Timed Structure of the sequence timing error

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• structure of the event within the structure of the case? error or limitation of LabVIEW?

  Hello

  I am trying to reach a structure of the event within a box structure. The event is triggered by a mouse event (mouse down, move to the top).

  This vi tries to simulate behaviour of the device with a sensor, so the mouse triggered the structure of the event, won't be there in real working environment, so I can't remove the structure of the case.

  But as I noticed that if I try to click on the drawing (that my mouse events are triggered with) before activating the Boolean condition of 2D, I can access is no longer the component front (button, leads, etc.).

  They seems to be frozen. But if the case is true before you try click on the 2D drawing area, everything seems to work well.

  Is - this protected by a kind of LabVIEW bug or there is a limitation?

  These are my screws.

  Thank you

  

  Hello Nefertari,

  Use a Standard Architecture.

  I changed the code. I hope now that its fine.

  Please find the code updated the joint.

  LV 2012.

  Kind regards

  Leila

• Value of cluster lost when you leave the structure of the case

  Hi all

  I'm having a problem with a particular VI I'm working. (FYI it's in Labview 8.0)

  The VI is set to run a current source, voltmeter and thermometer, then recording and graph the data in various ways that can be selected by the user.

  Everything seems to work fine except a particular graphic method. When I try to graph current compared to the tension, the current value is lost estates. In a case the current and voltage are combined to form a cluster, and then leave the case structure to be later appended to a table of cluster.

  However, the value of the cluster is lost when the chart is set for the voltage vs. Any other method and it works correctly.

  I can't understand why this is happening as it does not make much sense than other methods of work charts, but this one isn't when it is coded the same exact other than having the different variables.

  I have attached the VI with added indicators showing that the value of cluster is lost once he leaves the box structure. Any help would be appreciated.

  Thank you very much and I apologize for my extremely messy VI.

  -Nathan Cernetic

  You really need to boil this down to something we can run and reproduce the problem.

  Have you tried to break a few relevant connections and rewire? Something is possibly corrupt.

  Besides being a mess, your VI has quite a few glaring errors.

  Let's take a look at the structures at the top right:

  • 90% of the code is the same in all the structures of three cases, so all that needs to be inside the structure is the small part where you built the table 2D. All the rest is outside of the case.
  • The structure of the sequence has no useful function.
  • Why do you need to reverse the table with each iteration of the small loop FOR? Once before the loop would be sufficient. Right?
  • Why you use table built inside the small loop FOR, but no autoindex on the edge of the loop? All you ever get is an array containing exactly one element, no matter how the loop runs. Seems unnecessary! (see below for an alternative image).
  • You wouldn't even need to reverse if you want to use "built the table" instead of "insert into the table at position 0" in the central part.

  

  Other: You constantly hammer all nodes of your property. The only need that will be called when things change. Again, you have far too many cases. For example, in the structure of the case where you are having problems, the same nodes of property exist in all cases. A single instance of the property node belong outside the case and only the string inside each case constants. Whenever the code is the same in all cases a case structure, which code belongs to the outside!

• Newbie needs help on the sequence

  Hello

  I just try to schedule something wih a sequence but it seems that I am quite familiar with the basic things that LabView. I am therefore asking for help.

  I want to do is start the program wait for the button to be pressed, and then turn on the LED for a second and then wait for the button to complete the sequence and execution of the program. Please see the attached VI.

  I discovered that by placing the button outside the while loop not taste it in the loop. But if I place inside how can I sample it in the other loop. Or do I need a totally different approach?

  Thanks for any help

  Martin

  Martin,

  LV is a "data flow programming language". That said, the block diagram reflects the data sources and data sinks and how they are connected.

  A rule of thumb says: a function can run as soon as all the entries are valid values, once it finishes its execution, it will pass the values valid in all its outputs.

  As a result of this sentence, you can get rid of the structure of the sequence.

  You are looking for other buzz words are:

  -machine States (architecture)

  -synchronization of loops

  Have you worked through the LV classes or "getting started"?

  Norbert

• structure of stacked sequence

  OK, so what I try to do is to use LabVIEW 8.0 and a USB-6008 is a photocell allows to start the rotation of a motor continuous when it is in the darkness and stop the motor function once it is exposed to light.  Only after the engine stopped moving I want then to a linear actuator to deploy.  Separately all programs work as it should and I was able to integrate successfully the photocell function and motor.  What I can't do, is get the actuator to deploy once the engine has brought his designated position.

