The panelview plus uses something Rockwell calls rslinx enterprise. The easiest way to setup your communications is to have a link to your processor on your development computer and use that to point to. I have been meaning to do some videos on this, but this work stuff keeps getting in the way...
When you open up your application, go all the way to the bottom (almost)of your explorer window and you should see RSLinx Enterprise. Expand that and click on communication setup. From there you can add a device shortcut and point to it on the right. There are two tabs on the right. Design and Runtime. If your access to the device is the same for your design computer as your runtime computer (recommended) then you can just click on the PLC you want to access and click the 'copy from design to runtime' button. when you create a tag in design, you will use the device shortcut you created as a prefix to your tags. checkout the help for the exact format or you can actually drill into your online or offline logix application to grab a tag that way. The design software gives you the capability to test your app so design a little and test - repeat. Every so often actually download to your hardware and test there. There are some differences as to how things will appear on the pv+ hardware.