Knowledge Base

If another function of the same program requests to be run.

The function is put in a queue.

If a function of another program requests to be executed.

The function is put in a queue.

When a SCADA Basic function is running with a DELAY instruction:

The Delay instruction blocks the function that is running and transfers execution to the next function in the queue.

If a function of the same program requests to be run.

This function is not run and the request is discarded.

If a function of another program requests to be run.

The function is queued; so if it is at top of the queue it is run at once.

Edit 30/03/2022:

To replace the DELAY statement, you need to split your function into 2 functions. Here is an example, FunctionWithoutDelayInside and Function2 are replacirg FunctionWithDelayInside :

Sub FunctionWithDelayInside() 

    MyVar = 2 ; 

    DELAY(1) ; 

    Print(MyVar) ; 

End Sub 

Sub FunctionWithoutDelayInside() 

    MyVar = 2 ; 

    Cyclic(“ADDPROG”, 1, “PROGLOADED.SCB”, “”, “Function2”);‘Function2 will start in 1 second 

End Sub 

Sub Function2() 

    Cyclic(“DEL_EX”, 1, “PROGLOADED.SCB”, “”, “Function2” );‘Important to delete this Cyclic 

    Print(MyVar) ; 

End Sub