Configuring Hardware and Communication Connections STEP 7.pdf

Configuring Connections
Case 2: Configuration with non-redundant H-Station (local) and redundant H-
Station (remote)
In this case, there is a difference whether the redundant partner station is fitted
with a total of two or four CPs.
If the partner station is fitted with a total of two CPs, then one connection resource
is reserved on the local H-CPU and two connection resources are reserved on the
local CP.
If the partner station is fitted with a total of four CPs and the "Enable max. CP
redundancy" option was selected, then a total of four connection paths is possible.
Even so, one connection resource is reserved the local H-CPU, and two
connection resources are reserved for the local CP. The reason for this is that a
maximum of two partial connections can be active.
(1) Partial connection
(2) Fault-tolerant S7 connection
Configuring Hardware and Communication Connections with STEP 7
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