How to display value in waveform chart

dear sir
i am using labview 7.0 with dsc module for scada.
now i want to display the difference between two tags value in waveform chart. Also i want to display that difference value on y axis and system date and time on x axis continously. Also if there will change in that tag value then there should be reflection of that value on wavwform chart with system time. Really i am in trouble. please help me.
falgandha mohire

Nadim,
Why would an XY graph be preferable to using a Waveform Chart where the "t0" is the time of the measurement?
I don't get it.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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Display Data on waveform chart or XY graph over a long period of time

Display Data on waveform chart or XY graph over a long period of time
Can anyone help?
I am acquiring data from an Ni DAQ card with the following parameters - sample rate = 12800, number of samples = 4096. I want to extract order information so as to track changes in the amplitudes of certain frequency harmonics. So I use the sound and vibration toolkit to extract this information as shown in the attached Vi. I will like to plot the resulting amplitudes against real-time starting at the time the Vi was run. I really want the display to show these changes over long periods (eg. days, months and even years).
Problem.
I have tried to plot the Y component of the resulting magnitude for a given order on a waveform chart. My choice of the waveform chart is because I also want to display alarm limits (using the mask and limit vi) (I can't have these lines displayed on an XY graph plot). I tried adjusting the scale offset using the property node and setting the offset to current time. However, the display on the X-axis can only show a span of 2 minutes as will be seen when you run the attached vi. I want the time display on the x-axis to be over a period of days, months and even years. Is there a way to set the maximum scale on the x-axis to be say a year or so in future.
I really want the display to be like the one in in the second attachment.
Attached is a sample VI created using an Ni USB 9234 DAQ card. Any card will do but I am only getting the signal from one channel for this example
I will appreciate any help that can be given to me.
Thanks
Attachments:
Real-Time Graph Display.vi ‏170 KB
Sampe screen1.doc ‏37 KB

Long term testing can be tricky- and we'l get into that later. Lets start with the basics that you have wrong.
The vi as you have constructed it has only one memory element, the chart history length (default is 1024.)
You can change the number of points the Chart will remember by Right-clicking the chart an select Chart History Length from the menu.
But for a long term test - and one where you want to REMEMBER the first value you need a memeory element that is independant of the application. Your PC WILL loose power or need to be rebooted eventually. Heck it might even need to be replaced! you really need to store your data in a file. Preferablly in a file that is backed-up on a regular basis so you don't lose every point of data if the PC dies. It realy hurts when you have to restart a 2yr test because you've lost the 18months of data you collected.
For an application like this I would seperate my "collection" and "Evaluation" operations.
Have one vi that takes the reading and writes it to a file at a configurable rate You may want 1reading per minute for seveal days then 1 per hour for a few weeks- then maybe only once or twice a week for the next couple of years since you are looking for LONG TERM stability. having too much data to evaluate can take a lot of digging to find the few things that interest you (but always take more that you think you need)
Have another utility that COPIES the files, reads them and displays the data you are interested in that day. The data you want to look at won't change over time HOWEVER, you WILL want to analize it in different ways depending on what the data trends look like. Having seperate routines for collection and display allows you to update the display style and analisys without even stopping the collection vi (much less editing the vi)
Jeff

How To Display Value In inputText When List Is Used

Hello,
I have a question regarding how to display value from List in a jsf page?
From a Map, i could display like
<ice:inputText id="plantno" value="#{bean.detailedRowData['plantno']}"So if I am using a List instead of Map, how can I refer value in List so that I could display my plantno?
<ice:inputText id="plantno" value="#{bean.?????}"Thanks

Create a backing bean method that fetches the value from the list for you.
<ice:inputText id="plantno" value="#{bean.plantNo}"/>
public class MyFunkyBean {
private List<String> rowdata;
public String getPlantNo(){
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How to display value in memory

How to display value in memory, except call function 'LIST_FROM_MEMORY' .
Thanks.

