Siemens SIMATIC ET 200AL System Manual page 79

Extension by a station option
The following figure shows the configuration with the Station options 2 and 4 that has
subsequently been extended by the Station option 3.
The modules of option 3 are added to the modules already existing.
Figure 7-7
Distributed I/O system
System Manual, 08/2021, A5E31861578-AJ
Example: Hardware configuration of station option 2 to 4 with the associated control data
record in STEP 7
Configuration control (option handling)
7.3 Creating the control data record
77