State machine for text-based instrument control

Hello,
I am trying to control a text-based instrument to set various parameters and turn modes on and off.
My main question is about the four case structures on the far right of controller.vi. I need something that will write the command to visa (just once) after a button click. The way I've done it is obviously not ideal.. I'd like to be able to have a boolean (or preferably a radio control) controlling RC mode on/off and common mode on/off. As far as I can tell, the way that sort of thing is *supposed* to be done is with an event structure, but I've only got the base package. Radiobuttonstatemachine.vi is my first attempt at trying to make a state machine for this purpose. But it just runs once and then quits, or while it's running it hangs everything else up.
Currently the VI only works in continous mode-- I'm pretty sure that's one of my biggest problems-- no? What is the correct way to make an event structure without an event structure?
Best regards,
Anna
PS. Apologies in advance-- I know this is probably really obvious but all of the questions and tutorials I can find do this kind of thing with an event structure, which I can't use. I'm an undergraduate doing an internship and this is my first time using labview (basically my first time with any programming) so ANY ANY help would be be very appreciated.. Also any comments on my coding since I don't know anyone that's good at labview and can point out improvements to me. THANKS AGAIN.
Attachments:
controller.llb ‏513 KB
radiobuttonstatemachine.vi ‏14 KB

There are a few things to remember with LabVIEW. The reason your program only works in continous mode is that LabVIEW is a dataflow language, it executes the objects as their inputs are satisfied, then their results travel to the next "node". In your original program the messages to the instrument are in "nodes" that are all "serially" connected, so that unless you run it in continuous mode there is no loop back to the beginning to read any changes. When you start the program in the non-continuous mode it will read all the front panel settings almost instantly, "flow" to the message sending nodes and then end.
Can you get the full package? User interfaces are much easier to design with "events", but remember thoise were only added a few major releases ago, you just have to be trickier.
Here is a quick modification to your radio buttons.
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion
Attachments:
example 9-29-08.vi ‏15 KB

Similar Messages

Ideas for text based budget management and software

I'm looking for suggestions for text-based software or just basic scripts for tracking expenses.
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Not to copy Price from PR to PO for text based purchases

Hello Experts,
We have a scenario, in which the PO will be created using a load file (LSMW - BAPI) with reference to a Purchase Requisition. All are text based purchases and no material master exists. I want the price from the load file to be taken as priority but no the requisition price.
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Thank you in advance
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Hi
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ITSMobile for Text-based devices

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Need help with Math functions for text-based calculator!!!

I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. Basically i got the easy part done. Also I am using the case to do the funtions but I am not sure if there are symbols on the keyboard that are commonly used for these funtions so i just made some up. I am new to java and this is only my second assignment so any help would be appreciated. Thanks
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rmabrey wrote:
I have the calculator working but I am having trouble figuring out thow to do a square root function, nth factorial, absolute value, and Fibonacci. java.lang.Math.sqrt()
nothing for factorial - write your own.
java.lang.Math.abs()
nothing for Fibonacci - write your own.
%

How do you create array of enums for transitions in a state machine?

Hello,
I am trying to build a state machine, but, I am struggling with understanding the methods for determining which state to transition to next. In other words, I have several states, but, I don't want to go in any particular sequence. If I have states numbered 1 through 10, I want to be able to go 1-4-2-5-6-2-6-1-10 etc. in no particular order. I want the transition to the next state (and actions) to be determined by the streaming data, which can be random and require access to any of my 10 states at any time and in any sequence.
I saw this picture on the "Application Design Patterns: State Machines" white paper, but, it leaves out some important details. How does one create the structure in BLUE shown in 3C? When I try to create this array of enums, all of them are the same. I am not able to make a list of different enum values. In other words, when I type in "2", then, all the values in the array display as "2."
There is a nice, simple video example of a state machine for dispensing soda for $0.15, however, this state machine moves in a single sequence, from 5 cents, to 10 cents to dispense; it does NOT illustrate how to select a state "out of order." I need to understand how a state machine can move from "5 cents" state to dispense directly, with the addition of 10 cents to the "5 cents" state.
Can anyone suggest a really good tutorial on how to make the selector work in a state machine? I have been reading some of the available material on ni.com, but, I can't find a good detailed explanation of how to do it. I remain confused.
Or, can you just explain how they created the BLUE array in the attached picture? Maybe I can figure it out from there.
Thanks,
Dave
Solved!
Go to Solution.
Attachments:
next state.jpg ‏75 KB

