Siemens SIMATIC S7-400H - Figure 13-5 Redundant I;O in the Switched DP Slave

Using I/Os in S7–400H
13.4 Connecting redundant I/O to the PROFIBUS DP interface
S7-400H
180 System Manual, 03/2012, A5E00267695-11
3. Redundant I/O in the switched DP slave
To achieve this, the signal modules are installed in pairs in ET 200M distributed I/O
devices with active backplane bus.
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Figure 13-5 Redundant I/O in the switched DP slave