Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual page 29

Telecontrol communication - wireless network
In this example, the S7 stations communicate with the master station via an IP-based private
wireless network. For this application, suitable IP-based wireless devices must be used.
The CPs are connected via their Ethernet interface. In this configuration as well, an Ethernet
network needs to be configured in STEP 7 V5.
Figure 1-5
Communication via an analog wireless network with communication according to the RS-232
standard is also possible. In this case, the CP 1243-8 would need to be connected to the
wireless device via a TS module RS-232. In this configuration a dedicated line network
would need to be configured in STEP 7 V5.
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
Communication via an IP-based private wireless network
Application and functions
1.9 Configuration examples
29