Hi
See this
may be useful
SAP memory is a memory area to which all main sessions within a SAPgui have access. You can use SAP memory either to pass data from one program to another within a session, or to pass data from one session to another. Application programs that use SAP memory must do so using SPA/GPA parameters (also known as SET/GET parameters). These parameters can be set either for a particular user or for a particular program using the SET PARAMETER statement. Other ABAP programs can then retrieve the set parameters using the GET PARAMETER statement. The most frequent use of SPA/GPA parameters is to fill input fields on screens
SAP global memory retains field value through out session.
set parameter id 'MAT' field v_matnr.
get parameter id 'MAT' field v_matnr.
They are stored in table TPARA.
ABAP memory is a memory area that all ABAP programs within the same internal session can access using the EXPORT and IMPORT statements. Data within this area remains intact during a whole sequence of program calls. To pass data
to a program which you are calling, the data needs to be placed in ABAP memory before the call is made. The internal session of the called program then replaces that of the calling program. The program called can then read from the ABAP memory. If control is then returned to the program which made the initial call, the same process operates in reverse.
ABAP memory is temporary and values are retained in same LUW.
export itab to memory id 'TEST'.
import itab from memory Id 'TEST'.
Here itab should be declared of same type and length.
http://www.sap-img.com/abap/difference-between-sap-and-abap-memory.htm
ABAP Memmory & SAP Memmory
http://www.sap-img.com/abap/difference-between-sap-and-abap-memory.htm
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
Reward points for useful Answers
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Anji

How to display values and new char line (blank line)

Hi,
In database, one field contains values followed by new character lines (blank lines) after blank lines there is no values. Finally, I would say the field contains values and blank lines. Every thing is fine in database.
In Crystal Reports the field is displaying only values. Need to display values and blank line.
User is asking after values new character lines (blank line) to be shown. They enter like that in an application. The user doubt is why report is not showing what they enter in the application.
In detail explanation, front end tool is ASP.NET and backend is SQL Server.
User enter some values in note field, after that they hit enter button in the same field, cursor will go next line...user may hit u2018enter buttonu2019 more than 5 times. So note field contain values and some blank lines which are created by after hitting enter button.
If user opens the application, they could see values plus blank lines in the note field.
They are fine with the application.
In Crystal Reports, the note field shows only values.
User is questioning that why we could not see in report we enter.
I checked in .Net application and SQL server database it is fine. It is displaying values and blank line.
Please help me out how to display values followed by blank lines in Crystal Reports - the way they enter in the application.
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Hi,
Sharonmat,
I tried as you suggested. It is still displaying only values.
I would like to explain again.
it is not exactly null values.
In .Net application it is called 'new char line'.
it shows those many lines look like null.
it is working fine in database.
Why it is not working in Crystal Reports? I am wondering...
Thanks for your suggestion.
Debi,
User may enter any number of blank lines or they may not enter blank lines.
That is the reason I can not always give more height or blank text object.
Thanks for your suggestion.
Please suggest me some more suggestions,
Thanks and Regards,
Manjunath N. Jogin

How to update the absolute time value in waveform chart for labview 6i?

Hey there,
I'm developing a control system using labview 6i on win 2000 os.I'm receiving the sensor data every minute and i want to display the data on a waveform chart with absolute time scale on x-axes. I'm using the property nodes for the offset, multiplier and maximum values putting them outside the while loop and giving them input using get date/time in seconds function. the problem is that the time doesn't gets updated w/ refernce to the computer time and after a certain period the time shown on x-axes lags by several hours. any advise?

Posting an example ussually help us nail these types of issues fast.
I am therfore forced to guess.
Do you have your code written such that the scale operations occur before the loop?
The next thing I have to suspect (not being able to see your code) is if your dt is correct. If your dt is larger than what the chart is set for, then the time will fall behind.
I have included an image showing how the chart can be used to show multiple sample rate plots such that the t0 of the readings are used to control how the readings are displayed. This example uses waveform data types (I believe they were available back in 6i). It should serve as a guide to do what you want.
I suggest you start by recreating the demo and play with it until you have what
you will need in your app.
The beauty of this method is it lets you use the chart to plot signals acquired at different frequecies and plot them all together.
reply to this answer if you have questions,
Ben
Ben Rayner
Certified LabVIEW Developer
www.DSAutomation.com
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
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Wform_demo.bmp ‏427 KB

How to display values inside the Pie chart?

