Scheduled Cicode

Hi;

I want a function in Cicode to run continuously for a time period that I set. For example, the code I wrote will run every 20sec in the background . How do I make this application?

I am using Power Scada Operation to develop my project.

The function will be as follows;

/////////////////////////////////////////////////////////////
FUNCTION
Schedule()
INT nIntTagValue;
WHILE 1 DO
nIntTagValue = TagRead("VALUE");
nIntTagValue = (nIntTagValue/2) * 3;
TagWrite("VALUE_CALC", nIntTagValue);
END
END
/////////////////////////////////////////////////////////////

Thank you for your reply.