  I was planning on using a structure of stacked sequence so that I make sure the actuator goes off until the engine has completed its task.  Because I need to have the photoresistor and the engine in a while loop to ensure that they are constantly looking for the data telling them what to do, I placed them in the while loop and the motor part of the code in a frame of the stacked sequence.  Once the motor stops, I then passes the data forward to the next section, which is just a Boolean wire coming out then the structure of the sequence in a loop to give the necessary tension to control the actuator.  However, it does not, the engine continues to ork in synchronization with the resistance, but the trigger does not fire.  I wonder if there is something wrong with my attempt to pass off while the structure data.  As I read on stacked sequences, it seems that many people do not use them because they do not work properly in time so I wonder if there is a way to avoid using one but to make sure that the actuator will not draw unless the resistance has guided the motor in position.

  I have attached the code to help the understanding of the program.

  I use a bridge allowing movement front and rear H, you will see a 3 x 1 matrix in the structure of the case.

  Thank you!

  Hi Leanne,

  You could use a digital logic to check for a change in value, and the value itself.  In the example below, I did this with a feedback node that stores the value of the digital line of the previous loop iteration:

• Structure of the event in timed loop

  Quick question on the structures of timed loops\event

  What is a good or a bad idea to use structures of event call loops - as opposed to while loops. ?  I guess I like the idea of call loops - because you can prioritize them - so if there are some important things you need priority of 100% in the background - but for the user interface, you can configure it to run slower\or run to a different priority level.

  I just wanted to check it is not a reason why I shouldn't do that - since all the examples don't do that.

  JP

  I don't think it's a good idea. Your timed loop can stop waiting for an event. There is no advantage of placing the structure of the event in a timed loop. It is possible to assign priorities to other objects outside of the call loops. For example, you can the priorities given to subVIs. I'm reasonably sure that the structure of the event can work at other priorities if you do not the activities of the user interface. Maybe someone of NOR can confirm this.

  But the goal of a timed loop is to have a deterministic periodic job. The structure of the event must be used for asynchronous events. The two disagree with them if they are in the same spot.

• Structure of the timed real-time event loop does not work

  I'm a new user for LabVIEW. And I've encountered a problem that frastre really me! Hope someone can help out me. Thanks in advance!

  I just want to use the structure of the event under timed loop, which is important in my extrmely design.

  However, this works very well in my computer (without connecting to the FPGA).

  Once I connect it to the FPGA, then I can still run but there is no response!

  My file is attached. Please someone help me!

  Looking forward to your answers!

  The FPGA runs headless. Structures of the event won't work. What you need to do is to have an application on your host computer when the user presses a button, changes a value, etc.. This event should send a message via TCP/IP for code that runs in real-time environment. Then the real time environment should attribute to the desired value a control on the FPGA.

  As a general rule, programming real-time with FPGA has several layers.

  (1) host-> handles interactions with the user code and communicates the code in real-time via TCP, UDP, etc.. Displays the user sent by RT controller data.

  (2) code in real-time-> tracks headlessly. Manages host code messages, processes the data of FPGA, communicates with FPGA much as the host code communicates with the code in real-time

  (3) FPGA-> no acquistion and passes through PEP in the RT

  The first thing you need to do is to understand the architecture and how all these pieces of the puzzle work together before you throw things down on a diagram.

• problems with timing in a time loop in a structure of the event

  Hello

  I'm using labview to control three motors stepper, running the three stages of different translation in different axes (X, Y and Z). Please see the attached VI, focusing on the structure of the event on the RIGHT side.

  In the Z axis, I am trying to run the engine for 5 seconds, after clicking on a button. I have attampted to do by adding a sub of elapsed time VI within a while loop, located in the tab 'Mouse before Z down' the structure of the event. A similar "elapsed time while loop" is also included in tab 'Z reverse the mouse down' the structure of the event.

  Separately these "elapsed time loops" work very well, BUT when I run a Z direction after another, say 'Z Reverse' and then 'Before Z' then they annoyingly interact. The calendar is gone, with the moment where we add, rather than rebooting.

  No idea how I can reset the time elapsed while loops? Or is there another method better do?

  Thank you very much

  Charlie

  charlieryan wrote:

  I take a wire from the 'i' of the while loop at the entrance of the Sub autoreset - VI of tiem will blink?

  No, connect you to the "reset", not "autoreset".

  

• timing in the structure of the case

  His clear, I have a push button, when triggered, it should green light (which occurs, no problem), but when triggered, it should turn off the led immediately, (which doesn't happen), how do you?

