Only send 1 alert during certain time period

Hi Guys

Looking for some suggestions.

I have a perimeter sensor (using Fibaro Universal sensor). When perimeter is tripped i have a tab chime in the hallway, using Vera alerts, this is nice to have as someone approaches the house and works ok. My problem is i’d only like it to send alerts once every 2 minutes for example, to avoid multiple alerts when i’m going in and out to the car.

I’ve tried PLEG but can’t figure out the logic required, i had been trying something along the lines of ((NOW - lasttrip) >= 120), where lasttrip is the timestamp from Fibaro universal sensor.

Any ideas how i could go about this?