class Monitor

InputReal x, y;  // plant output
OutputBoolean wy;

Boolean wz;
initial equation
wy = false;
equation
wz = (time > 10) and (x >= 10) and (x <= 20) and ((y < 0.5*x) or (y > 0.7*x)) ;
algorithm
when edge(wz) then
wy := true;
end when;
end Monitor;