Configuring Hardware and Communication Connections STEP 7.pdf

Configuring Connections
Case 3: Configuration with redundant H-stations (local and remote), four partial
connections possible
If redundant H-stations are connected in a subnet, then a maximum of four partial
connections is possible. One connection resource is reserved for each of the H-
CPUs, and two connection resources are reserved for each of the CPs involved
The following partial connections are possible:
From H-CPU0/CP0 (local station) to CP0 /H-CPU0 (partner station)
From H-CPU1/CP1 (local station) to CP1 /H-CPU1 (partner station)
From H-CPU0/CP0 (local station) to CP1 /H-CPU1 (partner station)
From H-CPU1/CP1 (local station) to CP0 /H-CPU0 (partner station)
(1) Partial connection
(2) Fault-tolerant S7 connection
Case 4: Configuration with non-redundant H-Station and two CPs (local) and a
redundant H-Station (remote)
If the local station is fitted with a total of two CPs, then one connection resource is
reserved on the local H-CPU and one connection resource is reserved on each of
the local CPs.
(1) Partial connection
(2) Fault-tolerant S7 connection
Configuring Hardware and Communication Connections with STEP 7
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