Master/slave event Structure vs. State Machine
First some background to the question (skip this paragraph if you are simply interested in the question). I'm relatively new to Labview, after only a few months of coding with Labview and LabVIEW Core 1. Being one of the only people in the company who now knows Labview I have been challenged with the creation of a relatively complex application that will perform a selected ten or to view different tests with customizable options, display, analyze and deliver and automate reports.
For the application I am writing I need a GUI with several screens (I achieve with tabs), initially I tried this code with the structures of the event within a machine to States (but as you probably know this was fundamentally flawed, that you can't put structures of the event within the structures of the case) (, or structures of the event), but from here, I spent several hours of searching the best alternatives.
So my Question is: would recommend to use a master-slave (with the structure of the event and the State of computer, respectively), or simply use to continually voting machine status?
(Keep in mind I'm going to use this as part of a larger facility of producer/consumer.)
Thanks in advance,
I use a case in my state machine specifically for checking to GUI events. It is usually a "Idle" State or a specific State to 'check events. I can also set the time-out programmatically by using a register shift, just in case I need to do a quick check (some small timeout) or wait for a user to press a button (timeout is - 1).
Tags: NI Software
I have a state machine with a sort of stand-by, where a user can select the next button state. I tried using a structure of the event with changing the values to select the next case, but when the state machine is in a specific case and the button of another State on the blocks of all things. I've attached an example, the lights simply stating that you are in the State.
Thx for your time,
Edit: actually, I miss-clicked
1. you have not need a while loop around the structure of your event. With no wired time-out, you will never get a timeout event.
2. your button events are set to 'Lock Front Panel until end of the event'. Uncheck the box which.
I don't know exactly what you're asking, but it sounds as if you want a bunch of script tests and if the user says stop, to immediately stop the current test and abandon others? I'll assume you know how to clear the table so that it will not abandon the others, so I guess that you have wrong to abandon the current test? If it is indeed the case, the problem is that you are not able to spread the message of the VI FP main which is the GUI for the sub vi which is the test where the test may or not have a GUI (FP visible) of its own. Threading is the first thing to come to mind, but it will be may not need the use of events.
You can do this by passing a refnum of the stop button to the Subvi, where you can then add to wait to the structure of business event.
I have attached 2 screws, mainvi.vi which is just a loop displays the number * 2 (number of seconds since the race) to be called subvi.vi and then check to see if the button is pressed. mainvi.VI is in no way a state engine, it's just a simple loop for demonstration purposes. subvi.VI just waits 2 seconds and leaves, this is a better engine State structured with an init State to start a case of survey to wait events and an exit status to clean. You can change everything as you wish so that he can do what you want. You will notice that even if subvi.vi is running, it will automatically end when you press the stop button.
I hope this helps.
I have a problem when I want to set up an event in my state machine.
The state machine is reading communication series through different States 10 +.
The problem came when I tried to add an event inside the State number 10. In the number of State 9 code seems to work only partially (an option button is not possible to change the value on).
It seems almost that it is frozen but when I select the code I can see it works well (option button isn't).
It is strange that when I remove the event in condition 10 all is well again? The event code is not yet performed yet because it is in the frame after!
I'm under LabView 2013 on a Windows 7 PC.
I'm trying to figure out which of the two cases is the one who seems to hang if the name would be better than a number.
When using am event structure you don't we want to use a local variable. In fact, you should only use local variables on rare occasions that they break the flow of data. The event structure is fine for the entry. The problem is the way you treat things after that the button is pressed. Again, I think you have to look at a design model of producer/consumer with a machine of the State in queue.
The best way to have a writing occur only after a button must have the code for writing in a case that is active when the button is true and is simply empty, when it has the value false.
Is there a problem using more then one While loop with an internal structure of the event, in a single VI?
In my (only a partially attached printscreen) VI there is more then 2 all in curls with a structure internal even who controls a different devices.
Event structures are being controlled by a box structure.
From time to time the VI gets stuck and resetting local variables.
Using two while the loop is not a problem, it depends on how you structure the code.
Generally, we use two while loop for Producure-consumer, master - slave structure type of applications. Try to use the structure of State machine inside while loops, see standard state machine examples in the palette of NOR find example.
Version: Labview 2012
I have an event within a state machine structure. I want to use the State to choose each drive a motor by defined parameters, State of the 'ok' button or via the signal by a State to "pay input" of the knob, there is also a timeout State.
The expiration time and OK button States work properly, input state for does not work. I enclose a copy of my complete code, although it may not be easy to follow, and also pictures of the States.
I took the initial a sample code. In the example of that input state to pay has been fuelled by a dial, I changed it be motivated by the input value to pay. I think that the motor does not move it is because the State of entry for does not (using the probe) but I can't work on how to make it run. When you use a dial I think that the use of the dial executed somehow the State. I may be wrong in my assumption that the executing State is the problem.
