overall feedback node

Similar Questions

• Feedback node initializer ignored?

  Hello

  I have a feedback node sitting in a loop, the number of iterations is determined by a table of entry. The same input array is connected to a terminal of the initializer of the Feedback node.  The delay of feedback node is equal to 3 and still output the node contains only the first value in the array for the first 3 iterations. It is easier to show than describe them.

  

  So I expect the output array to hold the values 3,1,0,0,1,2 and yet it actually contains 3,3,3,0,1,2

  If I have the scalar value 99 wiring to the initializer then I get the EXPECTED 99,99,99,0,1,2

  What Miss me?

  It comes to LabVIEW 2011 for MAC OS X

  To develop the Swatts answer a little more.  You are in fact only during the initialization of the feedback with a single element node because you have the array of automatic indexing in the tunnel of the loop.

  If you powered the table in its entirety in the loop For and the initializer of terminal, the way you would expect it would have worked.

  

• BT 6.1 feedback node?

  I have an old map OR old that I use, it is an ISA PC1200 card, I only got to work with LabView 6.1.  I have a very simple question, and it's driving crazy me.  I have a WHILE loop running action.  In an iteration of the loop, he solves a number.  How can I keep the number of the next iteration of the loop?  In a more recent version of LV, I used a feedback node to do this, but I do not see 6.1.

  It's a simple thing, but I can't find the solution.  In a BASIC program that it would simply be a variable.  Any ideas?

  6.1 there shift registers? Right-click on the left border of the while loop and see if the shift register to add is an option.

  -AK2DM

• How can I programmatically set the delay of a feedback node?

  I'm generating a sine wave using the vi simulate Signal Express. I then use a feedback node to delay the signal of a specific amount. The front displays 2 charts: one of the original signal and another of the delayed signal.

  The problem is that I will determine the amount of delay based Boolean user entry rather than having to set by using the configuration box (the time will be 4000 if the user chooses "real" and 2000 if the user chooses "fake". I do this with a box structure. How can I use the delay printed by the case structure to control the delay of feedback node?

  I'm relatively new to Labview, so maybe there is a better way to reach my goal of using a Feedback node. Any ideas are appreciated!

  Take a look at this response, "Is there a period of dynamic for nodes of z comments?"

• strange behavior of feedback node

  

  Until recently, I discovered the nodes of comments, and I'm trying to use them to control my instrument, so that if I change a setting, comment nodes can see the difference and preforms an entry visa.  There are 5 parameters to control, 1 to select a range in a list and 4 switches (Hi Res, zero, filter, depreciation).

  The problem is that everything works, but the instrument itself is always one step behind the front panel.  That is, I press the switch to Hi Res and nothing happens, then I flip another switch, say the depreciation, and Hi Res then responds.  Then I flip another switch, then depreciation resonds.  The switch controls the correct setting, but it is still behind by a single action.

  Could miss you a stop character on the order you write?  It takes a while for a timeout occurs, or the next command to write, before the unit detects that it must run the previous command is received?

  Suggestion of DKFire to use the event for this structure is a good on.

• Initialize the array, then using a feedback node to replace items

  Hello friends,

  I have a typical problem. I need to store values in a table 1 d with 7 elements. I want to start with a set zero array of items. I then start sending values and indices one by one so that the value is inserted in the table and is stored. My problem is when I start with a zero table, what happens is every time I have send a value that it replaces a zero to the correct index, but does not store this value for the next iteration as the zero table defines the table to zero once again. Changes as well as an item in the table all the time. I won't like that. Once started, I want all my values stored in the corresponding index, unless until a value with the same index overrides. Here is my attempt in jpg format. I tried to insert a table of zero which takes place once in a while loop and then connect the spare in feedback mode Board so that the insertion of elements Dummies happens only once. But I am not able to do. Please help me view inthi

  

  Your image shows that you cannot have a 'next iteration"because there is no point in loop around the code of the replacement array element and the while loop around the table to initialize is useless. You are not clicking on the button "Continuous run" are you? Do not!

