4.3.1 Network components
Introduction
Local networks (LAN) form the basis of the communication system. The following are options
that can be implemented based on the specific system requirements:
● Electrical
● Optical
● Optical/electrical (mixed operation)
Overview of the network components
You can set up bus systems with the following link and switch modules of SIMATIC NET.
Network component Bus system Application
Switch
(SCALANCE series)
Terminal bus
Plant bus
Type-specific use in network setup
Selected SCALANCE X components enable the
following:
● Transmission rates up to 1 Gbps
● Media converter (electrical/optical
bidirectional)
● Function as redundancy manager
(configuration of ring redundancy)
● Function as standby manager (redundant
linking of networks)
Depending on the type, either optical or electrical
connections are used.
SCALANCE X204 RNA
(communication on the ba‐
sis of the Parallel Redun‐
dancy Protocol - PRP)
Terminal bus Connecting a singular infrastructure component
to the redundant terminal bus. For example:
● A master clock for a system, e.g.
SICLOCK TC400
● domain controller
● File server
Ports:
● 2 ports for the infrastructure components
● 2 ports for the connection to the redundant
terminal bus (LAN A and LAN B)
Switch
(SCALANCE series)
Fieldbus
● PROFINET
● Fieldbus as high availability PROFINET ring
OLM (Optical Link Module) Fieldbus
● PROFIBUS DP
Setup of optical transmission paths
Configuration variants:
● DP master (electrical) > OLM > FO > OLM >
interface module (electrical connection)
● DP master (electrical) > OLM > FO >
interface module (optical connection)
High availability solutions in PCS 7
4.3 Solutions for communication
High Availability Process Control Systems (V9.0)
56 Function Manual, 05/2017, A5E39221836-AA
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