Other events interfere with abort for state machine started by an event
In the attached VI there is a state machine that is triggered by a boolean “start” change event. There is also a boolean “stop” that stop the state machine, a numeric “voltage” that has an event handler and a boolean “exit” that has an event handler.
The stop button works as expected unless if the voltage value is changed before the stop button is pressed. I was thinking this might be because there is an event for the voltage value change but there is also an event for the exit button value change and the problem does not occur if the exit button is pressed before stop.
If anyone could explain the reason I am only running into the problem with the voltage value change and/or how to properly implement the stop/abort function I would appreciate it!
Thanks,
Dave (LabVIEW 7.1)
Well that certainly solves the problem I was having! The case in a while in a case in a while reminds me of the 10-level deep if statements I used to end up when starting C programming. I guess the inner case/while are required for the state machine and the outer while is required for the Producer / Consumer. I always find myself thinking in terms of "if/then" statements and the case/comparison took the place of that.
Regardless, problem solved. If anyone has tips on how to make it (attached) look better, please post them!
Lynn, I wasn't quite sure about your instructions on passing the exit and stop commands through the queue. I went with the idea of keeping the long-running loop separate. I know I still have a bit more to work out such as use of exit button while state machine is running, and the stop button only works in between state machine iterations.
Message Edited by davey31415 on 11-27-2006 07:04 PM
Attachments:
PowerfoldMeasStat.vi 158 KB
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Hi everyone,
Well I'm still trying to do a car slideshow using external
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http://www.virtuallglab.com/projects.html
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import mx.transitions.*;
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The entire for loop will execute (if possible, and it doesn't
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variable, effectively overwriting the value so you will never be
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Best method for state machine design for multi-dimensional clustered data
I have an application that is collecting analog tag data(1000 points) and displaying on a graph. In each vi, I may collect data for as many as 32 channels, but only one channel at a time. Usually this is collected in numeric order, but maybe not all the time. I am also saving an "expected profile" to a file for each channel. I display both expected and actual data on the graph and select which channel to view with a ring control. My question is about how to design the state machine for best memory usage/execution speed/... If I use a shift register with a cluster datatype, that holds both 1000 point arrays, some statistical data like max/min/pass/fail/test limits for 32 channels, won't all of the u
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s you are using, you could increase the amount of memory usage required by Citadel and the tag engine, but if you are needing to write your cluster data to the database, then there is not much you can do about it. Ultimately it sounds like a pretty involved application and will require a fair amount of memory regardless to ensure smooth functionality.
In general, questions about the LabVIEW architecture and memory management are typically better answered if they are posted to the general LabVIEW discussion forum area. But I hope that this has addressed some of your concerns. Have a good day.
Patrick R. -
How to create state diagram (for state machine)
Hallo all.
In my previous visit here, i saw picture of state diagram (bubbles with connection),
How to create that in labview (if there is such option) ?
or, which other software create state diagram.
thanksThere is the State Diagram Toolkit (additional tool from NI for LabVIEW) with good interface and unreadable code
It gives you a State Diagram Editor at Functions palette.
It is very good tool for state diagram visualization, but readability of the code is controversial.
When you will get a clear picture of a diagram from State Diagram Editor, I suggest use classic state diagram pattern: case structure driven by typedef enum in while loop.
Regards
Mikrobi (Zbigniew St. Sobków)____________________________________________________________
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Finding the minimum with a for statement
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Hello,
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How to use a event structure with a state machine
First, I would like to inform you that I only work on LabView part time, and have much to learn. Anything I do learn, I usually forget until I need it again, because I only work on it part time.
Using your StopWhileLoopMOD[1].vi, I am trying to put a state machine inside the event structure.
Related link: http://forums.ni.com/t5/LabVIEW/How-to-stop-while-loop-in-Event-case/td-p/465564/page/2
Here is my application: on the front panel, the user can select any combination of 7 different tests. I have created cases to perform each step of each test in the correct order, but if the user presses stop, the tests won't stop because some of the cases have a while loop inside the event structure (like you mentioned is a bad idea). The user should be able to stop the test, reselect tests to perform, and re-start the tests.
