VBAI: Fire a pulse every N msec based on inspection status

The VBAI Delay function seems to have the functionality I am looking for, but it is too coarse in that the time lapse is 1 second minimum.
I have a Smart Camera (1772). I am doing an OCR inspection that could take a somewhat varying amount of time. I would like to fire a rejector if the inspection fails. The rejector must fire at a fixed amount of time after the camera is triggered. If I cannot reliably do that, then I need another controller in the system which I should not need because the Smart Camera shoulkd be more than adequate. I know it can be done in RT, but I would like to keep things in VBAI for ease of Customer training.
Sequence of operations:
1. Parts travel under 1772 on a conveyor
2. Sensor triggers 1772 when a part is present
3. Image is acquired and processed. OCR inspection performed
4. If OCR inspection fails, fire output pulse exactly 100 (for example) milliseconds after the trigger from step 2
5. Repeat from step 2
Any idea how to achieve that in VBAI?
Thanks,
Dan
Solved!
Go to Solution.

You could have a Generate Pulse step before your acquisition where the pulse is configured to generate a pulse based on a trigger (so configure a continuous pulse and wire you acquisition trigger to an ISO Input line as well that will trigger the output). Now this is the important part...you need to make sure your processing is done before the 100ms or whatever delay you specify or the pulse will begin. If you determine that you don't need to pulse based on your processing, transition to a state where you stop pulse generation on that line to stop it before it happens. In either case, transition to the End state and then the inspection can start again with the state that has the Generate Pulse/Acquire/Process and so the pulse will be reconfigured again for the next part.
If this doesn't work for you, then you could try a SW timed approach. You could have a Run LabVIEW step that gets an accurate timer value when the acquisition step completes, and another VI call that will wait for a user specified amount of time (millisecond resolution) before it continues.
I would recommend the first option since it will be hardware timed (but requires some extra wiring), and if that doesn't work, I can help you with a VI that will do the SW timed behavior you want.
Hope that help,
Brad

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Output pulse every n units for x4 encoder

I found this on the National Instruments website showing how to ouptu a pulse every N input pulses, the issue is that I'm trying to do this on X4 decoding. I have a NI9178, NI9401 and a NI9201, I'm trying to input an X4 encoder to my counter and subsequently output a pulse every N steps on a seperate line to trigger an external piece of hardware. My encoder has 200PPR and runs at about 2000RPM.
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So I have been trying to figure this issue out by using the forums and all I've managed to do is confuse myself.
I'm "simply" trying to output a series of pulses after counting N number of input pulses. Here is the VI I'm working on (adapted from a previous forum post - Encoder VI for NI.vi is the main program). There is one counter input and one counter output, along with some analog inputs (which for now can simply be ignored). I'm trying to count the ticks off of Phase A from the input encoder and subsequently output a pulse every 100 ticks on the output counter task.
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Attachments:
Encoder VI For NI.vi ‏54 KB
Analog Graph2.vi ‏21 KB
Get Terminal Name with Device Prefix.vi ‏50 KB

(pci-6052E) I want to genarate a pulse every time the counter is zero.

I'm using the counter on my pci-6052E to count the number of pulses on a line. The count goes up and down since I have a direction signal. Now I need and indication (a pulse) every time the count reaches zero. This is similar to the breakpoint function on your motion controllers. Is this possible....

Yes you can, and here's an example that worked with DAQmx on an E-series board. Ctr0 counts edges of the internal 20 MHz timebase, rolling over to 0 a little more than once a second. It uses the DAQmx Export Signal property node to program the counter to Pulse on reaching TC (terminal count). The pulse signal is sent to a terminal that Ctr1 uses as its source, so Ctr1 increments each time Ctr0 reaches terminal count (0 value).
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Attachments:
TC Pulse.vi ‏81 KB

I want to genarate a pulse every time the counter is zero.

I'm using the counter on my pci-6052E to count the number of pulses on a line. The count goes up and down since I have a direction signal. Now I need and indication (a pulse) every time the count reaches zero. This is similar to the breakpoint function on motion controllers. Is this possible...."

Hi,
You can generate a pulse whenever the counter reaches Terminal Count (TC). You could try setting TC to zero, but I do not think it will work. You can always poll the count in software until it reaches zero.
Regards,
RamziH.

How do you apply rules based on read status?

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How to omit records based on a status code

I am trying to select records based on a status 'N' or 'A' by a certain date as long as by the chosen date there is not another status given to the same course like 'D' or 'X'.
Here are some sample data...
CREATE TABLE #TEST
(ID VARCHAR(7),
COURSE VARCHAR(10),
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(ID, COURSE, CURRENT_STATUS, STATUS_DATE)
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DROP TABLE #TEST
If the query is to determine how many records with a status of N or A up to and incl August 26, 2013, I should see 4 records... AAAA-1000H, CCCC-3000H, DDDD-4000H, EEEE-5000H
If the query is to determine how many records with a status of N or A up to and incl October 1, 2013, I should see 3 records... BBBB-2000H, DDDD-4000H, EEEE-5000H
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I am trying to select records based on a status 'N' or 'A' by a certain date as long as by the chosen date there is not another status given to the same course like 'D' or 'X'.
Here are some sample data...
CREATE TABLE #TEST
(ID VARCHAR(7),
COURSE VARCHAR(10),
CURRENT_STATUS VARCHAR(1),
STATUS_DATE DATETIME)
INSERT INTO #TEST
(ID, COURSE, CURRENT_STATUS, STATUS_DATE)
VALUES
('0020541','AAAA-1000H', 'X', '2013-08-27 00:00:00.000'),
('0020541','AAAA-1000H', 'N', '2013-08-26 00:00:00.000'),
('0020541','BBBB-2000H', 'D', '2013-11-04 00:00:00.000'),
('0020541','BBBB-2000H', 'N', '2013-08-27 00:00:00.000'),
('0020541','CCCC-3000H', 'D', '2013-09-11 00:00:00.000'),
('0020541','CCCC-3000H', 'N', '2013-08-26 00:00:00.000'),
('0020541','DDDD-4000H', 'A', '2013-08-25 00:00:00.000'),
('0020541','EEEE-5000H', 'N', '2013-08-26 00:00:00.000')
SELECT * FROM #TEST
DROP TABLE #TEST
If the query is to determine how many records with a status of N or A up to and incl August 26, 2013, I should see 4 records... AAAA-1000H, CCCC-3000H, DDDD-4000H, EEEE-5000H
If the query is to determine how many records with a status of N or A up to and incl October 1, 2013, I should see 3 records... BBBB-2000H, DDDD-4000H, EEEE-5000H
...and so on.
Any help is appreciated.
I guess I didn't understand your problem. Not sure if this might help you.
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where CURRENT_STATUS IN ('N','A') AND STATUS_DATE<='2013-08-26'
AND STATUS_DATE NOT IN(Select STATUS_DATE from #test
where CURRENT_STATUS IN ('D','X'))
SELECT * FROM #TEST
where CURRENT_STATUS IN ('N','A')
AND STATUS_DATE<='2013-10-01'
AND STATUS_DATE NOT IN(Select STATUS_DATE from #test
where CURRENT_STATUS IN ('D','X'))
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VBAI: Fire a pulse every N msec based on inspection status

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