How can I generate digital output?

I was introduced to LabVIEW and NI Elvis last month and I have been asked to generate three digital signals to control three different relays.
what are the basic steps I have to do to generate the signals

You may want to start with this overview.
Your specific application is rather easy, so you may be able to even use the parallel port to control the relays, but that depends on the type of relay, current source/sink requirements, voltage requirements, etc.

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    Hi!
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    I think the example you want to look at is Digital - Continuous Output.vi.  You can just use the onboard clock and set the sample rate to whatever you need (100kHz it looks like).
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    how can i synchronize analog output and analog input timings to generate and measure voltage at the same time.

    Read this Tutorial
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  • How can we modify alv output list

    Hi
    this is fazil.
    Please tell me any body How can we modify alv output list.
    Thanks & Regards
    Fazil
    [email protected]

    Fazil,
    check the program,
    You can find the code in this program 'BCALV_FIELDCAT_TEST'
    *& Report  BCALV_FIELDCAT_TEST                                         *
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    data: ok_code               type sy-ucomm,
          save_ok_code          type sy-ucomm,
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          gt_fieldcat           type lvc_t_fcat,
    fieldcatalog for fieldcatalog itself:
          gt_fcatfcat           type lvc_t_fcat,
          gs_fcatlayo           type lvc_s_layo.
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    data: carrname type s_carrname.
            include structure sflight.
    data: end of gt_sflight.
    data: g_max type i value 100.
    data: g_all type c value SPACE.
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    data: g_custom_container type ref to cl_gui_custom_container,
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    class lcl_event_receiver definition.
      public section.
        methods handle_data_changed
          for event data_changed of cl_gui_alv_grid
          importing er_data_changed.
    endclass.
    class lcl_event_receiver implementation.
      method handle_data_changed.
    at the time being, no checks are made...
      endmethod.
    endclass.
    data: event_receiver type ref to lcl_event_receiver.
    end-of-selection.
      set screen 100.
    *&      Module  STATUS_0100  OUTPUT
          text
    module status_0100 output.
      set pf-status 'BASIC'.
      set titlebar 'BASICTITLE'.
    create ALV Grid Control in the first run
      if g_docking is initial.
        perform create_and_init_controls.
      endif.
    endmodule.                             " STATUS_0100  OUTPUT
    *&      Module  USER_COMMAND_0100  INPUT
          text
    module user_command_0100 input.
      save_ok_code = ok_code.
      clear ok_code.
      case save_ok_code.
        when 'SUBMIT'.
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    ATTENTION: DDIC-Fields are not updated using this method!
    (see 'RESTART')
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               exporting
                 it_fieldcatalog = gt_fieldcat.
          call method g_alv->refresh_table_display.
          call method cl_gui_cfw=>flush.
        when 'RESTART'.
    Destroy the control currently visible and display it again
    using the changed fieldcatalog.
          perform restart_sflight.
        when '&ALL'.
          perform switch_visibility.
      endcase.
    endmodule.                             " USER_COMMAND_0100  INPUT
    *&      Form  CREATE_AND_INIT_CONTROLS
          text
    -->  p1        text
    <--  p2        text
    form create_and_init_controls.
      create object g_docking
          exporting
               dynnr = '100'
               extension = 150
               side = cl_gui_docking_container=>dock_at_bottom.
      create object g_alv
          exporting
               i_parent = g_docking.
      create object g_custom_container
          exporting
               container_name = 'CC_0100_FIELDCAT'.
      create object g_editable_alv
          exporting
               i_parent = g_custom_container.
    register events
      create object event_receiver.
      set handler event_receiver->handle_data_changed for g_editable_alv.
      call method g_editable_alv->register_edit_event
                    exporting
                       i_event_id = cl_gui_alv_grid=>mc_evt_modified.
      perform build_fieldcatalogs changing gt_fieldcat gt_fcatfcat.
      perform modify_fieldcatalog changing gt_fcatfcat.
      perform select_data.                 "CHANGING gt_sflight
      call method g_alv->set_table_for_first_display
              changing
                   it_outtab       = gt_sflight[]
                   it_fieldcatalog = gt_fieldcat[].
    optimize column width of grid displaying fieldcatalog
      gs_fcatlayo-cwidth_opt = 'X'.
    Get fieldcatalog of table sflight - alv might have
    modified it after passing.
      call method g_alv->get_frontend_fieldcatalog
                importing et_fieldcatalog = gt_fieldcat[].
      call method cl_gui_cfw=>flush.
    Display fieldcatalog of table sflight:
      call method g_editable_alv->set_table_for_first_display
              exporting
                   is_layout       = gs_fcatlayo
              changing
                   it_outtab       = gt_fieldcat[]
                   it_fieldcatalog = gt_fcatfcat[].
    register events
      create object event_receiver.
      set handler event_receiver->handle_data_changed for g_editable_alv.
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    *&      Form  restart_sflight
          text
    -->  p1        text
    <--  p2        text
    form restart_sflight.
      data: ls_fieldcat type lvc_s_fcat.
    free g_docking and thus g_alv
      call method g_docking->free.
      clear g_docking.
      clear g_alv.
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          exporting
               dynnr = '100'
               extension = 150
