Schedule iteration five FOR lines inside a timed loop...

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• While loop inside a timed loop

  Hello world!
  I use:
  -LV 7.1 + real-time;
  -compactFieldpoint;

  When I put some time, I noticed a strange behavior, loop inside a timed loop.  Let's fix loop timed with these settings:

  -Clock 1 kHz
  -1 ms period (Yes, I know it's short...)
  -offset 0 ms
  -Stage 0
  -Take the period of absence (ON) and maintain initial Phase (ON);
  -Timeout:-1.

  So, inside the loo, I put a traditional while loop, waiting (for example) an event will occur, and if this event doesn't happen, my cFP-2020 crashes! I mean, it becomes inaccessible for the debugger, and also, if I run a ping at his address, after a few cycles it becomes inaccessible as ping!

  Obviously, that statement of code lock the fieldPoint, because if I remove the inside while loop all work.

  I know that with 1ms duration, timed loop always the finishing of the delay, but I put the scrapping period missed and timeout-1.
    
  It seems to me that sometimes timed loop add overload heavi programs, I all so that the loop according to the tasks, even if my application has be in real-time!

  Tips welcome! Good day!

  Graziano

  Thank you very much for your answer!
  I'll test the entire application and then look for the best practice... but I still think I'll replace it timed with while loops loops...

  Good day!

  Graziano

• Sequence structure flat inside the timed loop and execution order

  I have some problems trying to implement a flat sequence structure when you use a loop timed on a target of cRio VI

  I tried with or without the while loop around the structure of sequence flat, and I also tried to replace the 'Non-deterministic loop' with a timed loop

  The problem is that the program seems to run only once, then get stuck somewhere

  I am writing a program that performs the following operations as soon as possible:
  1. read the Pos_MC of entry on the FPGA
  2 send the value of Pos_MC to the VI target (on cRio CPU)
  3. calculate a value of output based on Pos_MC with a PID block ("exit PID')
  4. send 'PID output' to the FPGA
  5 write "PID output" analog output "MOOG".

  In addition, I want the program to return the measured value "Pos_MC" to a host VI for the recording of data

  So that the output of PID is calculated and sent to the FPGA as quickly as possible, I placed a flat sequence structure to ensure that it happens before you send the output to the nondeterministic loop for recording data

  Also, I want the digital input 'Stop' to be able to stop the loop deterministic (the timed loop)

  I read much more entries than that and the help of several PID and exit, but I rewrote the code for a single entry and exit to make it easier to illustrate

  Screenshot of the code is shown in 'target code.png' and 'fpga code.png.

  The VI themselves are attached in the next post (cannot attach files of more than 3)

  Question 1:
  Any advice on how to get this race? Thank you!

  Question 2:
  Is also my correct understanding in that, using this structure, each 0.9ms (fpga loop time) comes the following:
  1. the input ("Pos_MOOG") is read on the fpga
  2. the production of PID is calculated on the cRio with some delay to computation (for example 0.1ms)
  3. the output of PID is then written for analog output "MOOG" in all about 0, 1 - 0.2ms
  4. the FPGA program then waits until 0.9ms spent and repeat the process

  As opposed to the next pass whenever performing a loop is started on the FPGA:

  1. the FPGA reads the input and written on the output (the output of the execution of the previous loop PID)

  2. then the entry is sent the cRio, PID output is calculated and sent to the FPGA

  3. the new release of PID is maintained until the next time through the loop

  Thank you!

  PHG wrote:

  Thanks for the input guys, any advice as to how I could get the feature in scenario 1?

  I still say that the best route is just putting all the logic of the control in the FPGA.

  Other alternatives include 1) the use of DMA FIFO sedn data back or 2) use interruptions so that the FPGA code can not read the output level until the RT.

  DMA FIFOs are usually very limited, and I would not use them in this situation since I belive said it this code to do for the many outputs.

• run inside once timed loop

  I have a timed loop that monitors the equipment. Whenever there is an error I send a notification by e-mail. My problem is how to stop send e-mail whenever the time loop is executed. I tried placing email it inside a loop, but quickly realized that the whole of the loop itself is reiterted. Any help is much appreiciated.

  You can also consider using the first call? under the range of synchronization primitive.

• Using an attribute editable ice for lines inside an editable of ice for the link attribute

  When I have something like this:

  < has the ice: editable = "link" href = "/ home" >

  < div ice: editable 'line' = > any content < / div >

  < /a >

  ... My client sees only the option to change the link.

