Siemens Simatic RTU303xC Series Operating Instructions Manual page 26

Application and functions
1.6 Communications services
Protocols for communication with a master station
Depending on the loaded firmware variant, the RTU supports one of the following protocols
for communication with a master station:
● TeleControl Basic
This is a proprietary protocol of Siemens for telecontrol applications.
The IP-based communications protocol is used to connect the RTU to the application
TCSB. TCSB is installed on a PC in the master station, the telecontrol server. For the
version, see section Scope of delivery, accessories, requirements (Page 39).
Via the OPC-DA or OPC-UA server of TCSB, and OPC client can access the process
data of the RTU. For the TCSB manual, see /4/ (Page 388).
Apart from the RTU, several S7-1200 CPs also support the protocol. It allows especially
energy-saving operation since communications connections are only established
temporarily stop
● SINAUT ST7
The RTU uses the ST7 protocol for communication with a master station TIM.
For communication with a PC application in the master station, the connection must run
via the master station TIM.
When communicating with a TIM module, the RTU uses the transfer protocol "MSCsec"
on the network layer (OSI layer 3). The S7 or MSC protocol cannot be used for
communication with a master station application.
26
Operating Instructions, 06/2019, C79000-G8976-C382-06
RTU303xC