Siemens SIMATIC S7-1200 System Manual page 1298

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Communication processor and Modbus TCP

13.10 Industrial Remote Communication (IRC)

Direct communication between stations

In this configuration, two SIMATIC S7-1200 stations communicate directly with each other

using the CP 1242-7 via the GSM network. Each CP 1242-7 has a fixed IP address. The

relevant service of the GSM network provider must allow this.

TeleService via GPRS

In TeleService via GPRS, an engineering station on which STEP 7 is installed communicates

via the GSM network and the Internet with the CP 1242-7 in the S7-1200.

Since a firewall is normally closed for connection requests from the outside, a switching

station between the remote station and the engineering station is required. This switching

station can be a telecontrol server or, if there is no telecontrol server in the configuration, a

TeleService gateway.

Direct communication between two S7-1200 stations

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK