Using I/Os in S7–400H
13.4 Connecting redundant I/O to the PROFIBUS DP interface
S7-400H
System Manual, 03/2012, A5E00267695-11
185
The valid values that can be processed by the user program are always located at the lower
address of both redundant modules. This means that only the lower address can be used for
the application; the values of the higher address are not relevant for the application.
Note
Use of FB 450 "RED_IN" and 451 "RED_OUT" when using process image partitions
For each priority class used (OB 1, OB 30 ... OB 38), you must use a separate process
image partition.
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