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Getting Real Time Clock Value

asy81
2018-08-14
2018-09-13
  • asy81

    asy81 - 2018-08-14

    Hello,
    I am not so familiar with PLC programs and I decided to start learning CoDeSys with an excellent youtube tutorial. But the very first problem is he is using Beckhoff, so I can not use some libraries and function blocks as he did.
    https://www.youtube.com/watch?v=BMrVOQJJhkg&index=11&list=PLE1CU6EebvTCJCMIUOSWgMseMaW-2k5zH

    While I am trying to get real time values, I used the function block RTCLK.GetDateAndTime. But my problem is I could not figured out a way to get a real time value at second time. I even tried to use add a second function block for solving that but it did not work either. So, what am I missing and what should I do?
    I am adding the project and code below so you can check it.

    FUNCTION_BLOCK FB_PIZZA
    VAR_INPUT
       
       bLoadPizza : BOOL;
       bRemovePizza : BOOL;
       
       
    END_VAR
    VAR_OUTPUT
       
       bBuzzer : BOOL;
       sStateDesc : STRING;
       iTotalPizzasCooked : UDINT;
       fbPizzaTimer : TON;
    END_VAR
    VAR
       
       iState : DINT;
       iLastState : DINT;
       
       arrStateDescHistory : ARRAY [1..100] OF STRING;
       
       stPizzaOnDeck: ST_PIZZA;
       stPizzaInOven: ST_PIZZA;
       stPizzaAtOut: ST_PIZZA;
       fbLoad_RTRIG: R_TRIG;
       fbRemove_RTRIG: R_TRIG;
       
       arrPizzaHistory: ARRAY[0..100] OF ST_PIZZA;
       fbNT_GetTime: RTCLK.GetDateAndTime;
       dtCurrentTime : DT;
          
    END_VAR
    VAR CONSTANT
       standard : RTCLK.SetDateAndTime;
       stNULL_PIZZA : ST_PIZZA;
    END_VAR
    //Structure of ST_PIZZA
    TYPE ST_PIZZA :
    STRUCT
       
       bExist : BOOL;
       dtTimeEnteredOven : DT;
       dtTimeExitedOven : DT;
       tTimeInOven : TIME;
       eType : E_PIZZA_TYPES;
    END_STRUCT
    END_TYPE
    //We can press the button 'Load Pizza' anytime we want and the 
    //first function block(fbNT_GetTime) counts and measure the value how much time after we did hit the button..
    //It gives the true clock value even there exist a time-difference!
    fbNT_GetTime();
    dtCurrentTime := fbNT_GetTime.dtDateAndTime ;
    IF stPizzaOnDeck.bExist AND NOT stPizzaInOven.bExist THEN
       stPizzaInOven := stPizzaOnDeck;
       stPizzaOnDeck := stNULL_PIZZA;
    END_IF
    fbLoad_RTRIG(CLK:= bLoadPizza);
    IF fbLoad_RTRIG.Q THEN
       //bLoadPizza := FALSE;
       stPizzaOnDeck.bExist := TRUE;
       stPizzaOnDeck.eType := 0;
    END_IF
    fbRemove_RTRIG(CLK:= bRemovePizza);
    IF fbRemove_RTRIG.Q THEN
       //bRemovePizza := FALSE;
       F_FIFO_WRITE(cbData := SIZEOF(stPizzaAtOut), pData := ADR(stPizzaAtOut), cbBuffer := SIZEOF(arrPizzaHistory), 
          pBuffer := ADR(arrPizzaHistory));
       stPizzaAtOut := stNULL_PIZZA;
    END_IF
    CASE iState OF
       0:
          sStateDesc := 'Waiting for pizza!';
          IF stPizzaInOven.bExist THEN
             iState := 10;
          END_IF
       10:
          sStateDesc := 'Baking pizza right now!';
          fbPizzaTimer(IN := TRUE, PT:=T#5S);
          fbNT_GetTime.xExecute := TRUE;
          stPizzaInOven.dtTimeEnteredOven := dtCurrentTime;
          
          IF fbPizzaTimer.Q THEN
             fbPizzaTimer(IN := FALSE);
             
             fbNT_GetTime.xExecute := FALSE;
             
             iState := 20;
          END_IF
       20:
          sStateDesc := 'PIZZA BURNING!!';
          IF NOT stPizzaAtOut.bExist THEN
             fbNT_GetTime.xExecute := TRUE;
             stPizzaAtOut.dtTimeExitedOven := dtCurrentTime;
             
             stPizzaAtOut := stPizzaInOven;
             stPizzaInOven := stNULL_PIZZA;
             
             bBuzzer := FALSE;
             iState := 30;
          ELSE
             bBuzzer := TRUE;
          END_IF
       30:
          iTotalPizzasCooked := iTotalPizzasCooked + 1;
          fbNT_GetTime.xExecute := FALSE;
          iState := 0;
    ELSE
       sStateDesc := 'Invalid State!';   
    END_CASE
    //Start state history
    IF iLastState <> iState AND(iState<>30) THEN
       F_FIFO_WRITE(cbData := SIZEOF(sStateDesc), pData := ADR(sStateDesc), cbBuffer :=SIZEOF(arrStateDescHistory), pBuffer := ADR(arrStateDescHistory));
       //Reset for next time.
       iLastState := iState;   
    END_IF
    

    PizzaOven RTC.project [190.93 KiB]

     
  • Andreas-K

    Andreas-K - 2018-09-12

    Hi
    I got the same issue, I only get the time once.

    And here's my code, the counter is increased every 500ms,
    so every 3s I want to read out the actual time and display
    it at the visualization. The code runs in cyclic task with 500ms cycle time.

    For some reasons, I only get in the first cycle a date and time.
    The output dtu_getdt.xDone will not reset even
    if dtu_getdt.Execute is set back from TRUE to FALSE.
    According to the library description the outputs should be reseted upon a
    falling edge. I'm not sure whether this is the reason for executing it only once or not.

    Using Codesys 3.5 SP11 Patch4+
    RaspberryPi Runtime

    VAR
    dtu_getdt : DTU.GetDateAndTime;
    dtDate : DATE_AND_TIME;
    END_VAR

    Codepart:
    IF i_count1 > 5 THEN
    dtu_getdt.xExecute := TRUE;
    dtu_getdt();
    IF dtu_getdt.xError THEN
    ; // Fehlerbehandlung
    END_IF
    IF dtu_getdt.xDone THEN
    // ohne Fehler abgeschlossen
    dtDate := dtu_getdt.dtDateAndTime;
    dtu_getdt.xExecute := FALSE;
    END_IF
    i_count1 :=0;
    END_IF
    i_count1 := i_count1+1;

    Thanks for any comments. I'm not a very experienced user.

     
  • josepmariarams

    josepmariarams - 2018-09-13

    You have to take out dtu_getdt() outside "icount if".

    For the fb icount, execute is never false, because when you set it to false you dont call anymore dtu_getdt since execute be true.

    Be carefull with fb inside ifs, fb are normally though to call it all cycles!

    Sent from my Moto G (5S) Plus using Tapatalk

     

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