Shortcut to pass all wires through Sequence structure

Hi,
I have a silly doubt about sequence structure that I used sequence structure to give some delay between my modules. I need pass all the wires through Seq Stru, So, I doped a Seq Stru on all wires But all wires are still in the background(not through Seq stru). I can make them by selecting each one but is there any option available that can just pass all existed wires through it.

Assuming you're using a Flat Sequence....
Tack the wire to the sequence structure edge, which will create a tunnel. From that tunnel, wire through to the next frame, etc.
Better yet, don't use the sequence structure. Use error in / error out wiring to force dataflow from your modules to a delay timer VI that has error in/our terminals, such as the one from Open G, or make your own.
edit: two good responses while I was typing!
Richard

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Remove the stacked sequence structure from LabVIEW.

Remove once and for all the stacked sequence structure from labVIEW
It's an absolute horror.

> Sequence locals are sometimes (for very few cases) usefull if you know how to use them properly
What does that even mean????
(.. and you are repeating basically the same statement about four more times as if the use of sequences and sequence locals is an advanced skill, only to be used by LabVIEW masters. Your post is so redundant that it could be condensed to 20% of the size without loss of information).
It is clear that the stacked sequence can never disappear from LabVIEW, because of the need for backward compatibility. (It could be taken out of the palette, but why...).
LabVIEW Champion . Do more with less code and in less time .

I have a networked HP L7780 all in one printer and I can not get it to fax through my Macbook Pro. I have downloaded all the drivers and it has passed all the tests. Every time I try to fax it shows the job paused.

I have a networked HP L7780 all in one printer and I can not get it to fax through my Macbook Pro. I have downloaded all the drivers and it has passed all the tests. Every time I try to fax it shows the job paused. I can manually send and receive faxes but I can not do it through the computer.

Try deleting the printer, deleting the job queue and reinstalling the printer again.

Shortcut for closing all sequences?

Anyone know if there's a shortcut for closing all sequences opened in the timeline?

I use the sledgehammer approach: just close the canvas window. Poof, all closed. Timeline clear.
Then just open the sequence you want.

Passing a UNIXProcess across the wire through RMI

hi....
Well, is it possible to send a remote UNIXProcess across the wire through rmi?
when Iam trying to do that the following exception is being thrown....
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.lang.UNIXProcessThanks for any help.
cheers.......

well, since we are talking about streaming, sockets will definitely be closer to what you want. however, in many ways sockets are more work to setup and manage compared to rmi. but, if you are sticking with the core jdk i would definitely recommend using sockets, because streaming over rmi is not easy to implement, and you're much better off dealing with sockets. of course, since you are probably already using rmi for the high level communication, using a library like RMIIO allows you to leverage the existing communication infrastructure, instead of dropping down to sockets for the input/output streaming. each side has its pros and cons.

Question about the sequence structure

Hi,
If we want to get best performance when programming a sequence of functions or calculations, we should choose 'Stacked sequence structure' or 'Flat sequence structure'? or they have the same performance?
Thanks.

To the best of my knowlege there is no performance hit, the "Flat sequence structure" was a fairly recent addition to try and overcome one (of many) complaints about sequence structures in general, that stacked sequences obscure what is happening in the code. If the various sections of your calculation or functions have data dependency, i.e. the output of a calculation is fed into the subsequent calculation or function, then a sequence structure is probably not needed as, with data flow, the calculation that is "dependent" won't executed until all its inputs requirements are satified. If the "functions" are in the form of sub-vi's the method that is more "proper" is to inforce a dependency between subsequent vi's. This can be as simple as adding error in and out controls to the sub-vi's, even if they are only passed through the vi without actually performing an error function. This allows you to wire them together in the execution order that is required. Doing this on some of the early "built-in" functions that have remained in LabVIEW (the original timer functions) sometime requires putting a wrapper around them to make them sub-vi's with error passing, but in the latest versions of LabVIEW the compiler seems to do a good job of minimizing any performance hits this might appear to cause.
Putnam Monroe
LabVIEW Evangelist since 1992
Putnam
Certified LabVIEW Developer
Senior Test Engineer
Currently using LV 6.1-LabVIEW 2012, RT8.5
LabVIEW Champion