  Is there a work around it?

  Thanks in advance,

  Diego

  Nesting of tags of ice is a no-go. Mark the editable item as link and line :

      bar
  

• How to put a line inside the foreach loop number

  Hello
  
  I work in a nutshell, model, and I have a foreach loop. For each row of data, I would like to put a line at the beginning of the line number, i.e., 1,2,3,4, etc.
  
  How can I do this in Word?
  
  Thank you

  use

• Impossible to click on the buttons for the timed loop.

  Hello!

  I have a loop that is timed with a pace set by the user. And when the loop is running, I can't push any button of my GUI to stop it...

  I have to wait until a mistake or I stop the race.

  I can't put the diagram is too big and I think I don't have the right, but you have ideas?

  Ask me for more details.

  Thank you

  bejard wrote: timed loop is just in a structure of the event and I put 10 ms or 100ms.

  The program runs correctly (with this loop delay of 10ms/100 ms) like in the beginning, but I can't push any button or even change the tabs during the loop.

  You shouldn't have long extensions inside the event.  Which is supposed to stop your timed loop?

  I think that you have the option "Lock the front until the end of the occurrence" lit.  It will not press anything, until the end of everything for this case (including the timed loop).

  According to my experience, using a loop timed in a Windows system is a complete waste and often adds more overhead and questions.  Instead, I really think you need to use a State Machine.  When the button is pressed, you tell your state machine to move to the State the code inside your timed loop tracks.  You can use the State with the structure of the event to time your loop.  If you can go behind your state of event to your processing loop structure.  Just set the timeout on the structure of the event at any rate of loop you really want to.

• passing the value and to timed loop

  Hello everyone,

  I'm working on a VI that consists of a timed loop which takes values in a file every 6 ms and writes it to an output file. Inside this timed loop, there is also a MATLAB block that calculates a parameter based on the value. based on this parameter, that a marker is set to 0 or 1 (planned) to operate as a Boolean marker.

  The problem arises when the marker is set to 1. I need an additional structure any that waits five seconds (without stopping the timed loop iterations) and a 'stop' button is not pressed an additional string is placed in the output file. I wish for the marker to get back to 0 if you press the 'stop' button and not string to put in the file.

  The main problem seems to be the use of a structure outside the timed loop. I can't have a while loop or any structure that waits 5 seconds inside the timed loop. And if I let him out he does not have the value of the marker second structure during execution of the timed loop.

  + Any ideas on what the structure to be used during the 5 seconds Timeout? (I tried a while loop)
  + Use a local or global variable for the marker? (I tried briefly, but as a local variable, I couldn't choose a variable defined in the MATLAB block, and I don't understand global variables in LabVIEW)

  I enclose a simplified version of the VI as well as a sample input file in case it can help visualize.

  Thank you
  DAVA

  So far, there are a few problems with your solution, but first of all, I will try to help answer your original question.

  You are right that you can't have a structure inside the timed loop which waits five seconds without blocking execution of the timed for the same period. You are also right that you cannot simply communicate through cables to an external structure. If you exit a loop of wire in the other, which creates a dependency of data flow, which means that the data loop cannot run at all until another loop ends its execution entirely and send data.

  You have two options:

  • Don't actually use a wait function to determine if the 5 seconds elapsed. Use the Express VI of time elapsed (search the palette). He just guard track of how much time has passed since the last reset. It does not wait. If you are safe to use inside your loop timed in a case that is triggered when the marker value becomes 1. Also check the Boolean command in this case Structure to decide if you should output the data in the file.
  • Use an outer loop as in the example you posted, but use screws of the range of synchronization to send data between the parallel loop. Consider a queue.

  But overall, I don't think there is much chance of this work very well. No way, the Matlab Script node running fast enough to run at a time of 6ms. Also no way it works in a deterministic way at all. He needs to communicate with an external program, so its execution time is really unlimited.

• Create a table in a loop 'for' (reset the number of loops)

  Hello

  I try to incorporate a signal of acceleration from an analog input CRIO to get speed and then further integrate to get the moving of a vibration system.

  I understand that to achieve integration, a table must be fed in. My problem is that I could not buffer the signal in a buffer block, as I couldn't find buffer blocks. so I decided to create my data table by using a loop "for". The nests of the loop 'for' inside a timed loop. The problem that I'm stuck on is how to reset the loop 'for' in order to fill the buffer with each iteration of the outer loop timed.

