The first challange is to get the Omron PLC onto ethernet, then to a wireless, through an access point. I am assuming the Pocket PC has a wireless card in it and has a CE operating system. When you get connected, are you wanting to view data which you would need a CE based Human Machine Interface and use Active-Sync to put in on your PC. Or if you wanted to program in Visual C you could create your own. If you want to program over a CE device, you would have to have compatable programming software, which as far as I know, is still not available.
What ever way you try to connect, it will not be easy.