Supplementary information
18.11 Communication via fault-tolerant S7 connections
CPU 410 Process Automation/CPU 410 SMART
332 System Manual, 05/2017, A5E31622160-AC
Communication via fault-tolerant S7 connections
Availability of communicating systems
Fault-tolerant communication expands the overall SIMATIC system by additional, redundant
communication components such as CPs and bus cables. To illustrate the actual availability
of communicating systems when using an optical or electrical network, a description is given
below of the possibilities for communication redundancy.
The essential requirement for the configuration of fault-tolerant connections with STEP 7 is a
configured hardware installation.
The hardware configuration in both subsystems of a fault-tolerant system
be identical.
This applies in particular to the slots.
Depending on the network used, CPs can be used for fault-tolerant and fail-safe
communication, see Appendix Function and communication modules that can be used in a
redundant configuration (Page 389)
Industrial Ethernet with ISO protocol or PROFIBUS without distributed I/O and ISO on TCP
is supported. Fault-tolerant S7 connections via Industrial Ethernet with ISO on TCP are
supported by the integrated PN interfaces and corresponding CPs. You require a suitable
CP for fault-tolerant S7 connections via Industrial Ethernet with ISO protocol or via
PROFIBUS. These connections are not possible via the internal PROFIBUS-DP interface.
Only Industrial Ethernet is supported for connecting to PC stations using fault-tolerant S7
connections. To be able to use fault-tolerant S7 connections between a fault-tolerant system
and a PC, you must install the "S7-REDCONNECT" software package on the PC. The
software is part of the SIMATIC Net CD. As of version 8.1.1, communication over ISO-on-
TCP is also supported. Please refer to the product information on the SIMATIC NET PC
software to learn more about the CPs you can use at the PC end.
Communication combinations
The following table shows the possible combinations of fault-tolerant connections via
Industrial Ethernet.
Local connec-
tion
end point
Local network con-
nection
Remote
network connection
Remote connec-
tion
end point
CPU 410 CPU-PN interface
CP443-1 (EX 20/30)
CP443-1 (EX20/30)
TCP
TCP
TCP
CPU-PN interface
CPU-PN interface
CP443-1 ( EX 30 )
TCP
TCP
TCP
CPU 410
CPU 41xH
V6/CPU 410
CPU 41xH V4.5
and higher/CPU
S7 fault
tolerant
connection
via
ISOonTCP
CPU 410 CP443-1 (EX 20/30) ISO CP443-1 ISO CPU 41xH /CPU
410
S7 fault
tolerant
connection
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