  Here's a basic example. You can learn a few basics of LabVIEW by taking some of the tutorials.

  

• 24-bit histogramming (memory issues)

  Hi all

  I'm trying to create a histogram 24 bits of code for a 24-bit ADC. For further processing of these data, I need all of the bins to be stored, i.e. I found that the histogram in the functions palette VI will not work for 24 bits of data, I'm LV 2010 but on 32-bit Windows XP, (with ~ 4 of RAM)

  The histogram vi meets memory problems with my data.

  Even at a more basic level if I try init an empty array with 2 ^ 24 U32 elements (and therefore 16 M elements in the table) each index of the array represents a code adc and is incremented each time it is acquired. When I initialize and start using such a table I get "out of memory". I would have thought that 16 M elements was not a huge group of data and it is not difficult to find of 16 MB of memory contiguous with allocation of 2G of the application by the operating system.

  I was wondering if anyone had a proper of the present explanation or she might suggest a way around this problem.

  Thank you

  dsone1

  I would change one or two things:

  1. As the shift register is not initialized, the memory usage will be low until the first time that the VI is run in the init mode, date to be allocated to run the memory. It is preferable to assign at compile time as in my modification.
  2. I would recommend an initialized overall feedback node, eliminating the while loop. It also provides an initialized array if the user forgets first run init. (the implementation of the same with a shift register would need also the ' premiere' primitive?).
  3. I move the code init before the code of the histogram, which allows to init and calculate a new histogram at the same time.

  Here's a rough draft

  

• feedback for sequences in LV8.2.1 nodes?

  Hello

  I used nodes of feedback with stacked sequences several times in the recent past, but these days, it doesn't seem to work...  I reinstalled some LV components lately, and I wonder if I've demoted from unintentionaly parts of LabView. There's feedback auto nodes into sequences included in LV8.2.1?

  Basically, I need to transfer data of 0 and 1 sequence in a stacked sequence sequence. I used to connect simply and a feedback node appears automatically. Now it gives me just a cut wire and complaints about the creation of a cycle. I tried to add the node of feedback manually, but it does not accept it. The 'Help' explains the methods exactly as I'd expect, but it just doesn't work...

  In addition, my older screw with nodes of comments always compile correctly (no error).

  No idea what can happen?  I guess I can use a sequence of flat, but I was really intending to use a sequence stacked to keep the block diagram small and sleek.

  Thank you

  Benoit

  Sequence inhabitants allows you to transfer data from one image to the other. I don't understand how you can use a feedback node. Need your VI or a picture.

  PS Sequence structures of any kind are rarely necessary and the use of a stacked sequence is considered by many to be very bad style. You should consider how to remove the structure of sequence all together and use data streams.

• Sub - VI with nodes of feedback used more than once inside a While loop

  All,

  I have a Subvi is a set of operations and using 3 feedback nodes. I use this Subvi inside a loop While 4 times in total. I noticed all instances used to share the same result in each node for your comments, but I would like to have an individual result of each of them. Is there an easy way to work around this problem? I find ways to avoid this: a) create a different vi for each time the Subvi has been used. (b) use global variables instead of feedback nodes. Is there an easier way to get around this problem?

  ExamplePlease note that the two sub - VI are the same) If on my first Subvi I calculate a maximum value and get 1.29 (then goes to the crux of feedback) on my second slot - VI 1.01 my feedback to the Subvi second node records still get the maximum value or 1.29. (and I want it to be 1.01!)

  Hope, that it is not too complicated, I was scratching my head with that for a while, can't find the "easy" button Thanks in advance.

  -Pop

  IM using 9.0.

