<pre>
class Monitor

InputReal x;  // plant output
OutputBoolean y;

Boolean z;
initial equation
y = false;
equation
z = (time > 0) and ((x >= 5) or (x <= 0))  and  ((x >= 15) or (x <= 10)) ;
algorithm
when edge(z) then
y := true;
end when;
end Monitor;
</pre>