               side = cl_gui_docking_container=>dock_at_bottom.
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          exporting
               i_parent = g_docking.
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      call method g_alv->get_frontend_fieldcatalog
              importing
                   et_fieldcatalog = gt_fieldcat[].
      call method g_editable_alv->refresh_table_display.
      call method cl_gui_cfw=>flush.
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          text
    -->  p1        text
    <--  p2        text
    form select_data.
      data: lt_sflight type table of sflight with header line,
            ls_scarr type scarr.
    select data of sflight
      select * from sflight into table lt_sflight up to g_max rows.
    copy data to gt_sflight and update CARRNAME
      loop at lt_sflight.
        move-corresponding lt_sflight to gt_sflight.
        select single * from scarr into ls_scarr
           where carrid = gt_sflight-carrid.
        gt_sflight-carrname = ls_scarr-carrname.
        append gt_sflight.
      endloop.
    endform.                               " select_data
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          text
         <--P_GT_FIELDCAT  text
         <--P_GT_FCATFCAT  text
    form build_fieldcatalogs changing p_fieldcat type lvc_t_fcat
                                      p_fcatfcat type lvc_t_fcat.
      data: ls_fcat     type lvc_s_fcat.
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    generate fieldcatalog automatically
      call function 'LVC_FIELDCATALOG_MERGE'
          exporting
               i_structure_name       = 'SFLIGHT'
            I_CLIENT_NEVER_DISPLAY = 'X'
           changing
                ct_fieldcat            = p_fieldcat[]
       EXCEPTIONS
            INCONSISTENT_INTERFACE = 1
            PROGRAM_ERROR          = 2
            OTHERS                 = 3
      if sy-subrc <> 0.
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      endif.
    shift all column positions to the right except for MANDT
      loop at p_fieldcat into ls_fcat.
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          add 1 to ls_fcat-col_pos.
          if ls_fcat-fieldname = 'CARRID'.
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          endif.
          modify p_fieldcat from ls_fcat.
        endif.
      endloop.
    create a new line for CARRNAME in p_fieldcat
      clear ls_fcat.
      ls_fcat-fieldname = 'CARRNAME'.
      ls_fcat-ref_table = 'SCARR'.
      ls_fcat-col_pos = 1.
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      insert ls_fcat into p_fieldcat index 1.
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    This fieldcatalog is used to display fieldcatalog 'p_fieldcat'
    on the top of the screen.
      call function 'LVC_FIELDCATALOG_MERGE'
          exporting
               i_structure_name       = 'LVC_S_FCAT'
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           changing
                ct_fieldcat            = p_fcatfcat[]
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            PROGRAM_ERROR          = 2
            OTHERS                 = 3
      if sy-subrc <> 0.
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      endif.
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          text
    module exit_program input.
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        if ls_fcat-fieldname = 'COL_POS' or ls_fcat-fieldname = 'FIELDNAME'.
          ls_fcat-key = 'X'.
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        modify p_fcatfcat from ls_fcat.
      endloop.
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    For a documentation choose "Help->Application Help" in the menu.
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        or   ls_fcat-fieldname eq 'COLDDICTXT'
        or   ls_fcat-fieldname eq 'COLTEXT'
        or   ls_fcat-fieldname eq 'CURRENCY'
        or   ls_fcat-fieldname eq 'DD_OUTLEN'
        or   ls_fcat-fieldname eq 'DECIMALS_O'
        or   ls_fcat-fieldname eq 'DECMLFIELD'
        or   ls_fcat-fieldname eq 'DO_SUM'
        or   ls_fcat-fieldname eq 'DRAGDROPID'
        or   ls_fcat-fieldname eq 'EDIT_MASK'
        or   ls_fcat-fieldname eq 'EMPHASIZE'
        or   ls_fcat-fieldname eq 'EXPONENT'
        or   ls_fcat-fieldname eq 'FIELDNAME'
        or   ls_fcat-fieldname eq 'HOTSPOT'
        or   ls_fcat-fieldname eq 'ICON'
        or   ls_fcat-fieldname eq 'INTLEN'
        or   ls_fcat-fieldname eq 'INTTYPE'
        or   ls_fcat-fieldname eq 'JUST'
        or   ls_fcat-fieldname eq 'KEY'
        or   ls_fcat-fieldname eq 'LOWERCASE'
        or   ls_fcat-fieldname eq 'LZERO'
        or   ls_fcat-fieldname eq 'NO_OUT'
        or   ls_fcat-fieldname eq 'NO_SIGN'
        or   ls_fcat-fieldname eq 'NO_SUM'
        or   ls_fcat-fieldname eq 'NO_ZERO'
        or   ls_fcat-fieldname eq 'OUTPUTLEN'
        or   ls_fcat-fieldname eq 'QFIELDNAME'
        or   ls_fcat-fieldname eq 'QUANTITY'
        or   ls_fcat-fieldname eq 'REF_FIELD'
        or   ls_fcat-fieldname eq 'REF_TABLE'
        or   ls_fcat-fieldname eq 'REPREP'
        or   ls_fcat-fieldname eq 'REPTEXT'
        or   ls_fcat-fieldname eq 'ROLLNAME'
        or   ls_fcat-fieldname eq 'ROUND'
        or   ls_fcat-fieldname eq 'ROUNDFIELD'
        or   ls_fcat-fieldname eq 'SCRTEXT_L'
        or   ls_fcat-fieldname eq 'SCRTEXT_M'
        or   ls_fcat-fieldname eq 'SCRTEXT_S'
        or   ls_fcat-fieldname eq 'SELDDICTXT'
        or   ls_fcat-fieldname eq 'SELTEXT'
        or   ls_fcat-fieldname eq 'SP_GROUP'
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      endloop.
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         perform hide_fields changing lt_fcatfcat.
         g_all = SPACE.
    else.
        loop at lt_fcatfcat into ls_fcat.
           if ls_fcat-tech eq 'X'.
               ls_fcat-tech = SPACE.
               ls_fcat-no_out = 'X'.
               modify lt_fcatfcat from ls_fcat.
           endif.
        endloop.
        g_all = 'X'.
    endif.
    call method g_editable_alv->set_frontend_fieldcatalog
                exporting it_fieldcatalog = lt_fcatfcat.
    call method g_editable_alv->refresh_table_display.
    endform.
    Don't forget to rewaard if useful..

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