Siemens Simatic S7 Series System Manual page 380

Communication
8.5 PROFIBUS
32 Bytes In/Out and 8 Bytes In/Out configuration
In this example, slot one contains the "32 Bytes In/Out" pre-configured I/O selection, and slot
two contains the "8 Bytes In/Out" pre-configured I/O selection.
In the "Properties"", "General" tab area navigation, click on "Device-specific parameters" to
display the "I/O Offset in the V memory" field. Here, you can assign the starting address of
the section of V memory reserved for this operation.
380
System Manual, 09/2015, A5E03822230-AC
S7-200 SMART