Error-50400 occurred to the Invoke method: FIFO. Read in Host.vi

Hey there,

We have sensors on an engine which are connected to a Board of Directors OR cRIO 9014 (with a NI9411 6 digital input modul channels) and from there, via the network to a host computer.

cRIO jury: the jury cRIO collects data from the engine and stores in a buffer, it's because the network is to slow for the size of the data

Host: bed of the host computer in the network buffer on the map of cRIO, on the host computer, it takes specific portions of the data to create charts of the engine pressure

Error:

Error-50400 occurred to the Invoke method: FIFO. Read in Host.vi

Possible reasons:
The transfer did not complete in the time-out or the specified number of retries.

This error occurs in the following scenario:

-motor is running

-cRIO is running

When I press the Start button (boolean 3) in the host.VI to start reading the data of the card AFTER I pressed the button to run the host VI.

The error will not occur if I pressed the button start (3-Boolean) BEFORE I pressed the button to run the host VI.

We tried to increase the timeout, but it still does not work, the error occurs!

We would be really happy if you could look over it and help us in this case! If you need more information or if we need to clarify a specific part, please let us know!

We have included the VI in the attachment!

Thanks in advance!

CHRISSE,

There are a few things wrong in your application, if I can offer a few suggestions.

First of all, your loops are not running in parallel.  In fact, they are in while loops with a real constant wired for them. I don't know if this is normal for debugging, or on accident.  I would put the question (read pulling elements Dummies) out of your hand while loop.

Your second nested while that the loop (that of the poll the number of items and then shooting them) will execute only once and can make only a few samples.  I don't think that that's what you're looking for here, and there are two ways we can go here.  You might question continually until you have 0 items available for x time, then you know that you have no more available samples and you can process all the data, OR you can put your computer through this loop and always just write in the file immediately in the form x samples are drawn.

In addition, the stop of the main loop condition is ( <= 3)="" therefore,="" it="" will="" run="" once="" and="" then="" stop. ="" maybe="" you="" mean="">= 3?

In addition, you have "add to the file" disabled on your writing to the worksheet, so whenever you write that you are overwriting the old data.  If you want to write constantly, you will lose data.  This can be cured in this affecting true (requiring a new name for file or programmatically removing the old worksheet each time that you run the vi) OR you can recover all your data in a shift register and only write to the file once you have all your available data.

The error you see is because you try to close your FPGA reference twice.  Simply close it once.

After seeing your overview, I think this can be cured by simply reading wiring to get your 1440 X 4 items, but as we have seen, this does not work.  Something happens in your system... that's what I want you do... just run the following... code and let me know how much remaining elements it gives you... Once the number remains (I hope for this, and your engine continue to function), press stop, and all values will be presented on a graph for you.  My broken wires are because I do not have the FPGA VI.

Tags: NI Software

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