Yes, to do this the PLCs on the network must all use the same protocol. When setup, the HMI project will automatically search for another PLC when communication is lost from a PLC that had previously established communication.
If no PLC has communication established when the project is originally downloaded, the HMI project will not automatically search for another PLC.
See Tech Note 5081, “Auto-Switching Between PLCs.”
Software Downloads & Upgrades
Manuals & Guides
Tech Notes
Videos
Sample Projects
Controller Information Sheets
Communication Cables