Siemens SIMATIC ET 200SP System Manual page 164

Configuration control (option handling)
9.5 Examples of configuration control
Station option 1 with module that is not present
The module that is located in slot 3 in the station master is not present in the station option 1.
Slot 3 must be designated in the control data record accordingly with 0 (= not present). The
server module is located in slot 3 in the station option.
Figure 9-6
164
Example: Hardware configuration of station option 1 with the associated control data
record in STEP 7
Distributed I/O system
System Manual, 12/2015, A5E03576849-AF