Siemens SIMATIC S7-400H System Manual page 245

Communication combinations
The following table shows the possible combinations of fault-tolerant connections via
Industrial Ethernet.
Local Local network
connection connection
end point
CPU 41xH V6 CPU-PN-SS
CP443-1 (EX11/20 )
CP443-1 ( X11/20)
CPU 41xH V6 CP443-1 (EX11/20)
PC station CP1623 as of V8.1.2
with Simatic
Net CD
PC station CP1623 as of V8.1.2
with Simatic
Net CD
PC station CP1623 up to V7.x
with Simatic
Net CD
Configuration
The availability of the system, including the communication, is set during configuration. Refer
to the STEP 7 documentation to find out how to configure connections.
Only S7 communication is used for fault-tolerant S7 connections. To set this up, open the
"New Connection" dialog box, then select "S7 Connection Fault-Tolerant" as the type.
The number of required redundant subconnections is determined by STEP 7 as a function of
the redundancy nodes. Up to four redundant connections can be generated, if supported by
the network. Higher redundancy cannot be achieved even by using more CPs.
In the "Properties - Connection" dialog box you can also modify specific properties of a fault-
tolerant connection if necessary. When using more than one CP, you can also route the
connections in this dialog box. This may be practical, because by default all connections are
routed initially through the first CP. If all the connections are busy there, any further
connections are routed via the second CP, etc.
S7-400H
System Manual, 03/2012, A5E00267695-11
14.6 Communication via fault-tolerant S7 connections
Used network Remote
protocol network connection
TCP CPU-PN-SS
TCP CPU-PN-SS
TCP CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11 )
ISO CP443-1 ( EX11 )
TCP CPU-PN-SS
TCP CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11 )
ISO CP443-1 ( EX11 )
ISO CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11/20 )
ISO CP443-1 ( EX11 )
ISO CP443-1 ( EX11 )
Communication
Remote
connection
end point
TCP CPU 41xH V6
TCP CPU 41xH V6
TCP CPU 41xH V6
ISO CPU 41xH V6
ISO CPU 41xH V4.5
ISO CPU 41xH V4.0
ISO CPU 41xH V3.0
TCP CPU 41xH V6
TCP CPU 41xH V6
ISO CPU 41xH V6
ISO CPU 41xH V4.5
ISO CPU 41xH V4.0
ISO CPU 41xH V3.0
ISO CPU 41xH V6
ISO CPU 41xH V4.5
ISO CPU 41xH V4.0
ISO CPU 41xH V3.0
S7 fault
tolerant
connection
via
ISOonTCP
S7 fault
tolerant
connection
via ISO
S7 fault
tolerant
connection
via
ISOonTCP
S7 fault
tolerant
connection
via ISO
S7 fault
tolerant
connection
via ISO
245