During the time my PR application was under process (a long 4 years) , my elder son applied for and received a student pass and my self, my wife and younger son applied for and received 2 year multiple entry visit visas to visit the elder son.
As long as you provide the documents required to issuance of a visit pass, a pending PR application is not an issue. The most important thing is never to be secretive about your PR application. The moment they input your details, they know about your PR application. State the PR application reference on your visit visa application. If the the immigration officer at the entry point asks you whether you have applications under process, say YES.
Good luck.