Control references and sequence structures

My supervisor and I were discussing one of his programs, and he asked
me if I knew why he kept getting "Object reference is invalid" on a
property node that was using a reference. I couldn't figure it
out either, and eventually I said to try moving the actual control
itself (on the block diagram), into the first pane of the sequence
structure, and just feed the wire through.
This solved all of our problems... however both of us were
stumped with why what I suggested actually made it work. Anyone
know why this is?
Oops... I just realized that I made this on the breakpoint board
instead of the LabVIEW board...sorry. Although I suppose that the
people who frequent this might be the best to answer this...
Message Edited by Novatron on 07-14-2005 05:24 PM

There should be no difference between the two code versions IF you adhere to proper dataflow.
(Of course it is conceivable that the program is a mess and there is a race condition, e.g. if the reference is initially invalid and you set it elsewhere in the code via e.g. a local variable of the reference. In this case, a subtle change (e.g. the sequence structure) can rearrange the execution order for it to suddenly work by accident.)
I would be very curious to see a working example that demonstrates your described behavior.
LabVIEW Champion . Do more with less code and in less time .

Help with cycling sequence structure, I may need a state machine?

Hi All,
So I have this VI that needs to control two solenoid valves by opening and closing them through the digital outputs.
I want the program to have a function like this
Phase 1: Valve 1 open, Valve 2 closed (Amount of time for this defined by user)
Phase 2: Both valves closed (for .1 seconds)
Phase 3: Valve 1 closed, Valve 2 open (Again, this amount of time is defined by user)
and I want it to cycle through phase 1-3 100,000 times. However, every 10,000 cycles of phase 1-3 I want it to change the condition on Phase 2 so that both valves are closed for an hour instead of .1 seconds, then after this hour loop I want it to return back to the original cycling conditions (.1 sec instead of 1 hour) until it does another 10,000 cycles.
I was thinking that a sequence loop would be fine because I would wire it up with timing and a counter, and every time it goes to the last sequence it would increase the counter so that when its at the phase 2 timing I can use a case structure (if counter > 10,000 hold 1 hour, if counter <10,000 hold .1 sec) and then in the last sequence reset the counter to 1 if it is >10,000.
I thought a sequence structure would be good for this but I'm fairly new to labview and if theres a better way to do this I'm open to suggestions .
Attached is my code so far, except that I have not finished wiring the ports for valve B
Attachments:
Adhesive Pressure Cycling.vi ‏100 KB

First, you should avoid the use of a sequence structure. Don't even consider it to be an option. At least not at this stage of your learning. Learn how to use data flow. Also, avoid the use of local/global variables. They tend to lead to race conditions which in turn result in some difficult bugs to find and fix. Think of the wires as your variables.
As for the time delay in your state machine, your actual state should delay for a short time like 100 ms. Use the current time of day to determine when you have reached your desired timeout. If you use a single delay of an hour your program will be unresponsive for that hour. Users tend to get very annoyed if they try to stop the program and they have to wait a long time for it to actually stop.
Here is a basic example that shows the concept in a state machine.
When naming states for your state machine give them a meanigful name. Use a typedefed ENUM for your state variable. For simplicity sake the example attached does not use a typedef. But naming things like State 1, State 2 and so on makes the code difficult to read and understand. Your Open/Close valves states can be written in such a way that they are generic and take the valve data as input. At a minimum I would create a subVI to do this so you only have one piece of code to manage. You could have explcit states though such as Open Valve A and Open Valve B that call your generic Open Vavle subVI with the appropriate input data.
One last comment, the express VIs tend to be very inefficient. They are OK for learning how things are done but I would implement their functionality directly. For example, the express VIs tend to open, initialize, do something, close the instrument. You really don't have to do all of that every time. Open and Initialize once in the begining (hint, this could be a state), put the stuff that does the work in appropriate states/subVIs (other states) and then close at the end of your application (the exit state for example).
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot
Attachments:
Simple Delay in State Machine.vi ‏15 KB

