VT10OnChVar

V = Variables

T = Control functions

The VT10OnChVar function checks the value of a variable and set a flag if the value changes.

IMPLEMENTATION

VT10OnChVar (var01, changed)

Parameters:

IN/OUT	VARIABLE TYPE	EXAMPLE NAME	DIM
IN	SYSTEM / INPUT / OUTPUT	var01	F/L	Variable to check
OUT	GLOBAL	changed	F	Change execute flag

In the example, if the 'pippo' variable change its value output is activated the 'ofUscita' output.

VT10OnChVar (pippo, changed)

IF changed
	changed = 0
	SETOUT ofUscita
ENDIF

To be effective, the function should be placed at a point of the application that runs on every logical round.
The flag that signals the change must be reset externally to the function.