Supplementary information
16.4 Configuring with STEP 7
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
221
The fault-tolerant S7 connection is a separate connection type of the "Configure Networks"
application. It permits that the following communication peers can communicate with each
other:
● S7–400 fault-tolerant station (with 2 fault-tolerant CPUs)->S7–400 fault-tolerant station
(with 2 fault-tolerant CPUs)
● S7–400 station (with 1 fault-tolerant CPU)->S7–400 fault-tolerant station (with 2 fault-
tolerant CPUs)
● S7–400 station (with 1 fault-tolerant CPU)->S7–400 station (with 1 fault-tolerant CPU)
● SIMATIC PC stations > S7–400 fault-tolerant station (with 2 fault-tolerant CPUs)
When this connection type is configured, the application automatically determines the
number of possible connecting paths:
● If two independent but identical subnets are available and they are suitable for an S7
connection, two connecting paths are used. In practice, they are usually electrical power
systems, one CP in each subnet:
● If only one subnet is available, four connecting paths are used for a connection between
two fault-tolerant stations. All CPs are in this subnet:
Downloading the network configuration into a fault-tolerant station
The complete network configuration can be downloaded into the fault-tolerant station in one
operation. The same requirements that apply for downloads into standard stations must be
met.
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