AuCom PROFINET CARD Instructions Manual page 22

INSTRUCTIONS
8.3 Ring topology
In a ring topology network, the controller connects to the first card, via a network
switch. The second Ethernet port of the card connects to another device, which in turn
connects to another device until all devices are connected. The final device connects
back to the switch.
The device supports beacon based ring node configuration with MRP (media
redundancy protocol).
NOTE
The network switch must support loss of line detection.
8.4 Combined topologies
A single network can include both star and line components.
22 Profinet Card (710-16502-00C)