Communication Via Fault-Tolerant S7 Connections - Siemens SIMATIC PCS 7 CPU 410-5H System Manual

15.10

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.
Requirement
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 must 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 335)
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. Communication via ISO on TCP is also
supported as of version 8.1.2. 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.
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
15.10 Communication via fault-tolerant S7 connections
Supplementary information
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