Any help or advice on how to get this to work would be appreciated.
For an entry is an indicator, it will not trigger a value change event. Instead of connecting the new value of the indicator to connect to a node property set to 'value (signaling)', this triggers the event to change the value.
Here's the scenario.
I use the buttons controlled by the user in an event structure to control a state machine. Currently, I have a different State for each button. However, 4 or 5 of these buttons could ideally correspond to the State, which is what I would like to get... Each of these 4 or 5 buttons causes flow data and the results are stored in a table, but listened data are different for each button! Therefore, if each of those 4 or 5 buttons caused the same condition occur how I could decipher what button was pushed? Ideally, I would have 4 or 5 different paintings once all the buttons are out of the same State.
Is there anyway that I can achieve this?
Hi the shots.
you have access to the refnum of the element inside the event. With the Ref, you can simply get the name or any other property of the control to distinguish them.
Hi, I'm developing an application in which the user actions will initiate certain events. I've implemented the application as an event-driven state machine. However, I realized that one of the events must launch a continuous process, i.e. reading from the buffer of a USB device. It seems that the master/slave model apply. Is it possible to implement the model master/slave with slave event triggered activity? I have the feeling of these two designs are incompatible.
If I interpret your concern of a straight line, "I thought that a part of the particular event should run completely before any action of the user would trigger another event...» » :
An event Structure maintains a queue of unmanaged manifestations. When any event registered to a Structure of the event is triggered, LabVIEW places the event in this case queue Structure (you can have multiple records for the same event and LabVIEW will be provided with a copy of the event in each record... a bit more advanced, but it happens more often with user events, since normally you should not have more Structures for a single VI event). When the Structure of the event is called, it will be the next event unmanaged dequeue and execute the corresponding diagram. If there is no event in its queue, then he will wait. If none of the events occur (are added to the queue) at the time where the period has elapsed, while the diagram of time-out is executed.
Which means, the schema associated with a certain event needs to be completed before all other diagrams can possibly run; However, events such as buttons on the user interface, are still captured during execution of the first scheme.
If your diagrams of Structure of the event have long-running code, then you can go out with that have be your only design. For example, the operations find and initialize in your sound image as an attachment as things just happen once and back relatively quickly, so the button find out the slave device will probably expect you - a slave is discovered, and then initialized by pressing the key, after which your VI is ready to run several diagrams of the event. However, if one of your States running really persistent operations, such as a schema "" run slave"where you have a collection of persistent data loop, then you will be in trouble since the schema will not end and your UI will probably become numb.
What does not work is if persistent operations are ran asynchronously. If your slave has something like a "Start ANT Slave.vi" that starts an asynchronous process slave for you then returns, similar to how I would expect the "Init ANT Slave.vi" to behave, then that would work.
What RavensFan and crossrulz have mentioned are ways to achieve this in your design (rather than in the design of the class ANT slave). Say that your ANT class slave doesn't have any internal asynchronous substance put in place that you can just start, and you will perform all operations running on your block diagram yourself. In this case, you can create a new parallel to your course while loop. A form any synchronization mechanism, such as a notifier, could be acquired and transmitted to two loops. Run the loop of the slave could simply wait on the front warning system it does nothing. Then in an event run in the upper loop for push button start, for example, you have to send a notifier, stating, "Okay loop slave, please start". The slave will begin its operations and continue to execute, while your event in the first loop schema would end, and you would still have a user interface responsive.
The design pattern of messages in queue manager is where you have a queue instead of the notifier used in the example above, and you can messages from queue you want the slave to receive (and apparently act accordingly). Loop of the slave and then check the queue to see if his master has sent something - if so, it performs this action; If this isn't the case, then it executes any action that it deems appropriate.
I am trying to find the best way to stop a program that consists of an architecture of State machine in line waiting for event with several parallel loops. Can anyone recommend the best way to achieve this in my attached VI? (To browse the forum, this seems to be a frequently asked question, but I have not found a solution that works for me.)
I look forward to any comments on my as well code, if someone is willing to offer it.
My program needs:
If the user press the 'Stop' button, the program should prompt the user with "are you sure you want to stop the program?" and then return to a State of rest or move forward to stop the program. In addition if there is an error, the program should prompt the user to ' clear the error and continue, or stop the program. Then back to the idle state or move forward to stop the program.
The program consists of 3 parallel loops: (1) a loop of event management that places different States of a queue of the State, (2) a State Machine that enters the State that is removed from the queue of the State and (3) a loop error/Shutdown, which deals with errors in the error queue management.
