what is the delay time of an alias signal

svoldgaard

I have an alias signal, that I set in rapid.
I needs to be sure, that the signal is set, so another task can response to it, before continue in the current task.

What is the delaytime, before the other task can read the value of the signal and can I use:

            Set sdoBlockMag;

            WaitDO sdoBlockMag,1;    

            bLidReady{MagNo}:=FALSE;
and be sure, that "bLidReady{MagNo}:=FALSE;" is not executed, before another task can see the updated value of sdoBlockMag?

lemster68

Have the other task set a signal acknowledging that it sees the change of state.  Or use TestAndSet function for boolean flag.

ko414du4

I would perhaps use traps in the other task to monitor sdoBlockMag and set a bool variable that is shared between task:

TASK 1:
  PERS bool bBlockMag; ! This is the shared variable between tasks

  PROC rMyProc
    bBlockMag:=FALSE; ! Reset shared var to ensure fresh update from TASK 2
    Set sdoBlockMag;
    WaitUntil bBlockMag;
    bLidReady{MagNo}:=FALSE;
    bBlockMag:=FALSE; ! Reset shared var to avoid wrong logic going forward
  ENDPROC



TASK 2:

    LOCAL VAR intnum iMonitorBlockMag;

    PERS bool bBlockMag:=FALSE; ! This is the shared variable between tasks

    

    

    PROC rConnectTrap()

        IDelete iMonitorBlockMag;

        CONNECT iMonitorBlockMag WITH tBlockMag;

        ISignalDO sdoBlockMag,1,iMonitorBlockMag;

    ENDPROC

    

    TRAP tBlockMag
        ! ..............
        ! Do your logic here
        ! .................

        bBlockMag:=TRUE;

    ENDTRAP