Siemens SIMATIC NET SCALANCE X-200RNA Operating Instructions Manual page 21

There are already end devices equipped with two Ethernet interfaces that are capable of
handling the "Parallel Redundancy Protocol" (Double Attached Nodes PRP = DANP).
On the other hand, there are many end devices starting with S7 controllers right through to
control computers that communicate using TCP/IP but do not support PRP, and some even have
only one Ethernet Interface. With all these devices, a SCALANCE X-200RNA can be connected
upstream from them. This allows access for Single Attached Nodes (SAN) to PRP networks.
Industrial Ethernet bus (linear), star or ring structures with switching functionality can be
implemented cost-effectively with devices of the SCALANCE X product line. You will find a list of
usable network components in "Accessories and compatible devices (Page 153)".
SCALANCE X-200RNA
Operating Instructions, 04/2022, C79000-G8976-C342-07
Network topologies and redundancy
4.1 PRP
21