Making sequence structures a state machine

Hey I would like some help I need to work on changing my code and get rid of the flat sequence structure and replace with a state machine I have attached my code at an earlier state but would like some input on changing it over to a state machine in the sequence at the bottom of the code this program is used to cycle a valve and the sequences need to be done in order .any input would be great.
Attachments:
valve Cycles with temp.vi ‏132 KB

Right click on the Flat Sequence and pick Replace with Stacked Sequence (never would have thought I'd say that.)
Right click on the Stacked Sequence and Replace with Case Structure.
Now a lot of wires will wind up broken. So you'll need to hunt them down and fix them. Those wires will probably need to go to shift registers so there values are maintained for the next loop iteration. Keep a copy of your original VI so you have something to refer back to.
Create a Typedef Enum and define what your states will be.
Start wiring the Enum into a shift register at the left of the loop, then into the selector of the Case Structure. Rename all the cases to what their respective state should be.
Wire enum constants in each case to direct what the next case should be. It will run out of the case structure to the right hand shift register.
Keep working and cleaning still everything is fixed.
Try running your VI to see if it behaves like it originally did.
Now you are safe to start making modifications to make it behave like you really want it to.

Plotting data from sequence structures.

Hi all,
I have a program that contains two pages in a sequence structure. On each page, I am generating data and I would like to plot this data in real-time on an XY graph. I understand that once I've executed Page 0 in the sequence structure, I cannot go back to this page. As such, once this page has finished executed I would need to pass the data to the next page. However, I would like to plot both datasets on *one* XY graph. Is this possible? I've tried putting the graph outside the sequence structure, but the data is not allowed to pass to graph until the page is executed (so it is not real-time plotting). I've included the VI I've been working on.
Attachments:
appendgraphs.vi ‏30 KB

Hi,
if you really want to use sequence, you can use a local variable of the graph to add points on the second frame, see modified.vi.
Anyway you can get the same functionality without sequence, see optimized.vi.
Good luck,
Alberto
Attachments:
modified.vi ‏33 KB
optimized.vi ‏27 KB

Event structure in sequence structure troubles

Hello, for class I have to write a simple LabView calculator but I'm having some issues. This is my first taste of labview so I know the code isn't the best but I just would like to know what's causing my hang up. I have two similar event structures with in a sequence structure. When I run it it goes through one loop of the while loop and then hangs, I tried stepping through it but can't figure out where it goes. If I don't have the second event structure it works more or less fine. Been working on this all day and hit this wall. Thanks.
Attachments:
lab1_3_try.vi ‏132 KB

You cannot have two event structures like that. Event structures queue up events, even if they cannot react to them because of dataflow. Your second event structure will also queue up all the events, but cannot execute them because it is not in the dataflow. In addition, your events are configured to lock the front panel until the event completes, and since some events can never complete, your panel is locked up forever.
Don't duplicate code twice, just keep state (A or B) in a shift register and do everything in a single event structure in a single loop.
What prevents you from hooking up the numeric terminals and buttons? Try to eliminate all these local variables keep the data in a shift register instead. Place each button terminal inside it's assiciated event and make them latch action. Now you can use "value changed" events instead of "mouse down".
LabVIEW Champion . Do more with less code and in less time .

How to pass all values from one node element to created node element?

Hi
I have model node element under which there are 7 values, and I've created value node element and trying to pass the values from the model node Element to this value node element. But instead of passing all the values its listing only one value.
How do we rectify this problem!!!
Thanks in Advance
Srikant

Hi Anil
I've created the node named: TableNode
and the name of the node from which i want to get the data is : Li_Required_Node
the Node Structure is
Context
|_ Zs_Quantity_Input
     |_Output
       |_Node_Required_Node
          |_Schddt
|_TableNode
    |_CmpDate
The Schddt has some 7 values
The code Snippet is as follows:
IPublicPricesComp.ITableNodeElement nodeElement;
IPublicPricesComp.ILi_Required_NodeElement scheduleElement;
int counter3Max = wdContext.ILi_Required_Node().size();
for( int counter3= 0 ; counter3 < counter3Max ;counter3++ )
nodeElement = wdContext.createTableNodeElement();
                         scheduleElement = wdContext.nodeZs_Quantity_Input().nodeOutput_Contract_Qty().nodeLi_Required_Node().getLi_Required_NodeElementAt(counter3);
nodeElement.setCmpDate(scheduleElement.getSchddt());
wdContext.nodeTableNode().addElement(nodeElement);
On writing the above code and then binding the node to a table column only one value getting displayed
Where can be the error?
Thanks in Advance
Srikant