When the start button is pressed for the event structure, I need all the cases to run in the proper order, unless stop is pressed.
In the past I have indexed an array and used that to run the state machine, but it won't stop immediately.
I have sub VIs that are built in while loops because the outputs of the product needs time to stabilize. The state machine stops and waits up to a certain number of iterations. If it passes the test, the while loop stops and the next state starts. If it takes too long, it exits and reports an error. Maybe I need to just use the state machine and not an event structure?
Is there a good example of an event structure?
metzler CLAD
Solved!
Go to Solution.I'm not sure exactly what you are asking, but it sounds like you want to script a bunch of tests and if the user says stop, to immediately stop the current test and abandon the others? I'm going to assume that you know how to clear the array so that it will abandon the others, so I'm guessing that you are having trouble abandoning the current test? If this is indeed the case, then the problem is that you are not able to propagate the message from the main VI FP which is the GUI to the sub vi which is the test, where the test may or may not have a GUI (FP visible) of it's own. Threading was the first thing to come to mind, but this may not be necessary using events.
You can do this by passing a refnum of the stop button to the subVI, where you can then add that wait to the event case structure.
I've attached 2 VIs, mainvi.vi which is just a loop displays the count*2 (number of seconds passed since running) that will call subvi.vi and then check to see if the stop button is pressed. mainvi.vi is by no means a state engine, it is just a simple loop for demonstration purposes. subvi.vi just waits 2 seconds and leaves, it is a better structured state engine with an init state to start a poll case to wait for events and an exit state to clean up. You can modify this any way you wish to get it to do what you want. You will note that even if subvi.vi is being executed, it will terminate immediately when the stop button is pressed.
Hope this helps.
A
Attachments:
mainvi.vi 17 KB
subvi.vi 33 KB -
I currently have a large house wide wireless network and I am using a dedicated Buffalo HD with USB for time machine. The HD has gone bad and can't be repaired. I am thinking of replacing it with a Time Capsule. Will this fit in with my current routers etc, render them redundent ? I THOUGHT THAT THE HD I BOUGHT WAS OF GOOD QUAILTY BUT IT HAS BROKEN AFTER 2 YEARS. HOW LONG CAN ONE HOPE FOR A TIME CAPSULE TO LIVE (USING QUALITY SURGE DEVICES ETC) ? Does one need to backup the backups?
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I know I should have redundant backups and should probably have a second external HD and eventually will.
Yes, that's best.
But for now, if I partition (I'm assuming I should) a new 1 TB external HD, how big should I make the TM partition vs. the SD partition at this point assuming I have under 100 GB on my internal Mac HD? Is this a feasible way of doing things here in the near term.
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i have developed the State machine workflow in which i am using default workflow task
i have added one status dropdown and that is having approve or reject that i set using workflow task drop down values
now my requirement is that when my workflow goes to different approval i need to have different status values in dropdown
for example
on manager approval state activity i need to add additional status value forward to legal
but when it moved to next activity this task status field should show only approve and reject
in summary i need to have different status values for workflow task when it moved to different state activity(approval levels)
can we set these status field of task for state machine workflow programtically as well like for different approval level of task i need different status to be set for the dropdown of task status field
MCTS,ITILHi Shahid Siddique,
I have seen a similar thread from you about this issue, create custom form for the seperate form is a considerable workaround, you can have a check whether it works.
http://social.technet.microsoft.com/Forums/en-US/9baa0c32-1cde-4c58-aa7c-3568ccf0cdc9/different-approval-level-of-task-i-need-different-status-to-be-set-for-the-dropdown-of-task-status?forum=sharepointdevelopmentprevious
Thanks,
Qiao Wei
TechNet Community Support -
How to update task status from custom task in state machine workflow
i m using custom task for state machine workflow
i am using
if(this.onTaskChangedSupervisorAction_AfterProperties.ExtendedProperties["Workflowstatus"].ToString().Contains("Approved"))
if above is true moving forward its working fine but i want to update the status field of task as i can update the title and due date for the task but how can i change the status once approved it
should show the status as approved it's only showing in progress
this.CreateTaskSupervisorAction_TaskProperties.Title="supervisor task"
MCTS,ITILIf your task shows In Progress state then I think you need to look at your workflow and make sure you are using Complete Task activity and if you are already using Complete Task Activity then verify the Correlation ID. Ideally you are not required to set
this value in workflow. You simply use the Complete Task Activity.
