Siemens SIMATIC S7-1500 System Manual page 141

Station option 2 with subsequently added module
The module present in slot 3 in the station master is added "to the back" of the station option
2 by inserting it as the last module in slot 4.
Adapt the control data record accordingly.
Figure 9-6
Automation system
System Manual, 12/2014, A5E03461182-AC
Example: Hardware configuration of station option 2 with the associated control data
record in STEP 7
Flexible automation concepts
9.2 Configuration control
141