set up a digital input signal as a Boolean function. How can I do that?
I also want to know how I can get Digital output lines which are all in DataAquisition box into different lines on my LabView screen? Is this possible with an array?
Cheers

We need more information before we can give you the info you need.
What type of boolean function do you want (digital waveform, array of booleans)? A boolean on the front panel can be programmed to do many things on the block diagram. You will probably want more than one. For example, one boolean to set a value, another to signal the program that you want to add a value.
Getting data from a data acquisition device into LabVIEW can be either trivial or difficult depending on what the manufacturer of your data acquisition device provides in the way of drivers. If the device is a National Instruments device and supports digital input, it should be pretty easy. Look at the documentation and examples that came with the device. If it from another manufacturer, look for a LabVIEW driver for it from the manufacturer. If neither exist, you will need to write a driver yourself. This is usually straightforward, but tedious. It can get difficult if the manufacturer does not publish good interface specifications. Once you have the data into your program as a digital waveform, displaying it on a digital graph is as simple as dropping the graph on the front panel and wiring the digital waveform to it on the block diagram.
I would highly recommend you run through the LabVIEW tutorials on the main NI website. There are several, depending upon how much time you have.
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Use digital inputs to choose inquiry sequence?

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