If you are running into issue where your workflow is staying in In Progress state even after the task is complete then you can look at the following blog post.
How to programmatically complete Approval workflow task
Amit -
Dear Fellow LabVIEW programmers:
Most of the systems you deal with are reactive. It means that their
primary function is constant interaction with their environment by
sending and receiving events. But most likely, they can have something
happening inside them too, even when they are not processing messages
received from outside. So, such systems have to continuosly react to
external and internal stimuli. Right? Moreover, most likely, they
consist of subsystems that are reactive too and, in turn, can have
their own "life", to an extent independent from other parts (with
which they still communicate, of course). Reactive (event-driven)
systems are more naturally modeled with active objects. So, why then
should we try to model and code them with GOOP and its passive
("dead"!) objects?
"Flat" State Machines have been known for decades to have severe
limitations. It's been more than 20 years since Dr. Harel invented
Hierarchical State Machines (statecharts) to fight those limitations.
Then why does NI still tout the same old good Moore FSM as the
ultimate tool for event-driven programming in LabVIEW in its $995
State Diagram KIt?
The LabHSM toolkit we are happy to present, makes it possible to
easily create and then maintain complex event-driven applications in
LabVIEW as a collection of HSM-driven active object VIs using a higher
level of abstraction and agile software development methodologies.
These active object VIs are created based on a universal Hierarchical
State Machine ( HSM or statechart ) template. So. all your code looks
similar regardless of its functionality!
We all love just jump to code, right? However, to be good boys, we
need to do design first. Then implement it in code. If the logic is
modified we need to redo the design first and then redo the code. When
using LabHSM where behavior information is abstracted into a separate
HSM data file editable with a supplied editor, there is no need for
coding separate from design any more. The modified behavior becomes
code automatically as soon as the HSM file is saved. Design is code!
The implementation basically follows Dr. Samek's Quantum Programming
paradigm. (see http://www.quantum-leaps.com). However, as already
mentioned, LabHSM stores the behavior information in a file separate
from the code itself. It also adds state dependent priorities to
events, a separate queue for public events/messages, and, of course,
some LabVIEW specific code like capturing front panel user events and
putting them into the private Events queue. Communication and
instantiation functions are also rather specific for LabVIEW.
It is available for UNLIMITED PERIOD trial. Please visit
http://www.labhsm.com for details and download. The site also contains
references which you may want to check to learn more about
hierarchical state machines and active object computing.
Since this is our debut we will appreciate any comments and
suggestions. Our contact information is available on our site, of
course.
Have a G'day!Symtx is currently hiring the following position. Please contact me if interested.
Amy Cable
Symtx, HR
[email protected]
Symtx, the leading supplier of functional test equipment, hires the brightest & most talented engineering professionals to design & manufacture complex custom electronic systems for advanced technology leaders in the defense, aerospace, communications, medical, transportation & semiconductor industries. Symtx’ challenging & dynamic work environment seeks to fill openings with highly qualified electronic engineering design professionals.The ideal candidate will be responsible for defining the requirements, software design and code development, and integration of test control software for custom functional test systems. Candidate should be familiar with data acquisition concepts, instrument control, complex test, measurement and calibration algorithm development and definition and implementation of control interfaces to hardware. Prefer familiarity with instrument control via GPIB, VXI, MXI, RS-232 desirable. Requires BS/MSEE and 3 -7+ yrs of experience in one or several of the following test applications in a Windows NT/2000/XP environment using Labwindows CVI, TestStand, Labview, Visual Basic, C++ and knowledge of RF systems is a plus. Job responsibilities will include software design, development, integration, team leadership, and interfacing with customers( includes PDR’s & CDR’s). -
Shutting down a queued event state machine with multiple parallel loops
I am trying to find the best way to shutdown a program that consists of a queued event state machine architecture with multiple parallel loops. Can anyone recommend the best way to accomplish this in my attached VI? (From browsing the forum, this seems to be a common question but I haven't found a solution that works for me.)
