Once the machine gets started, after 30 minutes it has to check the pressure value weather it is less than 100. If not it has to trigger the alarm (the value of pressure decreasing constantly)
Variables:
1. machine start - boolean (1&0)
2. pressure - number
3. alarm- boolean (1&0)
In Thingworx there are Timers and Schedulers that you could utilize for this.
Let's say you set a one minute timer, that runs and checks if 30 minutes have passed.
if 30 have passed then do the evaluation you need.