Maybe because the PLC5 Channel 1B RIO Scanner "Auto-Configure" feature (which I have personally never used, especially on an existing RIO network!) does not apply to HMI applications which are not I/O "Racks" connections requiring the said "I/O Status".
Is it a PanelView Standard or PanelView Plus?
Usually the RIO comms settings are entered within the HMI's Configuration Mode, Communications Setup interface and consist of:
-Rack Number
-Rack Size
-Starting Group
-Pass-through Enable/Disable (for PLC5 and SLC controllers)
-Last Chassis
-Baud Rate
The communications settings are also included within the PB32 application files running on PanelView Standars terminals.