I welcome any other feedback on my code as well, if anyone is willing to offer it.
My Program Requirements:
If the user presses the "Shutdown" button, the program should prompt the user with "Are you sure you want to stop the program?" and then either return to the Idle state or proceed to stop the program. Additionally if there is an error, the program should prompt the user with "Clear error and continue, or Stop program?" Then either return to the Idle State or proceed to stop the program.
Details of architecture:
The program consists of 3 parallel loops: (1) an Event Handling loop that enqueues various States to a State Queue, (2) a State Machine which enters the latest state that is dequeued from the State Queue, and (3) an Error/Shutdown handling loop which processes any errors in the Error queue.
During normal Shutdown, in the Event Handling loop the "Program.Shutdown" event case executes, and the States "Shutdown" and "Idle" are added to the State Queue. In the State Machine, the "Shutdown" state is invoked. A special error code "5000" is added to the Error Queue. In the Error/Shutdown handling loop, the "5000" error triggers 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 "Shutdown" state and "Program.Shutdown" event case with the notification "Go". If the user chooses to stop, the notifier sends the notification "Stop". The Event handling loop and State Machine are terminated if they receive the notification "Stop".
In case of error, the program behaves similarly: if the user chooses to clear the error and continue, the program returns to the "Idle" state.
HOWEVER - if the user chooses to stop the program, the program stalls. The notifier that is sent to stop the Event Handling Loop and State Machine cannot be read because the Program.Shutdown event case and the Shutdown state (which contain the "Wait for Notifier" function) are not active.
I have been able to activate the Shutdown state by enqueuing it in the Error/Shutdown handling loop. But I don't know how to activate the "Program.Shutdown" event programmatically, and thereby access the "Wait for Notifier" function inside it.
I tried to place the "Wait for Notifier" function outside the event structure, but then the Event Handling loop never completes. Placing timeouts on the "Wait for Notifier" and on the Event structure makes the program work, but I want to avoid using timeouts because I don't want to turn my event-driven program into a polling-based program. I'd also like to avoid using variables or property nodes to stop the loops, because that requires creating a control/indicator for something that the user doesnt need to interact with.
Thank you!
Solved!
Go to Solution.
Attachments:
Queued event state machine parallel loops empty.vi 46 KBThanks for clarifying that, Ravens Fan.
I marked crossrulz as the solution for pointing out User Events to me.
I also adopted Ravens Fan's suggestion to keep the Shutdown procedure out of the Error Handling Loop. This has simplified the architecture by eliminating the need for Notifiers. Instead, I have used booleans in case structures to stop the Event Loop and State Machine, and Release Queue to stop the Error Handling Loop.
For reference, I'm attaching my corrected code.
Thank you to everyone who helped!
Attachments:
Queued event state machine parallel loops empty in progress.vi 44 KB -
Need help with basic user events in Queued state machine example
I have written a little queued state machine example to try to teach myself about creating and using user events. The objective of the machine is to periodically choose a number (I'm doing it now with a control instead of a random number generator for troubleshooting), and compare that number with the number I have set in a control. When they match, I want to cause an event to fire so I can do something about having found a match. The examples in the LV Help file references show the events within the event structure, but I want to reach out of a state and cause an event ....
Can someone point me in the right direction here?
Thanks
Hummer1
Solved!
Go to Solution.
Attachments:
User Event Generator Example01 snip.png 102 KBYep....That was it...I had tried to do that but got fouled up with the variant definition...so defined the user event using a boolian and did the same in the case structure where I wanted to create the event and it worked great...
Thanks.
Here is the final version...not bulletproof, but does have a queued state machine using a user event to cause an event to fire.
Hope you find it useful.
Hummer1
Attachments:
User Event Generator Example01.vi 45 KB
Operating States Enum Example01.ctl 5 KB
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