Siemens SIMOCODE pro Programming And Operating Manual page 27

At SIMOCODE pro V PN Device:
Similarly "Transmission medium" should be automatic and "Monitor" checkbox needs to
activated for Port1 and Port 2 of all the SIMOCODE pro V PN devices connected in
redundant configuration.
Figure 1-10 System Redundancy (S2) configuration
SIMOCODE pro PCS 7 Library V9.0
Programming and Operating Manual, 06/2017, A5E40899442002A/RS-AA/001
Introduction
1.7 Example configurations
27