Siemens Simatic PCS 7 Function Manual page 75

Note
Address areas and IP addresses of the components on the plant bus
Always assign IP addresses in different IP address ranges to the network adapters (separate
address range for Bus1 and separate address range for Bus2).
Example:
● Ring 1:
– IP address area: 192.168.1.0 - 192.168.1.255
– Subnet mask: 255.255.255.0
● Ring 2:
– IP address area: 192.168.2.0 - 192.168.2.255
– Subnet mask: 255.255.255.0
Availability - high availability available plant bus
The block diagram for a redundant, high availability plant bus with a CPU 410H and two CPs
in the OS server is shown below:
In this system, one CP 16x3 or one subsystem of the AS can fail in the OS server without
affecting the overall system. The plant bus (bus) is configured redundantly and with redundant
switches in each case. As a result, a failure of the bus component and all components involved
(switches) is covered.
Additional information
● Manual
● Section "How to add a SIMATIC H station to your project (Page 108)"
● Manual
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA
SIMATIC; PCS 7 Process Control System; CPU 410-5H Process Automation
SIMATIC; Automation System S7-400H; High Availability Systems
High availability solutions in PCS 7
4.3 Solutions for communication
75