Hi Kathryn,
Yes, this is EXACTLY what I want to accomplish...
So it would basically run:
State 1
Read input
Determine next state (say 3)
State 3
Read input
Determine next state
State
Read input
Determine next state
And so on...
But, I am quite new to programming Labview state machines, and can't figure out how to even start when the sequence of states is random instead of fixed!!! I can do 1,2,3,4, like the vending machine VI example, but, not 1,3,2,2,2,5,2,1 etc. based on external input. Is there some simple example case I can study? I can't believe I am inventing this for the first time.
"select the state to run"
But, HOW do I do this??????? This is exactly the question I am asking...how is this done? Please see the attached 3-state system....how do I hook this up???? I am totally lost here...can you help me understand how to wire this thing?? In this simpe RED/GREEN/BLUE case, my input is just the number a user would input on the front panel.... Apparently, there are two files necessary... a vi and .ctl??? What is .ctl?
Thanks,
Dave
Attachments:
forum nov 12 red green blue.vi ‏7 KB
forum nov 12 red green blue.ctl ‏5 KB

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
nbundle/bundle functions use a ton of memory??? Right now I am writing the cluster data to memory tags for each channel. I use the ring control to determine which tag to read. I have the tags grouped by channel into several groups for actual data, expected data, results data,... What design methods would provide the best function using a shift register/queues and notifiers/memory tags in the tag engine?? I also use CITADEL to read the max and average as a trend display on each channel and to select a specific 1000 point dataset to view if the max and average are out of limits. Does anyone have similar applications??

It sounds as if you will be working with alot of data here so I can understand your concerns for memory management. If you were to unbundle and bundle data in your application, you are correct in saying that it will require more memory. It is somewhat difficult to get the overall picture of what you are needing to set up, but from what I can gather, it sounds as if you could have an array of 32 elements; each element a cluster of your data as well as the statistical data, and then you could index through that array to determine what to display on the graph. The shift registers will be reusing the same memory over and over so there should not be a problem there. Queues wouldn't necessarily help you in any way in this situation. Depending on how many memory tag
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 run a particular case continuously in event based state machine architecture.

I am making a program using event based state machine architecture, it is running as expected whenever i am generating an event, case structure corresponding to that event executes.
we are taking some measurements from oscilloscope e.g. i am having one boolean button for rise time whenever i am pressing that that button it displays the value of rise time, it displays only once( since i have generated an event on that boolean button so it executes only once and displays value for one time and then comeback to timeout state) but in our program what we want, we want it to update value continously once that button is pressed.
Now for a time being i have placed while loop on the case corresponding to rise time but this is not the right approach.
since i am using state machine architecture( event based ), i am not getting how to run particular case continuously ,or if there is any other better architecture that i can use to implement the same application.
Attached below is the program.
Attachments:
OScilloscope .zip ‏108 KB

Say, in the attached program, when the user selects Autoset, it inserts corresponding state (Autoset) and now if you want this state to run again and again, probbbly you can again insert Autoset state while executing Autoset state... ohhh its confusing... check the picture below (A picture is worth a thousand words):
1. Based on user selection, insert Autoset state.
2. Re-insert Autoset state again and again while executing Autoset state.
3. Now to come out of this loop, based on appropriate event generation, insert any other state AT FRONT (equivalent to Enqueue Element At Opposite End).
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Customize Line Items Details Loading for Multiload TEXT-Based

