Siemens SIMATIC PCS 7 Function Manual page 114

Advantages of fault-tolerant components
4.4 Distributed I/O
Procedure
1. In the component view, select the SIMATIC H station and double-click the "Hardware"
2. If the hardware catalog is not visible, select the menu command View > Catalog.
3. Select the IM 153-2 (ET 200M) in which you want to configure the redundant module.
4. In the hardware catalog, select a signal module that supports redundancy.
5. Repeat steps 3 and 4 for the second signal module.
6. Select the first IM 153-2 again.
7. Double-click on the inserted signal module in the module overview.
8. Open the "Addresses" tab.
9. Select the process image partition in the "Process image" drop-down list.
10.Select the "Redundancy" tab.
11.Select the entry "2 modules" in the "Redundancy" drop-down list.
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object in the detail window.
HW Config opens.
The hardware catalog opens.
The module overview is displayed in the lower window pane.
Drag the signal module to a free slot in the IM 153-2 (lower window pane).
The modules for which redundancy is to be configured are inserted.
The "Properties ..." dialog box for this module opens.
Fault-tolerant Process Control Systems (V8.0)
Function Manual, 03/2012, A5E02779471-02