How to pass the JCO Table and Structure in a collection List to frontEnd

hi,
I have a BAPI which is returns me a Table and a structure. As i have used JCO I will receive it in JCO Table and JCO Structure. Now the question is that how I should pass both these of these using a collection to the frontend for displaying the data from it.
Thanks' & Regards,
Samir

Hi Samir,
As you are trying to pass the Table and the Structure in the form of collection to the JSP page, you can create a javabean with the structure similar to that of the table/Structure.
Lets assume you have a table called Employee with Emp_Name, Emp_Age, Emp_Sal as three columns, create a java class by name Employee which implements Serializable and attributes as Emp_Name, Emp_Age and Emp_Sal. Generate the setters and getters for the same. In your EJB code, create an instance of this Employee class and set the attributes and save it in a HashMap in the form of key value pair, Value being your Employee class instance and key be your Employee Name. Return the HashMap in your EJB code.
Use the HashMap in your JSP. Get the Iterator for the HashMap and Loop through the keys to get the values.
Hope this helps.
Regards,
Rekha Malavathu

Process XML attributes of all tables in a structured document

Hi all,
I try to process the XML attributes of all tables in a structured document.
When I use SelectedTbl everything works fine for the selected table and the attributes of the tabelle Element are written correctly to the Console.
doc = app.ActiveDoc;
table = doc.SelectedTbl;
if (table.TblElement)
    Console('Elementname: ' + table.TblElement.ElementDef.Name);
    tblEle = table.Element;
    attrs = tblEle.GetAttributes();
    for (i = 0; i < attrs.len; i++) {
        aName = attrs[i].name;
        aWert = attrs[i].values;
        Console( "     " + aName + "    " + aWert);
However when I use GetText(Constants.FTI_TblAnchor) to walk through all tables of the documens neither ElementDef.Name nor Attributes are processed.
var flow = doc.FirstFlowInDoc;
var textItems = flow.GetText(Constants.FTI_TblAnchor);
while(iTab<textItems.length) {
table = textItems[iTab].obj;
if (table.TblElement)
    Console('Elementname: ' + table.TblElement.ElementDef.Name);
    tblEle = table.Element;
    attrs = tblEle.GetAttributes();
    for (i = 0; i < attrs.len; i++) {
        aName = attrs[i].name;
        aWert = attrs[i].values;
        Console( "     " + aName + "    " + aWert);
Any Suggestions?
Yours
Wolfgang

You'll probably want all the tables from the main flow. Try
var flow = doc.MainFlowInDoc;
Kind regards
JoH

To pass the values in repetitive structures any function module

hi all,
      Is there any function module to pass the values in repetitive structures like infotype 0041(Date spcification). I heard there is a function module, so any of you can tell that function module.
thanks,
sekhar.

Hi Chandra,
If your question is to find a date for a given dar value in IT 0041 then this is the sol:
Yes there is a function Module for IT0041, HR_ECM_READ_IT0041_DATE_TYPE
eg:
INFOTYPES: p0041.
DATA: lv_msg TYPE REF TO if_hrpa_message_handler,
          lv_date TYPE D.
GET pernr.
CLEAR: lv_date.
    CALL FUNCTION 'HR_ECM_READ_IT0041_DATE_TYPE'
      EXPORTING
        datar           = 'U2'       " specify the value of the dar value, for which u have to find date
        p0041           = p0041
        message_handler = lv_msg
      IMPORTING
        date            = lv_date.
For the dar value U2, lv_date will have the corresponding date.
Hope this will clear your doubt.
Thanks,
Kishore

Shortcut to pass all wires through Sequence structure

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