Hi all,
has anybody customized HFM adapter to enable line item details loading for Text-based multiload files?
Is it possible?
Thanks

But then we wouldn't have one text multiload file but several text files that will be converted into several .dat files to be loaded into HFM.
Our current problem is that we have a multiload text file (we can convert from the Multiload Excel) but this file contains line item details. We want to keep the performance of loading only one .Dat file, but also load line item details.
What about if the user split the multiload files into two:
* Excel Multiload just with Line Item accounts (there are not so much)
* Text Multiload for standard accounts
This would be a nice solution as well? If they are happy....
Thanks

Data acquisition in a state machine

I've recently learned how to implement state machines, but I have a question that I haven't been able to find an aswer to.
Question:
How do I record uninterupted data (presently i'm using the DAQ assistant to record a single channel at 10kS/s at 1kS intervals) without interfering with my state machine?
Background:
I have a time sensitive test setup (measuring pressure in a rocket chamber), and I'm using labview to both record a single pressure transducer as well as operate the valves (O2, N2, igniter, etc). I'm using a state machine Labview architecture (just learned how). Presently, the DAQ assistant sits in the "Idle" state, and timers (valves need to be turned on at specific times) and manual buttons control when the other states are activated. I have a 10ms timer controlling how often each state is run, and this is the root of my concern.
Main concerns:
I'm worried that:
1) I'm forced to change my data recording to 10ms intervals to match the 10ms timer, and
2) The 10ms timer will interrupt my data recording when it's in another state.
It's very important that the pressure data is recorded without interruption but that I have high time resolution in controlling my valves as well.
Thoughts:
1) Maybe I put the 10ms timer in the "Idle" state only, and this way the other states won't interrupt the data acqusition
2) Maybe there is a way to completely isolate the state machine for controlling the valves and the data acqusition. I'm not sure how to do this.
3) People on the forums have been talking about Queuing their data acqusition, but I'm not sure how this would benefit my situation.
Thanks to everyone for their feedback!

The data acquisition and state machine timer do not have to be equal, you should however have the same data write rate as you have data read rate, otherwise over the course of long running programs you can build up a large buffer of data to be written using a lot of memory, or lose data.
Your data acquisition should be continuous, the most common way of doing this is every time you receive data write it to a queue, then when you are in other states except your data write stage you simply build up data in the queue that is to be written when you enter the write state again.
Think of it as traffic reaching a set of lights:
The traffic represents the data acquisition, there is a constant flow of it always coming through, the state of your state machine is the lights, green is the data write state clearing the queue, red is when in any other state, letting the traffic build up behind the lights.
It is just important that the light is green long enough to let the traffic not build up too much, otherwise you have a jam.
EDIT: For the basics of how queues work, look at the Queue basics example from the example finder.

State Machine and producer consumer design patterns

Hi!
In my application I am using state machine(for top level VI) and producer consumer(for subVIs) design patterns throught out.
If there is no activity on the front panel for 1min then the ideal state is invoked. Following are the situation of the ideal state:
1. It checks for any hardware present on the network . If no hardware is found on the network within 1 min then the application and LabVIEW exits.
2. While the ideal state checks for the hardware, and user clicks on any front panel button then it should exit the ideal state. The control
should be in the respective button state.
I am able to achive the point#1 mentioned above but could not get the point #2 to work. I am including the snap shot of
the state machine(default case) and prouducer consumer(deafualt state).
Each screen has the concept of the ideal state. The only additional step in the subVIs is that when the ideal state is reached and the time has expired then it will close the subVIfront panel.It will go to the exit state of the Main(top level) VI. Thus closing the application and quitting LabVIEW.
Any ideas or suggestions. Will multithreading and notifiers help?
TIA
Rachana
Attachments:
Sanpshot_Of_Design.zip ‏75 KB

Hi Rachana,
I was thinking about using event structures wherein there would an event case that would handle any value change event for any of the buttons on the front panel. But before suggesting that, I would need to know more about the Ideal State subvi( more specifically, how is it checking for any hardware present on the network and where is the one minute wait coming from?).
Please feel free to respond to this post with your questions/comments.
Regards,
Ankita A.