  I enclose the code if that helps. Note that I use labview in 2013.

  If anyone who has encountered a similar problem before can help me, I would be gratefull.

  Concerning

  Ali

  You can use a shift register initialized as inputs to your curls, to build your table of one. However, you realize, don't you, that the execution of your program as written loops as soon as the computer can spit out responses, then the output array may contain several points that took place before the entry has updated? Assuming that your thing cRIO (I've not worked with these) has integrated into its routine acquisition of calendar data, I suggest you put that inside the loop to get a data point by reading.

  And do you really want your graph to distance for update only every thousand points (points of acceleration million) speed?

  Cameron

• How to force a new period of a timed loop?

  Hello.

  Here my question:

  I need to modify programmatically the period of a timed loop. This isn't a problem but:

  I have to wait until the next loop to present new period value. For example if my previous period was 20 minutes, now I have to wait 20 minutes in order to submit a new period.

  This beacause the code to change the period should be inside the timed loop itself. You can see what I mean in the picture as an attachment.

  

  The Subvi Gets the new period of a console operator. It will run until the end of the period previously configured.

  My question is: is it possible to force the timed loop to get the new value without waiting for the execution of the previous period?

  Thank you

  FPIA

  Hi fpia.

  Sometimes, it would be more useful to 1200 seconds instead of 20 minutes

  It was suggested many times before: rather than wait for a long time with just a single call to a wait function you should divide this amount of time into smaller pieces!

  -Why do not use you a period of time for example 5 and only count the iterations to know when 20 minutes are more?

  -Why don't you use the function "Time" to know when to exceed the 20 minutes?

• Timed loop versus While loop

  Most of the machine control software I design have the following structure:

  1. There's a HAND that takes place inside a TIMED LOOP with synchronization of 50ms and priority of 100. His only job is to read / write data from / to DAQMx IO cards.

  2. the MAJOR can call several SUBs based on the choice of the user, and once a submarine is called FP MAIN is closed and the FP SUB opens. All submarines have a States Queued Machine running within a TIMED LOOP with 50ms timing but with priority to 50.

  3. data transfer between HAND / SUB is through function globals - there are many of them based on past data.

  4. all woks fine so far. No need to any RTOS. and platform of WIN7 is alomost standard. I even ran with a timing of 20ms without anything crashing...

  Problem: When there are a lot of file i/o operations in a SUB partciluar, then I have the chance to see several missed iterations. Perhaps the TIMED LOOP is hogging resources.

  What I want to do: convert both TIMED in asnd SUB HAND loops simple while loops.  But I am concerned by the priority - since the MAIN interacts with HW there priority. But with LOOP WHILE how can I ensure this?

  Or is there any replacement / effective way of doing what I do now?

  Rama wrote:

  .... FGV should be thrown out the window...

  Well used for a while, based on many articles in the KB. One of them is locked... and it does not represent the engine of the Action or of the FGV as a villain to avoid.

  The driving force is one of the largest buildings in LabVIEW.  The FGV who does nothing but Get and Set (or writing and reading) is useless and a waste of resources.  Why?  It does nothing to fix possible race conditions (does not protect critical sections) and it is much slower than just using a global variable.  See this example I put in place to see what I mean: an overview of the race Conditions.

  Rama wrote:

  So in the sample that I had attached, what do you think would happen if I just replaced the two loops with the SAME timed in MAIN and SUB wait value ms. is there a work order then?

  When things are at the same time, there is no such thing as the order of execution.  But as I said, it seems that your loop is quite slow, so it's something I would not worry.  Just make sure that you do not have a loop that uses all the CPU.

• If you select value of LOV gets this oracle.jbo.InvalidOperException: No. JBO-34014 no child node found for line with key:oracle.jbo.Key when inserting line

  I use JDev 12 c on Windows 7 Pro

  I do a CreateInsert in ADF button on af:table. The model is set up so that T1 is one to many with t2, t2 is one to many with t3.

  I have recordings in t1 and t2, and trying to insert a record into t3.