  It would be useful to join the code. Anyway, I'm not sure how several knots of comments are supposed to work so I will defer to others to answer that. As far as being able to use separate or instances values if you are using a Subvi, you could mark it as reentrant. In this way, each call to it will behave as it were a copy of the VI and it will have its own memory space. This should include the feedback node. You end up with a single slot - VI and in reality a single node of feedback. If you need pass data between calls that simply data through wire. You can also use a motor of Action to store and retrieve values. An EA is MUCH better than a global variable.

• Branch 2 ports introduced "node of Feedback.

  Hello

  When connecting 2 ports LabVIEW requires Feedback node.

  What could be a reason for this?

  Thank you.

  PS Code is huge, so I put just a fragment

  

  
  

• Node FB: Initialize on first convocation

  Hi all

  Don't know why, but my Initialize on First Call option on some of my comments nodes is disabled.  Can you tell me why?  Thank you!

  Yik

  The feedback node can overall initiallized unless wire you a value to initialize the Terminal.   When wire you the initial value of the other options are enabled.

  Some help is a bit lacking but if you select nodes of comments property page is explained here

• Anyway to save the data in a loop without using shift register or feedback loop

  Hi all

  I've been thinking, is it possible to save data in a loop to the next iteration without the use of a shift register or a feedback loop?

  I need the possibility to reload the data within a loop from a file of lvm, but I want to use the same data until I have load some new.

  The reason why I don't want use the node registry or feedback shift is due to speed, although I don't know if the registry change

  in fact moves all the data of one register to another, or if it is stopped until a change data occur.

  I want to reuse data medium and large (6 measure of strength, pressure 2, 1 flow channels) of about 10 s data in each file with samplingsrate of 2 kHz...

  In my testing program, I have several CPU demanding computations and 3D graphics, so I want just to minimize the CPU loading as much as I can for each part of the

  software...

  I am enclosing a small VI to explain what I mean.

  I have now, I shouldn't use the express VI and I'll change that as well - it's just a proof of concept!

  Hope you guys can help me better understand this shift register...

  Thank you!

  -Tommy

  If the speed is the name of the game, go with the flow (data) and stick to a shift of registers or feedback node.  No data is moved, their job is to do pretty much exactly what you describe.  Any other solution, control/locals/globals will imply a copy of the data, and then you will have problems with speed.

• What to use instead of xy graph?

  Hello

  I am new to the sight of laboratory and have a little problem to display data.

  I want to display the phase versus frequency.

  I want to add a new point to the curve at each iteration and want the old datapoints are always displayed. Overall, it should work as in the example I have attached.

  But it would be nice that whenever I have stop the vi and relaunch that old data is no more.

  So, how can I do this with the xy graph? Is there another way to do? I tried the cards, but I was not able to change the frequency x scale.

  Thanks a lot for your help.

  Did you look at my example?

  You must place the shift in the outermost regions register loop so it initializes only once. FOR loop you still absolutely insane,

  Alternatively, you can also use a feedback node initialized in the world.

• E/s files does not save the items in the table

  I can't save the items in the table. If I quit the program and restart it, the array starts at 0 again. I want it from the value at which it stopped.

  Is this a flaw in the Subvi "Timer A1"?

  Thanks for the help.

  mhaque

  Your feedback nodes are defined overall boot on the first call, as evidenced by the glyphs.  If you are stop and start your program, must be configured to initialize worldwide on the compilation or the load, simply right-click and change the setting.  This should give you the behavior you're looking for, but does not exclude the intrinsic problems with the code.

• several results

  Hi all

  I have a question on how to account for multiple results. Here is my configuration:

  1. I have 2 test
  
  
  2. I would like to report the result of the test 1, test 2 and total of test1 + test2

  Please see my attached VI

  Thanks in advance,

  That would be because you need to start training.

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  The fundamental problem is that there is no element of memory (Feedback node or shift register) to store the data of several [the course

  If you select 'Test 1' default data for 'Test 2' (a ZERO) came out of the first structure of matter.  Conversely if you select 'Test 2 '.

  A pair of nodes of feedback wired through the structure of the case are required to "Remember" the last value of test.

  Somethimg like this works much better

  

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