Siemens SIMATIC PCS 7 Function Manual page 132

Advantages of fault-tolerant components
4.4 Distributed I/O
12.Click "Find".
The "Find Redundant Module" dialog box opens.
13.In the "Subsystem" list, select the DP master system in which the redundant signal module
is configured.
All the available PROFIBUS addresses in this DP master system are displayed in the
"PROFIBUS address" box.
14.In the "PROFIBUS address" box, select the IM 153-2 in which the redundant signal module
is configured.
The redundancy-capable signal modules available in this IM 153-2 for which no redundancy
has yet been configured are displayed in the "Redundant module" list.
15.Select the signal module you want to use as a redundant signal module in the "Redundant
module" list.
16.Click "OK" to close the dialog box.
17.In the "Additional parameters" area, make any additional settings required for input modules.
18.Click "OK".
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Fault-tolerant Process Control Systems (V8.1)
Function Manual, 11/2014, A5E34878832-AA