Siemens SIMATIC PCS 7 - Redundant, High Availability Terminal Bus

Availability
If there is a fault in a ring line, the communication between clients and servers via the switches
remains unaffected. However, if one of the switches fails, the link between the connected OS
servers and the OS clients is interrupted. To increase the high availability even more, however,
the redundant ring described in the following section can be used.
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Additional information
● Manual
SIMATIC Net Twisted Pair and Fiber-Optic Networks
● Operating instructions SIMATIC NET; Industrial Ethernet Switches SCALANCE X-400
● Operating instructions SIMATIC NET; Industrial Ethernet Switches SCALANCE X-300
● Operating instructions SIMATIC NET; Industrial Ethernet Switches SCALANCE X-200
4.3.3.3 Redundant, high availability terminal bus
Functionality
The terminal bus connects the servers (OS servers, BATCH servers, Route Control servers)
etc. with the clients of the process control system (OS clients, BATCH clients, Route Control
clients).
The following solutions for a redundant, high availability terminal bus is offered:
● Redundant, high availability terminal bus based on the Parallel Redundancy Protocol
(PRP) (Page 64)
Separate double ring with PRP; solution in accordance with IEC 62439-3)
High availability solutions in PCS 7
4.3 Solutions for communication
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 63