To guard against the failure of all switches, however, the redundant double ring described in
the following section can be used.
+6\VWHP3DUW
+6\VWHP3DUW
26VHUYHU
26VHUYHU
%XV
%XV
%XV
&3
&3
&3
&3
Additional information
● Section "How to configure a high availability plant bus (Page 117)"
● Manual
SIMATIC Net Twisted Pair and Fiber-Optic Networks
● Manual
SIMATIC; Communication with SIMATIC
● Operating instructions
SIMATIC NET; Industrial Ethernet Switches SCALANCE X-400
4.3.4.3 Redundant, high availability plant bus
Functionality
The plant bus connects automation systems to servers (OS server, Route Control server). The
connection to a redundant, high availability plant bus is implemented with Ethernet
communication processors (CPs) that are installed in each subsystem of the automation
system and in the servers.
A redundant, high availability plant bus is set up using two identical, separate plant bus rings
(double ring). The network components ensure unrestricted operation of the plant bus. If one
of the plant buses fails, communication is maintained over the second plant bus.
Redundant communication solutions
The following communication solutions are offered to prevent a possible failure:
● Redundant electrical or optical network with switches set up as Industrial Ethernet
● Combined redundant network with switches, FO cables and electrical connection
● Ring structures can be set up based on modular switches from the SCALANCE series.
(Can be implemented as optical, electrical and combined networks)
The use of switches from the SCALANCE series is recommended. Modules for optical and
electrical connection are available for these switches. You can find additional information on
the switches used with PCS 7 in the "Network components (Page 56)" section.
High availability solutions in PCS 7
4.3 Solutions for communication
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 71
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