Communications Services - Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual

Application and functions

1.3 Communications services

1.3 Communications services
The following communications services are supported:
Telecontrol communication
The CP is the communications processor for connection of the SIMATIC S7-1200 via public
or private infrastructures to a telecontrol master station. You will find the possible application
of the telecontrol master station in the section Properties of the CP (Page 11).
The telecontrol protocol "ST7"
For telecontrol communication, the CP uses the ST7 protocol on the application layer (OSI
layer 7) for communication via different telecontrol networks.
Functions and services of the telecontrol protocol
● Communication with the control center
An S7-1200 station with a CP 1243-8 IRC communicates via LAN/WAN with the master
station.
● SMS / E-mail
Event-driven, the CP can send SMS messages to mobile telephones and e-mails to PCs
with an Internet connection.
– SMS messages can be sent if the CP is connected to a mobile wireless network via
– If the CP is connected, e-mails can be sent via the Ethernet interface.
Both types of messages are configured in telecontrol communication in STEP 7 Basic.
The use of program blocks is not necessary here. For information on the configuration,
see section Message configuration (Page 163).
● Inter-station communication
In dedicated line networks and with communication via the mobile wireless network and
the Internet (GSM/MSC), the CP supports inter-station communication between S7-1200
stations via the master station.
With inter-station communication, the CP establishes a connection to the master station.
The master station forwards the frames to the destination station.
The partners for inter-station communication must already have been created in the
STEP 7 V5 project.
● Direct communication
In dial-up networks and Ethernet networks, there is direct communication between the
subscribers.
14
the RS-232 interface.
Operating Instructions, 02/2018, C79000-G8976-C385-03
CP 1243-8 IRC