Siemens SIMATIC S7 - Searching for Cpus and Devices on Your RS485 Network

Communication
8.6 RS485
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
457
8.6.4.2
Searching for CPUs and devices on your RS485 network
You can search for and identify the S7-200 SMART CPUs that are attached to your RS485
network in the "Communications" dialog. To access this dialog, click one of the following:
"Communications" button in the navigation bar
"Communications" in the project tree
"Communications" from the "Component" drop
-down list in
the Windows area of the "View" menu ribbon strip
The "Communications" dialog autodetects all connected and available
S7-200 SMART CPUs on a given RS485 network by creating a lifelist. (See the figure
below.) After selecting a CPU, the dialog lists the following detailed information about the
CPU:
● RS485 port address
● RS485 network baud rate
The STEP 7-Micro/WIN SMART project includes all added CPUs. However, opening a
STEP 7-Micro/WIN SMART project does not automatically select an RS485 network address
or establish a connection to a CPU. Every time you create a new or open an existing
STEP 7-Micro/WIN SMART project, you must go to the Communications dialog to establish
a connection to a CPU. The Communications dialog will show the last selected CPU.