Siemens SIMATIC PCS 7 - Page 96

Redundancy connection
You need the following components to make the redundancy connection, depending on the
distance to be bridged:
Maximum distance Required components Connection
10 m Null modem cable Serial connection
100 m
● Crossover network cable
● Per server: A free network connection (see
section "Network components (Page 56)")
Ethernet connection
1000 m Fiber-optic cable
Per server:
● A free network connection
(see section "Network components
(Page 56)")
● 1 Ethernet cable
● 1 media converter
(e.g., SCALANCE X101-1)
Ethernet connection
Availability
The availability of the complete system is ensured even if one of the two OS servers fails
because the two OS servers form an independent redundancy node.
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26VHUYHU
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Note
The buses marked with * (terminal bus and plant bus) can be configured redundantly with
optical or electronic switch modules.
Additional information
● Section "Network components (Page 56)"
● Section "How to configure an OS server and its redundant OS partner server (Page 152)"
● Online help for
WinCC ; WinCC Redundancy
● Documentation on the Process Historian
High availability solutions in PCS 7
4.5 Solutions for OS servers
High Availability Process Control Systems (V9.0)
96 Function Manual, 05/2017, A5E39221836-AA