Siemens SIMATIC PCS 7 Function Manual page 60

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
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.
The following switches can be used:
● Switches of the SCALANCE series
● OSM (optical signal cables)
● ESM (electrical signal cables)
You can find additional information on the switches used with PCS 7 in the "Network
components (Page 41)" section.
Configuration - redundant, fault-tolerant plant bus
The figure below shows the basic structure of the redundant, fault-tolerant plant bus.
● Bus1 shows the functionally correct structure (shared switches for AS and OS).
● Bus2 shows the typical structure in PCS 7 plants (separate switches for AS and OS).
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(Can be implemented as optical, electrical and combined networks)
Modules optical or electrical connection are used for the connection
The connection to the OSMs is electrical or optical.
The connection to the ESM is electrical.
Note
Check the redundancy behavior of the individual components during commissioning.
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02