Travel Overseas while on a Permanent Residency visa.
Do you need an Australian RRV?
From the date that your Permanent Residency visa was granted you can travel in and out of Australia as many times as you want for a period of 5 years.
It is expected that most people that intend to stay permanently in Australia will become Australian citizens during that time.
Australian RRV
However, for those who do not, they can renew the overseas travel part of their residence visa by applying for an Australian RRV, (Resident Return visa subclass 155 or 157) to re-enter Australia as a permanent resident.