Siemens SIMATIC S7-400H System Manual page 129
Fault-tolerant systems
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3. Redundant I/O in the switched DP slave
Figure 10-4
S7-400H
System Manual, 09/2007, A5E00267695-03
To achieve this, the signal modules are installed in pairs in ET 200M distributed I/O
devices with active backplane bus.
Redundant I/O in the switched DP slave
Using I/Os in S7-400H
10.5 Connecting redundant I/Os
129
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