Event Capture

In my application I am monitoring a series of sensors that are binary on or off. I need to somehow capture the event where one sensor goes from on to off. Any advice on how this can be done? I'm running LabVIEW 7.1 and windows 2000
Thanks,
J

Just do a AND operation between the previous value of the sensor ant NOT the new value. See the attached example.
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
OnToOff.zip ‏12 KB

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Hi OAF Gurus,
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Hi,
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InputListofValue PopUp window CANCEL button event capture ?

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Jdeveloper version 11.X.6.
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Step by step:
1. Create the converter class:
package view.converters;
import java.util.Collection;
import java.util.Collections;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import org.apache.myfaces.trinidad.convert.ClientConverter;
import org.apache.commons.lang.StringUtils;
public class LOVConverter implements Converter, ClientConverter {
public Object getAsObject(FacesContext facesContext, UIComponent uiComponent, String value) {
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public String getClientScript(FacesContext facesContext, UIComponent uiComponent)
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public String getClientConversion(FacesContext facesContext, UIComponent uiComponent)
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Hi
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Here is a sample program. You need to handle the event DOUBLE_CLICK by using a local event handler class.
REPORT ZRICH_0001.
TABLES: MARA.
DATA: BEGIN OF I_ALV OCCURS 0,
      MATNR TYPE MARA-MATNR,
      MAKTX TYPE MAKT-MAKTX,
      END OF I_ALV.
*       CLASS cl_event_receiver DEFINITION      Handles Double Click
CLASS CL_EVENT_RECEIVER DEFINITION.
PUBLIC SECTION.
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      IMPORTING E_ROW E_COLUMN.
PRIVATE SECTION.
ENDCLASS.
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CLASS CL_EVENT_RECEIVER IMPLEMENTATION.
METHOD HANDLE_DOUBLE_CLICK.
    PERFORM DRILL_DOWN USING E_ROW-INDEX.
ENDMETHOD.
ENDCLASS.
DATA: ALV_CONTAINER TYPE REF TO CL_GUI_CUSTOM_CONTAINER.
DATA: EVENT_RECEIVER TYPE REF TO CL_EVENT_RECEIVER.
DATA: ALV_GRID       TYPE REF TO CL_GUI_ALV_GRID.
DATA: FIELDCAT TYPE LVC_T_FCAT.
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME TITLE TEXT-001 .
SELECT-OPTIONS: S_MATNR FOR MARA-MATNR.
SELECTION-SCREEN END OF BLOCK B1.
START-OF-SELECTION.
PERFORM GET_DATA.
CALL SCREEN 100.
*      Module status_0100 OUTPUT
MODULE STATUS_0100 OUTPUT.
SET PF-STATUS '0100'.
SET TITLEBAR '0100'.
* Create Controls
CREATE OBJECT ALV_CONTAINER
         EXPORTING
               CONTAINER_NAME    = 'ALV_CONTAINER'.
CREATE OBJECT ALV_GRID
         EXPORTING
               I_PARENT          = ALV_CONTAINER.
* Create Event Receiver
CREATE OBJECT EVENT_RECEIVER.
* ALV Specific. Data selection.
* Populate Field Catalog
PERFORM GET_FIELDCATALOG.
CALL METHOD ALV_GRID->SET_TABLE_FOR_FIRST_DISPLAY
      CHANGING
           IT_OUTTAB       = I_ALV[]
           IT_FIELDCATALOG = FIELDCAT[].
*   handler for ALV grid
SET HANDLER EVENT_RECEIVER->HANDLE_DOUBLE_CLICK FOR ALV_GRID.
ENDMODULE.
*      Module USER_COMMAND_0100 INPUT
MODULE USER_COMMAND_0100 INPUT.
CASE SY-UCOMM.
    WHEN 'BACK' OR 'CANC'.
      IF NOT ALV_CONTAINER IS INITIAL.
        CALL METHOD ALV_CONTAINER->FREE.
        CLEAR: ALV_CONTAINER.
        FREE : ALV_CONTAINER.
      ENDIF.
      IF SY-SUBRC = 0.
        SET SCREEN 0.
        LEAVE SCREEN.
      ELSE.
        LEAVE PROGRAM.
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    WHEN 'EXIT'.
      IF NOT ALV_CONTAINER IS INITIAL.
        CALL METHOD ALV_CONTAINER->FREE.
        CLEAR: ALV_CONTAINER.
        FREE : ALV_CONTAINER.
      ENDIF.
      LEAVE PROGRAM.
ENDCASE.
ENDMODULE.
* FORM GET_DATA
FORM GET_DATA.
SELECT * INTO CORRESPONDING FIELDS OF TABLE I_ALV
        FROM MARA
          INNER JOIN MAKT
            ON MARA~MATNR = MAKT~MATNR
               WHERE MARA~MATNR IN S_MATNR
                 AND MAKT~SPRAS = SY-LANGU.
SORT I_ALV ASCENDING BY MATNR.
ENDFORM.
*      Form Get_Fieldcatalog - Set Up Columns/Headers
FORM GET_FIELDCATALOG.
DATA: LS_FCAT TYPE LVC_S_FCAT.
REFRESH: FIELDCAT.
CLEAR: LS_FCAT.
LS_FCAT-REPTEXT    = 'Material Number'.
LS_FCAT-COLTEXT    = 'Material Number'.
LS_FCAT-FIELDNAME = 'MATNR'.
LS_FCAT-REF_TABLE = 'I_ALV'.
LS_FCAT-OUTPUTLEN = '18'.
LS_FCAT-COL_POS    = 1.
APPEND LS_FCAT TO FIELDCAT.
CLEAR: LS_FCAT.
LS_FCAT-REPTEXT    = 'Material Description'.
LS_FCAT-COLTEXT    = 'Material Description'.
LS_FCAT-FIELDNAME = 'MAKTX'.
LS_FCAT-REF_TABLE = 'I_ALV'.
LS_FCAT-OUTPUTLEN = '40'.
LS_FCAT-COL_POS    = 2.
APPEND LS_FCAT TO FIELDCAT.
ENDFORM.
* DRILL_DOWN
FORM DRILL_DOWN USING INDEX.
READ TABLE I_ALV INDEX INDEX.
IF SY-SUBRC = 0.
    SET PARAMETER ID 'MAT' FIELD I_ALV-MATNR.
    CALL TRANSACTION 'MM03' AND SKIP FIRST SCREEN.
    IF NOT ALV_CONTAINER IS INITIAL.
      CALL METHOD ALV_CONTAINER->FREE.
      CLEAR: ALV_CONTAINER.
      FREE : ALV_CONTAINER.
    ENDIF.
ENDIF.
ENDFORM.
Regards,
Rich Heilman

