BigMac:
This is the way SLC family has been designed: you can reference only those inputs and outputs that are physically present and had been configured in your system ("real" I/O, as you call it). You cannot reference anything that does not physically exist - this would cause an error.
This is different from many other PLC brands; Omron, for example, allows you to use the whole range of I/O points to your pleasure, regardless of the fact if anything from the real world is connected to them. As a matter of fact, there is no clear distinction between the I/O memory and internal memory in Omron world. So are many others, and PLC5 is presumably among those.
But SLC is not. So anything that does not exist must be outside of I and O - use B's and N's as much as you want.
Why would you want your RSView app to reference non-existing I/O points anyway?
P.S. I feel some scent of Eastern Europe in your English, am I correct?