Is it a VersaMax modular PLC or a Micro?
If it's a Micro, the inputs on the base unit start a %I0001 and the outputs start at %Q0001. If you add any expansion modules, you have to assign addresses to them in hardware configuration.
If it's a modular unit, you have to assign all I/O addresses in hardware configuration. The I/O address is not determined by physical location.