Hi,
The only thing you can do is make sure that the ip ranges that you don't want to scan are not included in the ip ranges that you scan.
For example:
You want to scan the following range 192.168.1.1 - 192.168.1.255 but you want to exclude the range 192.168.1.70-192.168.1.75
Then we recommend that you use the following ip ranges:
192.168.1.1-192.168.1.70
192.168.1.75-192.168.1.255