Siemens SIMATIC PCS 7 Function Manual page 65

AS 41xH on redundant, fault-tolerant plant bus
You may connect one redundant AS per CPU without redundant communication modules.
Connection possibilities:
● Single connection of an AS 41xH with one CP each per CPU. Availability is then reduced
accordingly.
● Single connection of an AS 41xH via an internal Ethernet interface of the CPU. Availability
is then reduced accordingly.
● Redundant connection of an AS 410H via internal Ethernet interfaces of the CPU
AS 410 on redundant, fault-tolerant plant bus
An AS 410 can be connected to the redundant, fault-tolerant plant bus without communication
modules. You can find additional information on this in the section "AS 410H on redundant,
fault-tolerant plant bus (Page 66)".
Availability - redundant, fault-tolerant plant bus
The block diagram for a redundant, fault-tolerant plant bus with two CPs each in both OS
servers and additional switches appears as follows:
In this system, one CP 16x3 can fail in each OS server or one CP 443‑1 in each subsystem
of the AS without this affecting the complete system. The plant bus (bus) is configured
redundantly and with redundant switches in each case. As a result, a failure of the bus
component and all components involved (switches) is covered.
Additional information
● Section "Connecting PC stations to the plant bus (Page 60)"
● Section "Media Redundancy Protocol (Page 49)"
● Section "How to configure a fault-tolerant plant bus (Page 112)"
● Documentation
● Manual
● Operating instructions
● Manual
Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA
PCS 7 Released Modules
SIMATIC Net Twisted Pair and Fiber-Optic Networks
SIMATIC NET; Industrial Ethernet Switches SCALANCE X-400
SIMATIC Communication with SIMATIC
Fault-tolerant Solutions in PCS 7
3.3 Solutions for communication
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