During normal shutdown, where running handling loop in the case of event 'Program.Shutdown' and 'Shutdown' and the 'Idle' States are added to the queue of the State. In the state machine, the State of 'Stop' is invoked. Special "5000" error code is added to the queue of the error. In the loop of error handling and stopping, "5000" error triggered a prompt that asks the user if they want to stop the program. If the user chooses not to stop, a notifier StopNotif is sent to the State of 'Stop' and 'Program.Shutdown' event case with notification 'Go '. If the user decides to stop, the Notifier sends the notification "Stop". Loop and event management State Machine ends when they receive the notification "Stop".
In case of error, the program behaves in the same way: If the user chooses to clear the error and continue, the program returns to the status "pending".
HOWEVER - if the user chooses to stop the program, the program crashes. The author of the notification that is sent to stop the loop of events and State Machine management cannot be read because event Program.Shutdown and the stop State (which contain the function "Waiting to notify") are not active.
I was able to activate the stop State by Queuing in the loop of error/Shutdown management. But I don't know how to activate the "Program.Shutdown" event by program and thus access the function "Waiting to notify" inside.
I tried to put the function "Waiting to notify" outside the structure of the event, so the event-handling loop never ends. Placing timeouts on the "wait for declaring" and the structure of the event makes the programme of work, but I want to avoid using timeouts because I don't want to turn my event program into a program of polling stations. I would also avoid using variables or nodes property to stop loops, because that requires the creation of a control/indicator for something that the user does not need to interact with.
First of all, close the notifier outside loops with your queues. Second, you must use a user event to send the message to the event structure loop so that it stop in the case of the stop on an error.
Hello, I wonder if someone can help me with something. I have a sequence, followed by the event structure / while loop.
someone can help me. I want to create a STATE MACHINE.
Here's a basic outline of the current structure, I. and this is what I want it to be. I wonder if its possible and how.
I'm using labview 7.0.
This is what I want?
I looked at your Executive VI. I don't have an easy way to save in LV 7 now so I'll try to describe in words how I would approach this mess.
I think it can be done with two loops, a structure of the event, a case structure and not global or local variables. In fact, there is probably some small business structures and lines inside some of the case, but nothing like as layers of ~ 12 nesting, you're struggling now.
Look at the design model of producer/consumer (events) as a starting point.
The loop of producer (event loop) will have the structure of the event. It will be a case for each control that requires immediate action. Those that I could identify: get telemetry, side, open Journal printing, abandon, press tank Mode (?) Temp tank (?), Scan, Stop, wait, Step (?) unique, continue and Execute. Most of the buttons must be set on the mechanical action of locking and placed terminals in the case of the event appropriate. So no local population is necessary to reset them. Those with (?) have no event. You can have a case of timeout to display Date and time, eliminating which (painful to my eyes) loop. I don't know about the other stuff in the case of a timeout, but most likely, it is up to the other loop. If the room 1, 2,... buttons change during trips, they may also need event. Inside of each event is exactly one element: the Enqueue function. Create an enum command and make it a typedef. Enqueue this enum value. The queue will be read in the loop of consumer where all the action happens.
The consumer is your state machine. It has a Dequeue function to get a new order for the structure of the event. It has several shift registers to transfer data from one case to the other. These removes your global and local variables. I'd shift for each of the following registers: the State (typedef enum), cluster of error, temperature (table), pressure (table), results (table), Stat results (table grapes) and a big cluster Indicators_Flags (typedef). The cluster Indicators_Flags everything that is in the cluster you initialize in the black image sequence (and then never reuse) would have more all indicators except the berries in Maj separate records as well as all your globals and no status indicator, you might need.
The structure of matter is the heart of the state machine. All shift registers through it. It will be the case for what the program does. Everything in this black initialization setting in about 15 cases of Init. The while loop to the right of the boot image goes away, but the case inside to become some of the cases of the state machine. Chassis temperature cycling code goes into 1-3 cases. Mode code pump and read the pressure of your case of timeout event are 1-3 cases. Code of telemetry: 2 cases. Print the Page before: 1 case. Excel code. Abandonment of code. Temperature and pressure cycling code of main program: 5-20 cases. Graphics, record in file: more cases. Break: 1-2 cases.
I would like to make a list on paper anyway, you think that you may need and allows to create a typedef enum to control cases. By making a typedef, it is easy to change without running all over the code looking for the constant in all cases of change. Enum names will appear on the structure of matter as strings. Create the loop, shift registers and the structure of the case. Moving is part of both the original thread can duplicate the case until you have a case for each value in the enumeration of the State. (Do not use the case of the mark for each value option because it will empty cases that you will then need to wire through.)
Then copy code from various places in your existing code in the case in the new VI. Try to avoid copying inhabitants that it will create new controls. Name bundle to get data in and out of the big bend cluster registry and use ungroup by name. This provides a free documentation of the data used.
Check in a month when you have other problems. This will not be a quick fix. But it will be useful to have a program that works and is easy to manage.
