The Full Perimeter Upgrade is for the customer who wants to have the system armed while they are inside and moving about the home. With this option the motion sensor is deleted. If you walked in front of a motion sensor while the system is armed you would trip the alarm. Instead of a motion sensor all first floor and basement windows are protected with window contacts. Motion sensors are fine if your main goal is to provide security when no one is home.
Motion sensors protect property.
Contacting the windows does a much better job if your goal is to provide security when people are home. Home Automation is basically the simplifying of normal, everyday tasks. It basically sends commands through the existing phone and electrical wires to modules at various locations in the home. Every light or appliance you want to control must be attached to one of these modules. The commands can originate from a phone on or off the premises, from a timer built into the alarm system or from an alarm keypad.