Siemens SIMATIC PCS 7 Function Manual page 42

Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
Network component
Switch (from the
SCALANCE series)
SCALANCE X204 RNA
ESM (Electrical Switch
Module)
OSM (Optical Switch
Module)
Switch (from the
SCALANCE series)
OLM (Optical Link Module) Fieldbus
42
Bus system Application
Terminal bus Type-specific use in network setup
Plant bus Selected SCALANCE X components enable the
following:
● Transmission rates up to 1 Gbps
● Media converter (electrical/optical
● Function as redundancy manager
● Function as standby manager (redundant
Depending on the type, either optical or electrical
connections are used.
Terminal bus Connecting a singular infrastructure component
to the redundant terminal bus. For example:
● SICLOCK TC400
● Domain controller
● File server
2 ports for the infrastructure components
Terminal bus Setup of electrical bus systems
Plant bus (suitable as redundancy manager)
The connection to the ESMs is electrical.
Terminal bus Setup of optical bus systems
Plant bus An optical ring must be configured with at least
two optical switch modules.
(suitable as redundancy manager)
The connection to the OSMs is electrical or
optical.
Fieldbus ● Fieldbus as fault-tolerant PROFINET ring
● PROFINET
Setup of optical transmission paths
● PROFIBUS DP Configuration variants:
● DP master (electrical) > OLM > FO > OLM >
● DP master (electrical) > OLM > FO >
bidirectional)
(configuration of ring redundancy)
linking of networks)
interface module (electrical connection)
interface module (optical connection)
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02