  After I click the button, two of the three PK columns have values of t2. The third column is served by LOV. I open the LOV and select a value, and I get this exception:

  oracle.jbo.InvalidOperException: Houston-34014: no child node not found for line with key:oracle.jbo.Key [79449 Xnnnn-nn-X-nnnn null] under parent node: root

  at oracle.jbo.uicli.binding.JUCtrlHierBinding.bringNodeToRangeKeyPath(JUCtrlHierBinding.java:875)

  at oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding.bringNodeToRangeKeyPath(FacesCtrlHierBinding.java:121)

  at oracle.adfinternal.view.faces.model.binding.RowDataManager.setRowKey(RowDataManager.java:131)

  to oracle.adfinternal.view.faces.model.binding.FacesCtrlHierBinding$ FacesModel.setRowKey (FacesCtrlHierBinding.java:951)

  at org.apache.myfaces.trinidad.component.UIXCollection.setRowKey(UIXCollection.java:553)

  at org.apache.myfaces.trinidad.component.UIXTable.setRowKey(UIXTable.java:768)

  at org.apache.myfaces.trinidad.component.UIXCollection.broadcast(UIXCollection.java:188)

  more of the stack trace was stopped for brevity.

  I've seen other posts related to this exception but no solid answers. I tried a few suggestions but nothing worked.

  If I remove the 3rd key I can insert a line, but on the second row, I get an error indicating that the primary key violation. It's like the page checks the constraints of the entity before the validation.

  Insert in this table works fine in the tester model.

  Thank you

  Dave

  And by LOV you mean: af:inputListOfValues?

  It usually works within the af: table if you VO with composite key.

  Maybe you can set ChangeEventPolicy = none on your iterator, but it will probably not help.

  Dario

• I created my worksheet for line in alternation but number colors keep alternating as I had stored it. What Miss me?

  I have the latest version of OS X and numbers. I followed the instructions for line alternating colors but numbers using just the color or shade that was in the previous row. I'm puzzled!

  Select the table, then select all of the cells, then open cell formatter and make sure that the filling is not activate.  Look at the lower right of each of the screenshots.

  Cell fill color, White value, then no other line if on same shading in Table formatter:

  

  Fill color set to "No fill" of cells, shading line replacement is now visible:

• Edge counting and Source of Timing for timed loop on the request for Acquisition of data - not acquiring data on specified rising edge

  Operating system: Windows XP

  Hardware: PCI 6259

  Terminals used: PFI0 and PFI2

  Counters used: Ctr0 and Ctr1

  IM developing an application for the acquisition of data where timed loop synchronization source comes from my PFI2 (using the string A of an encoder).  IM basically trying to acquire data based on the number of ticks from my encoder.  For the synchronization source, I use counter 1 to capture the rising edge and have the loop time-acquisition of data.  At the same time, Im using the counter 0 to count the number of rising edges so I know exactly in what tick data was acquired.  PFI0 and PFI2 are connect to channel A of the encoder.

  Questions:

  Timed loop acquires data at each tick, because when I discover the data (text) file is missing count of my encoder value.  Is it because there is a limitation on the Windows operating system?  I used a noculars to measure the frequency at the maximum rotation of the channel encoder and 6,757 kHz.  All solutions?

  Also, is there anyway I can route the source channel internally an encoder to generate synchronization source instead of using another counter?  I have attached my VI.

  Hello

  All the samples that you acquire will be read by LabVIEW in a sequential manner. Figure 4-21 on the M-series on page 80 (4-34) shows that you will acquire all the samples you request all channels that you enjoy in sequentially.

• While why broken arrow will not appear for a timed loop

  Hi all

  I need a little clarification relative to normal while loop and timed looping in labview.

  In labview, if I keep a while loop on a block diagram, broken arrow will appear in the upper left corner of the window indicating the error. It displays error because I have not wired conditional terminal of the while loop.

  But same is not the case for a timed loop. Can someone tell me what is the reason behind this...

  If I release the conditional terminal of the timed while loop, it runs in infinfite time like a normal while loop. Then y labview behaves differently for these two types of loops in the scenario above.

  FYI... I'm using labview 2009.

  Waiting for response.

  Thank you

  Herald

  Ruben,

  the reason is quite simple: call loops are mostly real-time and FPGA targets. Since most of the applications on these targets work continuously (at least this is more often the task), it is possible to create a loop that does not end. So the timed loop by default assumes that there is no need of a stop button.

  The 'normal' while loop needs code for termination (conditional terminal) because normal applications on Windows/Linux/Mac are used to be fair...

  hope this helps,

  Norbert