  Try "Structure of the event" to react on events.

• How to set up independent HDMI/SDI framebuffer options of timing in the sequence?

  Hello

  I have a tricky this time... One of my monitors to external customer review (large TV) hurt because there is microstutter in the videoplayback if I'm out 25 p signals.

  50 p signals are working properly.

  Determination may for example have a 25 p timeline and view it as a signal of 50 p on the outside. Is there a possibillity that also inside the first?

  Same thing for 24 p signals - micro stuttering kills the smooth video playback - 60i with remove pulldown works very well... So I need just a way of saying the first: Please present this external native 24 p sequence as a 60i signal...

  Any idea?

  Premiere Pro is designed to transmit the signal "like what", based on the specifications of the sequence.  The only way to do what you want is to use a sequence of 50 p.  (Or 30i, if necessary).

  You can also get a better TV, one that will show 24 fps to 96 Hz, for example.  (Repeat each image four times to eliminate the flicker caused by 24 Hz refresh.)

• Violation of compilation-Timing error FPGA

  Hi all

  I've been LV around for years, but I am a complete newbie when it comes to FPGA. I'm working on programming for a 9651 (SOM) using the Dev kit. I'm starting by small steps, but already tripped. I have a simple VI which retrieves a value from a FIFO and passes it réécrirait a different FIFO. When compiling, it gives an error of timing violation, and I don't know how to study. The VI is attached.

  If background for the curious... I'm working on the side of our application to signal processing. I'm passing data from a prerecorded TDMS file to a FIFO. I want to send the FPGA, treat it and send it back. Eventually, it will come of I/O, but for now, I just want to work on the processing of the signal. Before starting work, I thought I'd just make sure I can transfer data to the bottom and back. Once I get this job, I'll start to developing processing screw for between the two.

  Thank you!

  Hi thutch79,

  You can specify the version of LabVIEW you use and implementing CLIP half bridge that you use for the IO DevKit?

  It was a timing violation introduced between LabVIEW 2014 and 2015, given the way the compiler Xilinx handled VHDL which takes in charge the second port Ethernet on SOM.  If you use a CLIP half bridge that has been generated before 2015 LabVIEW (as the example of the expedition which I think begins with a CLIP called "DevKit"), then you can get a timing error.  There should be a second sample CLIP called DevKit2, I think, which was regenerated with compatibility for 2015 of LabVIEW and later versions.

  This problem has been discussed here: https://decibel.ni.com/content/thread/42711

  You can check your half-bridge CLIP in the project by ensuring that you have selected the version called DevKit2 if you have a version of LabVIEW FPGA which is 2015 or newer.

  Kind regards

• major error with the structure of the event

  IM under LABVIEW 13.0 PRO

  I don't know when this strarted bug happening, but now when I add a business to a structure of the event. Freezes in LabVIEW. I have to close labview with the Task Manager.

  It doesn't matter what code I'm working with, even a new VI, with nothing else than a structure of the event.

  I tried this on my desktop PC, my laptop and my CPU DAQ.

  The error occurs on my desktop and my laptop. But it does not occur on my CPU DAQ.

  Whenever I click on add event usually case, you get a popup to configure and add cases, but with the popup error never comes to the top and labview crashes.

  Theres no code to share the problem ocured when adding events to the event structure. It happened with any structure of the event, in any code, all the time.

  I spoke to an engineer of apllication of labview and suggested to delete the labview.ini file located in the installation of labview directory. I did this and the problem was solved.

  Still not sure what caused this to happen.

• Enum (type def) - structure of the case called update error

  Hello

  1. One of my (type def) enums is not updated the names of structure cases. I found something that looks like a probable error in the case where the structure,
  2. I had created one of the constants in the enumeration before I did a typedef. Therefore, I made new constants since the typedef and replace the original ones. and still, the structure of the case is not being updated.

  How can I solve this?

  also, I have one state machine inside the other. Is this right way to program?

  

  Somewhere in your code, you have the wrong typedef, or don't replace a control by the typedef. Must not have replaced all. I don't know if there is an easy way to search for; You may need to go through anyway.

• DBAdapter retains the unique causing value sequence force error

  Hi gurus BPEL.

  I am facing a problem in EBS integration of the invoice of the OTM.
  AP invoice header is inserted, the AP invoice lines does not get inserted due to the below error in BPEL. Import of payment fails, as there are no invoice lines.

