TRACE;It is used to put the trace mode that displays a detailed account of the events process, messages movements, FEL evolution, etc., useful for debugging. It must not be executed if the system is displaying a graphic.
This procedure can be used in nodes of any type. It has not effect if used in the INIT.
Example:
IF EL_Shop > 10 THEN TRACE ELSE IF EL_Shop <= 5 THEN UNTRACE;If the queue in Shop is greater than 10 the trace starts, when the queue decreases and becomes 5 or less the trace is stopped.