PROFIBUS DP Communication
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Since the S7‑1200 CPU has no PROFIBUS interface, you need to add a PROFIBUS
communication module. In this example, a CM1243‑5 master module is added.
After adding the PROFIBUS master module, click Network view. Select the
communication module, click Properties and then General, and click Add new
subnet to create a PROFIBUS network. You can modify the master number here.
To modify the PROFIBUS baud rate, select the network in the view, and choose
General > Network settings on the Properties tab page, and select a proper baud
rate from the Transmission speed drop‑down list.