what you need to do:
If weekday = monday or weekday = tuesday or weekday = wednesday or weekday = thursday
do
if hour = 6 and minute =0 or hour = 9 and minute = 30 or hour = 15 and minute = 15
do
set sirena attribute to ON
else
else
this is basicly what you need to see on your screen with the different block, unfortunately i can’t do it myself to give you a screen shot.