I wrote a small example queue state machine to try to teach myself about the creation and use of the user events. The purpose of the machine is periodically pick a number (I do now with a control instead of a generator of random numbers for troubleshooting), and compare this figure with the number I put in a control. When they match, I want to raise an event to fire so I can do something about having found a match. The examples in the file LV references help show events within the structure of the event, but I want to reach out of a State and trigger an event...
Can someone point me in the right direction here?
I think the service you're looking for is generating the user event. What to put in your consumer loop, inside the case structure when identical numbers.
Good day everyone.
I'm having a problem with the flow of data between the structures of the case.
I try to use an example of a state machine for this simple problem. but when I try to send data of a box structure to change the State of the code. It will change not in the desirable output, instead, it offers the possibility that the exit options emul.
could someone please point what I'm doing wrong here. Any kind of help would be very appreciated.
With a quick glance at your photos a question you have is that you use not data flow. You write your status updated in local variables value. Your State should pass through the case structures are a single wire. Playback of your order "Enum", happened in the register shift on the right side of your loop probably get running and reading before any processing occurs within the structure of your business. That's why you're reading the old value of the State and not the update. or have a classic case of a race condition in your code.
I have a question on how to achieve the "Timeout". In the diagram below, you can see 2 different situation:
1. in the 1st case, I used the state machine, it starts in State 1, that contains a case of event. From there, it will first be determined, if the input value has changed in 10 seconds, if it didn't, the state machine will go to State 2, if it is changed, will also be determined, if the value equal to 3, if so, input the distributor of State will in State 3, if not, go back to the State 1. (this VI I've done it before, you can take a look at the attachment).
2. my question is in the 2nd case. He also started the State 1. Here, the input value can also be changed (once or several times) or not. If the value has not changed within 10 s, or even if it's been changed many times within 10 seconds, but it was never equal to 3, the state machine will go to State 2. only when the value of the entry within 10 seconds equal to 3, he can jump to State 3.
This problem, I do not know how to solve, everyone has no idea or improve methods?
Thank you very much!!
My bad, dint tested before posting (in addition to kills confidence)...!
Let me know, if it works this time...!
I'm trying to create a program using the state machine which include events genreated user to jump between States. Also, I want the program to require a sequence of events to be genreted before entering in some States.
States: Init, idle, a-1, A-2, A-3, B - 1 and stop
If a-1 State is selected, the user must enter the setting and select the condition A-2.
The user cannot directly jump without having to access the mode a-1 to A - 2
If the user selects the a-1 State, he should have the possibility of not input parameter and jump to another State as B-1 or Stop
State A-3 can be entered automatically by State A-2.
How to program the machine in order to do what I want? I've updated a sampling program. I'm not sure if I impleted the program properly. The user Panel hangs if I enter State a-1, and then press the Stop button. It does not allow me to leave the a-1 State and forces me to go to State A-2.
A few other questions:
-How to initialize all values of boleean to 0 during my Init State?
-Why is a timeout value?
Hey there, I developed example of Jacobson on a bit here to illustrate the case "Idle, how far to walk, ' your state machine diagram.
Some keys on the front panel when you are in the bad condition will do nothing, as you can see, because I only check for buttons, I would like to respond to each State. For example, by pressing "Start on" the State of market won't do anything because this isn't a valid button, but pressing "Quit" will bring you to Idle. To implement the rest of the state machine, it is up to you!
I have NEITHER cDaq-9188 and its modules NI 9214 (thermocouple), NI 9203 (HAVE current) and NI 9263 (AO tension). I need to measure the temperature and pressure, and according to these data, I need a frequency converter to drive a compressor control. I've developed acquisition, analysis and recording program by the use of the state machine, the design of producer/consumer model and I have no doubt about their. They all work very well. Now, I need to add a control program in their. The problem is that I need to check the compressor with feedback from temperature data permanently, but I do not necessarily all the data acquired and permanently from the results of the analyses. For example, I need to record data once in 30 seconds. Which model desing should I use for this task?
Edit: I was not able to find examples of advanced program relevant to the design of master-slave model. If you know where to find them, could you write in this thread please?
The declarant buffer not data. Do only the queues. A new notification replaces the old value if she is ever read or not. You would be loss of data with the notifiers if the loop of consumers with a notification utility cannot keep up with the data that they fade.
What I show all the data buffers through the queue in the loop of the producer. The queue of the consumer removes all data and do stuff with him (such as logging) if the elapsed time is over. What is the problem with that? That is what for (imstuck) described in his message.
The other alternative is that you put the timer into the loop of the producer. Have the Boolean value TimehasElapsed drive a deal structure this place only the data if the time is over. In this case, only some data gets queued, and consumer loop removes all data as it gets and it opens a session.
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