New PLCs come with no IP Address. Is this truly new, out of the box, or just new to you (i.e. it may already have an IP Address)?
What Network Adapter(s) do you have selected? There is a button on the bottom of the Connect dialog. Type in all the information here or just take a screen shot of it by selecting that dialog, hitting Alt+PrtScrn, then paste it in Paint, save it as a file, then add it as an attachment to your reply here. That should give us enough detail about your networkless computer.