Siemens SIMATIC S7 System Manual page 456

Communication
8.6 RS485
For "Added CPUs" (CPUs on the RS485 network), use the "Communications" dialog to
connect with your CPU:
● Click the "Communication Interface" dropdown list, and select "PC/PPI cable.PPI.1" for
your RS485 network.
● Click the "Add CPU" button, and enter the following access information for a CPU that
you wish to access directly on the RS485 network:
– RS485 network address
– RS485 network baud rate
You can add multiple CPUs on the RS485 network. As always, STEP 7-Micro/WIN
SMART communicates with one CPU at a time. All CPUs default their RS485 network
settings to address 2 and 9.6 Kbps.
● Highlight a CPU, and then click "OK".
456
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART