MB51 and MCP8 time delay

Can anyone advise why there could be a time delay between what MB51 is reporting and what MCP8 reports?
For example, on 02/04/2007 MB51 shows 48 units of a product were received, however, MCP8 identified only 40 units. It took a couple of days before MCP8 was reporting the same quantity of 48 units displayed in MB51.
Can anyone help on this?

Hi,
be careful with the dates involved.
In MB51 the date is not necessarily the date of the movement, it is often the document date and this can be different from the actual movement.
Have a look at the material documents concerned and check for all dates Document date, posting date and movement date.
Steve B

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Time delay error

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Best way to capture data every 5 ms (milli-seconds) in the .vi diagram when using "Time between Points, and Small Loop Delay tools" ?

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I have no idea what "Time between Points, and Small Loop Delay tools" is. If this is some code you downloaded, you should provide a linke to it. And, if you want to acquire analog data every 5 milliseconds from a DAQ board, that is possible with just about every DAQ board and is not related to the version of LabVIEW. You simply have to set the sample rate of the DAQ board to 200 samples/sec. If it's digital data, then there will be a problem getting consistent 5 msec data.

Urgent: Please help. how to solve the time delay during buffer read and write using vc++

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Hello kgy,
It is a bit of a judgment call. You should just choose the board that you think has the most to do with your issue. For example, this issue was much more focused on setting up your data acquisition task than the Measurement Studio environment/tools, so the MultifunctionDAQ board would have been the best place for it. As for moving your post to another board, I do not believe that is possible.
Regards,
Dan King

Time Delay Connector and Chart Question

Hello,
I have two problems with the VC 7.1
First, how can I design a time delay or a refresh function? In VC 7.0 you have the time delay connector to implement this function.
Second, in VC 7.0 I can click on a chart and start a action to show me the data of this data series. In VC 7.1 I don' t found something like that?
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the output of the VISA read i got is call read buffer, but it still seems like a number instead of a string?
Attachments:
data.png ‏1 KB

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Contradiction between time delay and fetch bmp file

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Go to Solution.

So you are using a file in order to pass data between loops? That a major race condition. Try using a User Event, Queue, or Notifier to send the picture to your other loop.
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Time delay between 2 waveforms

Hi,
Please bear with me while I explain what I’m trying to do :-) Basically, in the attached LabView file (“flow vis + trigger-m.vi”), I am generating 2 signals: a sinusoidal waveform (used to drive an actuator) and a square waveform (used as a TTL signal to trigger image capture on a CCD camera). Currently when I run the program using LabView 7, both signals are started simultaneously. I would like to introduce a time delay that can be manually specified in the VI, such that when the program is started (i.e. at time t0), the sinusoidal waveform also starts (i.e. at time t0) before the square waveform (i.e. at time t0 + delay time). In a practical sense, this means allowing the actuator to run for several seconds before capturing any images.
It sounds like it should be quite straightforward to do, but I’m not so sure how to progress. I have begun to modify the original VI (“flow vis + trigger-m_2.vi”, as attached), but would be much appreciative of any help or suggestions on how I can complete the VI to meet the above requirement.
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Mark
Attachments:
flow vis + trigger-m.vi ‏939 KB
flow vis + trigger-m_2.vi ‏895 KB

Please refer this URL for an example VI I made to solve the problem:
http://forums.ni.com/ni/board/message?board.id=170&message.id=227603
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Creating a Time Delay Between 2 Waveforms

Hi,
Please bear with me while I explain what I’m trying to do :-) Basically, in the attached LabView file (“flow vis + trigger-m.vi”), I am generating 2 signals: a sinusoidal waveform (used to drive an actuator) and a square waveform (used as a TTL signal to trigger image capture on a CCD camera). Currently when I run the program using LabView 7, both signals are started simultaneously. I would like to introduce a time delay that can be manually specified in the VI, such that when the program is started (i.e. at time t0), the sinusoidal waveform also starts (i.e. at time t0) before the square waveform (i.e. at time t0 + delay time). In a practical sense, this means allowing the actuator to run for several seconds before capturing any images.
It sounds like it should be quite straightforward to do, but I’m not so sure how to progress. I have begun to modify the original VI (“flow vis + trigger-m_2.vi”, as attached), but would be much appreciative of any help or suggestions on how I can complete the VI to meet the above requirement.
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Attachments:
flow vis + trigger-m.vi ‏939 KB
flow vis + trigger-m_2.vi ‏895 KB

Hi Mark,
I forgot that all analog waveforms generated needed to have the same number of samples in a single task. By introducing a delay into your square wave, I effectively added samples that waveform. So the same number of samples added to the square wave has to be added to your sine wave. I added code that extends the number of samples of your sine wave (# delay + square wave samples). Let me know if this works for you.
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Attachments:
flow vis + trigger-m70.vi ‏872 KB

My recirculating pump in sub vi simulation link doesnt work in the second iteration .It opens for maybe half a second whereas i gave the time delay for 5 secs..plz help very urgent

Hi,
I have attached my simulation loop.In the model attached i hav eone main pump with constant rpm which drives the 5 smaller pumps and fills the tank at the same time.As soon as the tanks reach their 90% level,the valves of the five pumps close(SP1,SP2,SP3,Sp4,Sp5).After that the recirculating pumps opens for 5 secs of the first tank.As soon as the recirculation finishes,the drain valve(SV1) for tank 1 open and the volume goes to interim storage.This happens for all the remaining tanks.
My simulation works the first time,but when the second time the loop starts,it skips the recirculation pump even though i gave a time delay for 5 secs.Plz help ..I have attached the simulation.
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Attachments:
Spatial Logic_2_Final.vi ‏223 KB

