task ALARM is
task body ALARM is
The above code shows that whether an operator is awake or not. If the operator is awake, then the AWAKE button is pressed every 50 sec. if not, the after a delay of 50 seconds, an ALARM will be sounded indicating the operator is away or AWAKE button is not pressed.
If the operator pressing the AWAKE button at 0 seconds or even at 49 seconds, the SIGNAL_ALARM procedure wont be executed at all. because the AWAKE button should be pressed once every 50 sec.