  
  Anomaly of the non-recoverable system:
  Exception occurred when the link was invoked. Exception occurred during invocation of the JCA binding: "JCA binding run reference"insert"operations have to: DBWriteInteractionSpec Execute Failed Exception." insertion failed. The descriptor name: [APInvoice.ApInvoicesInterface]. Caused by java.sql.BatchUpdateException: ORA-00001: unique constraint (AP. AP_INVOICE_LINES_INTERFACE_U1) violated. Check the logs for the record output full DBAdapter before this exception. This exception is considered non reproducible, probably due to an error of modeling. To be classified as reproducible rather add property nonRetriableErrorCodes with the value "-1" for the deployment descriptor (i.e. weblogic - RA.Xml). Auto retry a reproducible fault set composite.xml for this invoke these properties: jca.retry.interval, jca.retry.count and jca.retry.backoff. All properties are integers. ". The called JCA adapter threw an exception of resource. Please review the error message above carefully to determine a resolution.

  
  SOA DB Connections seem to retain the sequence used in the cache and assign the same when the Bill for the line is inserted. This causes the Unique constraint error when inserting the table of AP invoice lines in EBS.

  I call the standard APInvoices.wsdl to make the insertion AP_INVOICE_LINES_INTERFACE. I noticed that in the file APInvoice - or - mappings.xml contains the following code
  > the sequence name < AP_INVOICE_LINES_INTERFACE_S < / sequence-name >
  < table sequence-field = "AP_INVOICE_LINES_INTERFACE" name = "INVOICE_LINE_ID" / >
  < / sequencing >
  < cache >
  weak-reference < cache-type > < / type of cache >
  <-cache size >-1 < / cache size >
  true < always refresh > - < / always refresh >
  < / cache >
  < remote caching >
  weak-reference < cache-type > < / type of cache >
  <-cache size >-1 < / cache size >
  < / remote caching >

  Is their anything I can change something in the BPEL process to refresh the cache of the sequence all the time.

  Alternative, I think now is below.
  1. check with customer if they can do the sequence AP_INVOICE_LINES_INTERFACE_S as NOCACHE.
  2. pull the invoice line via pl/sql adapter and complete the invoice line. But in this case, I'm not sure if Web APInvoice service code will try to update with the generated BPEL sequence.

  Any direction on this issue will be of great help.

  Thank you
  Shobz

  Hi Anushal,
  Thanks for the reply.

  Hi all
  The problem has been resolved with the creation of this «sequencePreallocationSize» DBAdpater
  As this property is set to 50 DB adapter's default, it did not fit with the INCREMENT BY the AP_INVOICE_LINES_INTERFACE_S sequence that has been set to 1.

  What happens in the adaptor DB is, when the first record is created, it takes the nextval in the sequence (assume it is 20), however it uses then his own sequence internal for the next 50 files by reference to the value set in this property (by creating records with primary keys from 20 to 70) and only when this internal sequence is exhausted it will return to the sequence of database.
  Meanwhile, any other inovoice created AP would recover DB, which could be his word to say value 21, in conflict with the inserted by BPEL, throw a unique constraint.

  Setting this property to 1 or corresponding increment sequence solved the problem.

  Thank you
  Shobz

• Switch timer within the structure of the case?

  Hello

  I am relatively new to LabVIEW, hoping someone can help me with something that I am trying to solve. I am working on a system for the acquisition of data for a formula SAE car and try to design a VI that will be time how long it takes for the car complete the trial of acceleration of 75 m. The timer will be actvated in now the pedal for 5 seconds and save time for the file when 75 m is complete.

  I've set up a business structure that works in the following order.

  1: Check the brake pressure (if threshold, go to 2)

  2: how long the brake was pressed for time. (If more than 5 seconds switch to 3. If the brake is provided within this period, date back to 1)

  3 whether the movement of the wheel (wheel strats move, go to 4, otherwise, keep control)

  4. begin to measure speed and distance. (once reached, proceed to 5)

  5. replace all over again, save the file (then return to 1)

  I'm pretty happy with everything but part 2. I tried a timer pending within a sequence of flat, check that the pressure is fine, but pedal pulses rather that now he can active it, and using a true/false with the same function case structure waiting does not like LabVIEW bed not true/false value, once within the structure of the case.

  I would be grateful if someone could point me in the right direction!

  Thank you

  Kevin

  get rid of the sequence, here your timer elapsed, also got rid of your case to check brake pressure, do not use ms of waiting for your timing of sequence...