Hi Expert,
How to display the values inside the Pie chart, instead of Mouse over values. Can u pls help me to do this one.
Is it possible can we use mentioned below kind of pie charts in Xcelsius 2008.
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Tamil
Edited by: Rajesh Kumar Thoppe on Dec 13, 2010 10:41 AM

Hi A G,
Thank You for quick response!!!
in this Text tab I am able to see below check box only
1) Chart Title
2) Sub Title
3) Legend
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Kindly advise me if i am wrong and let me know how to achieve this.
Note: We have Xcelsius 2008 environment
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Tamil
Edited by: Rajesh Kumar Thoppe on Dec 13, 2010 1:58 PM

Average value for waveform chart

Hello everyone.
Can i make a time interval, where i can measure average value for a waveform chart ?
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Thanks in advance
Oesen
Best regards
Oesen
Solved!
Go to Solution.
Attachments:
Trykmaaling.vi ‏83 KB

Oesen,
When you are displaying data on a chart, the newest data is appears at the right of the previous data. When the chart history buffer is full (default length = 1024), adding a new point deletes the oldest point. Visually it appears that the data slides to the left as new data is added to the right end.
My question relates to how the user would "tell" the program what data to average. In the image you posted you marked a segment of the data to be averaged. Suppose the user marks point "A" as the beginning of the segment. While the user is deciding where to put mark "B" additional data is acquired and point "A" disappears because it is beyond the history length. What does the program do in such a case? A slight variation is the situation where both "A" and "B" have been marked but some of the data is deleted from the history before the averaging or other processing has begun.
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Get max and min values from waveform chart

Hi all
Ive got a waveform chart and want to display the max and min value for the graph. How do i get the respective values?? Im using LabView 8.2
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Attachments:
Untitled 231_LV80.vi ‏23 KB

Thanks Mike

Display value in Bar chart conditionally

I've a chart with Bar-Vertical Stacked type. In one bar 7/8 stacks are coming, some of value 1000 and some of very small values like 2, 5,6 etc. For each of these small bars when I'm displaying value in center position with markerTextPlace="MTP_CENTER", it becomes clumsy.
In this case, I want to only show the slice in vertical bar but not to display value if value<10.
How this condition can be checked to view value.
Please suggest. Kind Regards.

Can anyone please suggest.
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How to achieve this in waveform-chart?

I do use waveform chart in which 3 waveforms are stacked. My x-axis represent current time and y axis is a some quantity...Please look at the picture attached....is it possible to do this in waveform chart? Whenever mouse/cursor is on waveform it should display y-axis value corresponding to that point.......

Hi HS,
do you use 2 different logins?
If you would enable/show the cursor palette of the graph you would actually see those values instantly...
When you want to calc with them you can use the properties of the cursor to get the x- and y-value! No calculation of graph size and so on needed...
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GerdW
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How to implement cursor in waveform chart?

Hi,
i have used visa tools for making .dat file of data values...i used waveform chart to graphically represent data of that file.i want to implement cursor in that can you help me out how to do it.
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vijtin
Solved!
Go to Solution.

Hi vijtin,
replace your chart with a graph to enable a cursor legend...
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GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
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How to display value in two rows?

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There are two column value in db which will be displayed in on table cell.
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Beavey

Hi Saichand.V,
Thank you for your replay!
I try it, but the layout is not right.
I using the following method:
Using "Edit Formula" in table, then "Column Formula" is set as "CONCAT(CONCAT('Facility: ',PRO_M_FACILITY.ABBR_NAME), CONCAT('<>Department: ',PRO_M_DEPARTMENT.DEPARTMENT_NAME) )". I want to use "<>" to display "Department: XXXXXXX" in the second row, but it also does not work.
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Display values on a chart

hi,
in excel, you can display the value of a bar in a chart right on the chart.
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after looking at some of the chart samples, i noticed that i did not see this
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HI, Tracy
In CX 4.5 Pro the option is in the following Path
--> Double Click on the Chart from the Properties Window select the Appearance tab
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Now the problem is that you want to display the Values but it display the Numbers as if there are categorize 1 to 9 than it show the Number from 1 to 9 and color of that Category in the Chart.
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Like Just right side of you Chart Place a List View or Table view and Point the display Values of that Control to the Values you are displaying in the chart.
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From
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RS232 transmits binary. If you transmit the character A, that gets converted to hex 41 or 01000001 (assuming 8 data bits). There is also start, stop, parity bits. The logic levels for RS232 can between +3 to +12 volts or -3 to -12 volts. When you use LabVIEW to read a serial port, the UART in the pc will convert that digital data back into the character A and that's what LabVIEW or any other communications program like Hyperterminal will read. What exactly do you have hooked up to the serial port of the pc? Is it some kind of instrument or what? If it's an instrument sending data, then how the data is interpreted is dependent on the instrument. It might send back a reading as text. A 1 volt measurment might be transmitted as the ASCII characters "1" and "v". Other instruments might encode the data differently. Measurements made over a serial port can be easily visualized. Plain text received over a serial port is usually displayed as text.

How to display value in waveform chart

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