Replacing a state machine?

I am fairly new to using state machines and am hoping there is a simple solution to this question. I have one state machine that is saved (ie StateMachine1.ctl). I created a new state machine (StateMachine2.ctl) and want to replace all instances of StateMachine1 with StateMachine2 in my VI. Is there a simple way of changing the state machine without losing all the linked instances?
Thanks.
LWolfe.
Solved!
Go to Solution.

LWolfe wrote:
I am fairly new to using state machines and am hoping there is a simple solution to this question. I have one state machine that is saved (ie StateMachine1.ctl). I created a new state machine (StateMachine2.ctl) and want to replace all instances of StateMachine1 with StateMachine2 in my VI. Is there a simple way of changing the state machine without losing all the linked instances?
Thanks.
LWolfe.
Let's make sure we are using the correct terminolgy here. It seems that what you are calling a "state machine" is really a custom control, probably typedef'd and because it was typedef'd, probably an enum. I like to make mistakes like that, mistakenly calling something by the name of something else very closely associated with it.
So is your question really, "How do I replace one custom control with another?"
In this case, it might be just easier to modify your first control and forget about using the second. Assuming again that it is a typedef'd enum control, modifying the typedef'd enum that is already part of your state machine will ensure that the changes are propagated to all the other places.
Bill
(Mid-Level minion.)
My support system ensures that I don't look totally incompetent.
Proud to say that I've progressed beyond knowing just enough to be dangerous. I now know enough to know that I have no clue about anything at all.

Web Services for a State Machine Based VI

Hello,
I am new to the Web Services approach but so far I have managed to build a simple VI which is used with Web Services to display a Graph and make some simple calculations.
However, I have a more complex application which uses a State Machine architecture to command some circuitry using the NI USB 6211 device. This program includes different states and all the action takes place inside a while loop. This loop uses shift registers to pass the states arround (the JKI State Machine).
My question is: Could such a program be used with the Web Services without modifying this structure?
In the programs that I have tried, if I place the execution inside a While structure then I get no result with the Web Services.
An example of a simple program which includes a while loop and the Web Services approach would be helpful, if possible.
Thank you in advance.

Hello again,
I was trying to do what Nathand indicated.
1. "Put a functional global in it that stores whatever value you want to be queried over the web,"
So I opened a new Project and added the Index.vi just to generate the numbers continuously. This VI writes to a global variable entitled "GlobalOutput.vi".
This works as I have attached the jpg image.
2. "and make that VI accessible through VI server."
This I am not so sure I did correctly. I opened the Tools->Options->VI Server, and here at the section Exported VIs, I added the GlobalOutput.vi. I have attached the image.
3. "Then, in your web services VI, open a VI server connection to that functional global and run it, by reference, to obtain the value stored there."
Now I have created another VI, called ServerConnection.vi which runs the GlobalOutput.vi. I have attached the image with the error I get. Something is wrong in what I am doing. In the end I thought that I would create a Web Service for this last vi and basically be able to read the global variable.
As I understand it, you have a VI which runs locally, in a while loop and updates some global variables. Then another vi reads the values of those global variables.
It is this last vi that you should create a web service and interogate to find out the values of those variables. What am I missing?
Thank you in advance.
Attachments:
GlobalVariable.JPG ‏21 KB
ViServer.JPG ‏36 KB
error message.JPG ‏38 KB

New LabHSM Toolkit - Agile development of complex event-driven maintainable LabVIEW applications with active objects / actors based on a universal Hierarchical State Machine / statechart template.

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!

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State machine for text-based instrument control

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