Siemens SIMATIC S7-400H - Other Options for Connecting Redundant I;Os

Using I/Os in S7–400H
13.5 Other options for connecting redundant I/Os
S7-400H
System Manual, 03/2012, A5E00267695-11
207
13.5 Other options for connecting redundant I/Os
Redundant I/O at user level
If you cannot use the redundant I/O supported by your system (section Connecting
redundant I/O to the PROFIBUS DP interface (Page 177)), for example because the relevant
module may not be listed
among the supported components, you can implement the use of
redundant I/O at the user level.
Configurations
The following redundant I/O configurations are supported:
1. Redundant configuration with one-sided central and/or distributed I/O.
For this purpose, one signal module each is inserted into the CPU 0 and CPU 1
subsystems.
2. Redundant configuration with switched I/O
One signal module each is inserted into two ET 200M distributed I/O devices with active
backplane bus.
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Figure 13-13 Redundant one-sided and switched I/O
NOTICE
When using redundant I/O, you may need to add time to the calculated monitoring times;
see section Determining the monitoring times (Page 159)