Siemens SCALANCE X308-2M Operating Instructions Manual page 36

Network topologies
3.3 Ring with redundancy manager
Configuration example
Sample configurations with IE Switch X-300, SIMATIC S7-200/300/400, operator control and
monitoring system, H system, and PC as end devices.
Figure 3-3
Figure 3-4
36
Gigabit ring with redundancy manager (RM)
Ring with FO cable and redundancy manager
Operating Instructions, 02/2012, A5E01113043-12
SCALANCE X-300