Feedback node initializer ignored?

Similar Questions

• 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?"

• 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.

  

• 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.

• overall feedback node

  Were they just a passing fad? I have stopped using years ago because I heard they had performance problems. But I've also heard that they were not fully implemented properly and NEITHER would remedy.

  

  

• Maxon motor control with LabView

  Hello everyone, I'm new here and I tried to find out how this process of work for some time and I ran out of options. LabView is very difficult to understand.

  I'm about to order a controller epos Maxon motor 24/5. I have a vi that does what I do, but I need to find a way to make the process faster. Basically will control a wing that goes forward and backward at very high speeds. I'm not sure what I should do, I would also like to generalize the process by a power enter a function or a wave of the position of my choice. If any of you all can help me it will be greatly appreciated. Thanks in advance.

  CarlosUT,

  Without the subVIs Epos, it is difficult to say where downturns could be.

  Take into account:

  1. the mathscript node is probably much slower than native LabVIEW, special code for what looks like a logic very simple.  Replace with the range of comparison functions.  Also consider the feedback node initialization so that you know where it starts when the VI is called.

  2. learn a few basics of data flow. Your delay (ms) and judgment is read only once at the beginning of the VI and these original values are passed to the loop. Any subsequent changes to these values will not see inside the loop. Move the terminals in the loop.

  3. double code: you have the same Subvi in each case in the structure of the case. Move the Subvi outside the structure of the case and simply use the box structure to choose which set of values will be used.

  4. given that the minimum value of the delay (ms) is 150, the loop cannot run more than about 6 times per second.  You don't specify what you mean by high speeds for the control of the wing, but this may be a factor.

  Lynn

• How to free the memory after the end VI

  The data is collected once in a loop and added to a table of data. The collection was completed after the loop ends and a data table was built. In the end, the data has been written to a file. The program ended naturally. I guess that all the variables are erased from memory after the end, but it wasn't. If I run the program twice without closing, I have a set of newly collected data added to the 'old', which was created in my last run. A third series has been added if I run it once more.

  I just want to keep the last function as my data and I don't want to close the program to set all my settings to similar races. How to do?

  A sample file is attached.

  Thank you.

  You need to wire a constant empty table to the Terminal (lower bound) of the feedback node initializer.

• 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

• 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

  

  
  

• How re - initialize an array with the new values at run time?

  Hello

  In this application of particluar I want to change the value of a particular index (Ex: 4th move in a 1 d table) and store the changed value (Inremented) in the same index position.

  I wrote a program, can someone tell what I am doing wrong?

  LabVIEW version: 8.6

  Screenshot kindly updated instead of .vi

  Two things.

  First of all:

  You must initialize the table (via the feedback loop).

  Click with the right button on the wire of the array and create constant.  Move the index of item 99.  Initialize element 0.  This thread up to the lower part of the feedback node.

  Second:

  You use an Insert in the table VI, but it's not describe what you try to do.  While he places an element in the position shown is also increases the size of the table.

  This change to a subset of table replace VI.

• How can I initialize a spelling?

  I have a program for the HP4192A.

  The program can draw XY, but the next plot will be based on the previous ones. So I have to close the program to delete the graphic.

  How can I add a button or switch to initialize the graph, so I don't have to close the program.

  Thank you very much.

  I cleaned the diagram on the EIS VI test.  It is easier to see what's happening this way.

  Comments on the program:

  1. do not the two wires on the connector a for a loop and connect a table via a terminal autoindexing.  Who has the smallest value will determine the number of times that the loop iterates.

  2. it is generally not a good practice to use the table build inside a loop, because it can cause frequent memory reallocations.  Best practice is to initialize the array to the maximum size, it will reach outside the loop and use replace a subset of table inside the loop.

  3 there is nothing wrong with the mixture of nodes and feedback shift registers in a loop, but this can be confusing someone watching the program later as to why. I prefer the register shift, but it's at least partly because I used LV long before that the crux of the feedback has been introduced.

  4. the high passage registry ends up with the same data that the table introduced in the loop of the sequence constructor screw is there a reason why you take it apart and back together again?  Similarly, it is not necessary use table of Index with the Index Entry linked to i, especially since you already got the same table autoindexing.

  5. I consider amending the measure VI HP4192 more far: eliminate feedback nodes and graphs because you perform these functions in the main VI.

  6 use the Negate, rather than multiply by-1.

  I can't save in version 7.1, so I've attached a picture of the block diagram with many of these changes.

  Lynn

• initialize the control to the new default value

  Hi all

  I would like to initlize a control to a new default value? I was looking into property nodes and node of appeal, I can use call node initialization by default, but how to change the value by default in the block diagram? is it still possible?

  Best regards

  so I just read this

  http://forums.NI.com/T5/LabVIEW/make-current-value-default/m-p/777099/highlight/true#M355585

  so I'm asssuming * ini is the way to go