Rami,
I suspect that you have a race condition. The widespread use of local variables frequently leads to race conditions. Your subVI (Spatial Logic Sub_2.vi was not included) so I cannot run the VI. You have no way of knowing whether the subVI or the inner case structure will execute first, because there is no data dependency between them.
I think a shift register or a few and some dataflow thinking would allow you to eliminate the inner case structure, the local variables, and, probably, most of your problems.
Some of the SPi are indicators and some are controls. How are they used?
The last case of the inner loop retursn to Case 1. Would case 0 be better?
As for the second time through issue, it may be related to the Elapsed time function Auto Reset. From the help file: "Resets the start time to the value in Present (s) when the Express VI reaches the Time Target (s)." If more than 5 seconds elapses between the first time you use this and the next, it will exit immediately on the subsequent calls.
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How do I control a data log session with period and sample time?

I need a data logging system where the operator can select 2 logging parameters: Log Period and Sample Time. I also need a START and STOP button to control the logging session. For example, set the log period for 1 hour and the sampling time for 1 second. (I may be using the wrong jargon here.) In this case when the START button is clicked, the system starts logging for 1 second. An hour later, it logs data for another second, and so on until the operator clicks the STOP button. (I will also include a time limit so the logging session will automatically stop after a certain amount of time has elapsed.)
It’s important that when the STOP button is clicked, that the system promptly stops logging. I cannot have the operator wait for up to an hour.
Note that a logging session could last for several days. The application here involves a ship towing a barge at sea where they want to monitor and data log tow line tension. While the system is logging, I need the graph X-axis (autoscaled) to show the date and time. (I’m having trouble getting the graph to show the correct date and time.) For this application, I also need the system to promptly start data logging at a continuous high rate during alarm conditions.
Of course I need to archive the data and retrieve it later for analysis. I think this part I can handle.
Please make a recommendation for program control and provide sample code if you can. It’s the program control concepts that I think I mostly need help here. I also wish to use the Strip Chart Update Mode so the operator can easily view the entire logging session.
DAQ Hardware: Not Selected Yet
LabVIEW Version: 6.1 (Feel free to recommend a v7 solution because I need to soon get it anyway.)
Operating System: Win 2000
In summary:
How do I control a graphing (data log) session for both period and sample time?
How do I stop the session without having to wait for the period to end?
How do I automatically interrupt and control a session during alarm conditions?
Does it make a difference if there is more than one graph (or chart) involved where there are variable sample rates?
Thanks,
Dave

Hello Dave,
Sounds like you have quite the system to set up here. It doesn�t look like you are doing anything terribly complicated. You should be able to modify different examples for the different parts of your application. Examples are always the best place to start.
For analog input, the �Cont Acq&Chart (buffered).vi� example is a great place to start. You can set the scan rate (scans/second) and how many different input channels you want to acquire. This example has its own stop button; it should be a simple matter to add a manual start button. To manually set how long the application runs, you could add a 100 ms delay to each iteration of the while loop (recommended anyway to allow processor to multi-task) and add a control that sets the number
of iterations of the while loop.
For logging data, a great example is the �Cont Acq to File (binary).vi� example.
For different sample rate for different input lines, you could use two parallel loops both running the first example mentioned above. The data would not be able to be displayed on the same graph, however.
If you have more specific questions about any of the different parts of your application, let me know and I�ll b happy to look further into it.
Have a nice day!
Robert M
Applications Engineer
National Instruments
Robert Mortensen
Software Engineer
National Instruments

DAQ AO to AI time delay

Hallo,
I'm working on an academic control project, where I need to read (ni9215) 3 or 4 channels very fast,
process the data and write them back (ni 9263) via usb-chassis 9172. To check the accuracy and time
delays I tried a loop from AO to AI (only one channel) and generated a step, saved the timestamp of the
step and checked, when the step was readed in the written measurement log. I doesn't see andy difference
in using two VI's to read and to write or combining them in one VI, so I added images of two VI's.
While comparing the timestamps of the sampled step and the log file, i noticed time delays of about 200ms
from output to input. So my VI's are times too slow for my control purpose... anybody knows, what to try?
In this VI I read data with 500hz, 10 samples to read and 10 samples/channel. The read timeout is set to
default, but if I set it to zero, strange (negative) times are written to the measurement log... I tried
to change from N samples acquisition to single sample acq, but it didn't speed up the VI.
Thanks for answering!

Hi IoInNBlack,
first of all thank you for posting in this forum.
I think you should synchronize your input/output operation, otherwise I don´t understand how you can take the timestamps and consider them
reliable for your evaluation. I suggest you to modify the LV example here attached with timestamps and file I/O to build up your test and see what results you get then. Consider also that 20 ms are necessary for the acquisition of the samples and then you have add the time necessary to manage the file I/O.
Best regards.
Andrea P.
Message Edited by pxchellone on 07-06-2009 09:23 AM
Attachments:
Multi-Function-Synch AI-AO.vi ‏35 KB

MB51 and MCP8 time delay

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