During slow scan rates, are events captured between scans?

We are using 32 thermocouples to measure a heated cabinet performance and are using the Continuous Acquisition to Spreadsheet VI. I am saving the data to a text file while plotting the data to a chart in Labview 6.1. I only wanted to read temperature every 60 seconds (0.01667 scans/sec) but set the scan rate rounds off to 2 decimal places, so at 0.02 scan rate we read data every 50 seconds. I set the buffer size to 1 and the number of scans to write at a time to 1. Does this mean I have a lag of one scan in the buffer or am I seeing the latest scan written to the chart? Also, temperature events between writes to the screen sometimes show up on the chart, sometimes not. It seems to depend on how long the e
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You can actually change the digits of precision in LabVIEW to display more than 2 decimal places. If you right-click on the scan rate control and select 'Format and Precision' you can alter the digits of precision to include 5 decimal places.
By setting the buffer size to 1 you are setting a memory size to hold only 1 scan at a time. By setting the number of scans to write at a time to 1 that means that every time the AI Read VI is called within the while loop, the VI will only read 1 scan from the buffer. Therefore, the hardware is set-up to read 1 scan every 50-60 seconds and so the hardware places that scan in the buffer. Then every time the AI Read VI is called in software, it reads 1 scan from the buffer. So, if the AI Read VI already read
the 1 scan from the buffer, it will wait until the buffer gets the next scan from hardware (50-60 seconds) and then plot it on the chart. So, with the set-up you have, you will not see any lag of temperature data. Once the hardware scans, the software will almost immediately read that scan. I hope this helps.
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Todd D.
Applications Engineer
National Instruments

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this
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when I move the mouse over the spot where a tab's underneath the
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mouse?

You can just put an empty onRelease handler on your large
object, and set
its useHandCursor to false so it doesn't look like a button.
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http://www.blurredistinction.com
Adobe Community Expert
http://www.adobe.com/communities/experts/

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Hi Experts
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