Configuring Networks; Downloading The Network Configuration To The Fault-Tolerant Station - Siemens SIMATIC S7-400H Manual

9.2.5

Configuring Networks

The fault-tolerant S7 connection is a separate connection type of the "Configure
Networks" application. The following communication peers can communicate with
each other:
S S7 fault-tolerant station (with 2 fault-tolerant CPUs)–>
station (with 2 fault-tolerant CPUs)
S S7 400 station (with 1 fault-tolerant CPU)
2 fault-tolerant CPUs)
S SIMATIC PC stations
fault-tolerant CPUs)
Fault-tolerant connections are only permissible if at least one communications
terminal is an S7 fault-tolerant station.
When this type of connection is being configured, the application automatically
determines the number of possible connection paths:
• If two independent but identical subnets are available which are both suitable
for an S7 connection (DP master systems), two connection paths will be used.
In practice these are generally electrical networks, each a CP in a subnet:
• If only one DP master system is available – in practice typically fiber-optic
cables – four connection paths are used for a connection between two
fault-tolerant stations. All the CPs are in this subnetwork:

Downloading the network configuration to the fault-tolerant station

The network configuration can be downloaded to the entire fault-tolerant station in
one go. To do this, the same requirements must be met as for downloading the
network configuration to a standard station.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
–> S7 fault-tolerant station (with
–> S7 fault-tolerant station (with 2
Configuring with STEP 7
S7 fault-tolerant
9-7